How to make an electric screwdriver powered by mains

Table of Contents:

PC power supply

make, electric, screwdriver, powered, mains

An electric screwdriver can be powered by a PC block, which is much easier to find than a new rechargeable battery for the device. The advantage of the PC power supply is the fact that it is possible to obtain various current values ​​at the output, which is considered very important.

The design of the PC power supply has a cooler that provides cooling of the transformer and its constituent elements, so you can immediately note that this type of power supply is durable, and in the next few years you will forget about problems with an electric screwdriver.

Conversion of an electric screwdriver to lithium batteries 18650 14 V

When converting screwdrivers of different power and flashlights from Ni-Cd to Li-ion, batteries of the form factor 18650 are more often used. They easily fit into a container or a nest, since instead of two or three relatives, one lithium is installed. Alteration of the battery of an electric screwdriver should be carried out taking into account the characteristics of lithium batteries for 18650.

This type of energy source does not tolerate deep discharge and excessive charge. Hence, it is necessary to use voltage control boards. Since each battery has its own character, their charge is corrected by a balancer. The point of reworking an electric screwdriver with a voltage of 14.4 V lies in the creation of a device using lithium batteries to facilitate a hand tool and increase its performance. Lithium 18650 batteries are most suitable for these purposes.

When selecting components, it should be taken into account that the starting current of the electric screwdriver is high, you must select the appropriate BMS for the required number of cans and at least 30 A. jumpers.

  • Lithium-ion cans in the amount of 4 pcs.
  • 4-cell li-ion battery controller, CF-4S30A-A works well. It has a built-in balancer that controls the charge of each element.
  • Hot melt glue, flux for soldering TAGS, solder.
  • Heat-resistant tape;
  • Connecting jumpers or thick insulated wire with a cross section of at least 0.75 squares, cut for bridges.

The procedure for converting an electric screwdriver for 18650:

  • Disassemble the case and remove a bundle of 12 Ni-Cd cells from the container.
  • Remove the garland, leaving the connector with the “” and “-” pins. Instead of a temperature sensor, a thermocouple from the controller will be installed.
  • Solder the assembly, considering that you cannot use acid, only neutral flux and pure solder. During the connection period, do not warm up the covers. Work pointwise.
  • Connect the balancing points to the controller according to the diagram. The board has connectors.
  • Connect assembly with plus and minus pins.
  • Check the functionality of the circuit. If everything works, assembled the battery, place the controller in the socket, secure with a sealant.

If the charger is not universal, additional alteration will be required. Screwdrivers for 12 V with a universal charger are assembled in the same way, but a protective connection circuit 3×18650 3.7 V for lithium batteries is used. In the same way, a screwdriver is reworked using a set of 18650 batteries in the amount of 2 elements.

Car battery

The last option is a car battery that can be connected to a screwdriver and used in places where it is impossible to get 220 volts. The disadvantage of such a device is that it will not work for a long time with an electric screwdriver, since the car power source is quickly discharged. Therefore, if the standard UPS of an electric screwdriver refuses to function, which happens very often, then you should not rush to get rid of the device, it is enough to devote a few hours of time and the device will work even better than with a battery.

Old inverter welding

You can power an electric screwdriver using the old inverter welding, but this will require skills in the theory of electrical engineering. Indeed, in this case, it is imperative to add the secondary coil of the transformer, which will make it possible to obtain at the output a completely suitable current to power the electric motor of the device. Therefore, before connecting an electric screwdriver to the welding machine, it is necessary to measure the current and voltage at the output, which must correspond to the values ​​of the device.

Mains power supply for electric screwdriver

Options how to do

If the power supply has also fallen into disrepair, then you should not be upset, since there are other options for how to power an electric screwdriver:

Device mobility

When transferring battery equipment to power supply from the mains, one of the main distinctive properties is lost. mobility. Therefore, if you decide to rework the power of the screwdriver, you need to determine exactly which device you want to use in the future.

There are two concepts of how to convert battery-type equipment into network equipment:

  • The power supply unit (PSU) will be external. This version provides for a separate device. But don’t be intimidated by this, even a heavy and large rectifier can just be near the power outlet. All the same, you will be limited by the length of the power cable either to the outlet or to the power supply unit. According to Ohm’s Law, lowering the voltage at the same power increases the amperage. Therefore, the power cord of the device for 12-19 volts must have a cross section larger than the 220 volt network cable.
  • The power supply is built into the battery case. In such a device, mobility is almost completely preserved, only the length of the network cable can limit the operator’s movement. One problem can arise when you need to install a high power transformer in the battery housing of the screwdriver. But the modern radio engineering industry allows you to solve this problem, there are a large number of compact rectifiers in the radio equipment markets.

Each of the methods finds supporters, since it has a certain set of characteristics.

Which lithium battery to choose?

In 7 out of 10 cases, 12-volt batteries are used for screwdrivers.

The magnitude of the voltage is the determining factor in the selection. It can be specified in the technical documentation for the device, on the Internet. New batteries are selected taking into account:

  • Discharge current value. Screwdrivers operate on batteries with a high discharge current. You can clarify the required parameter for a specific model in the technical documentation. Choosing a battery only by its capacity is a mistake, since the main parameter is the current. It can fluctuate between 15-30 A, sometimes up to 40 A.
  • Characteristics of lithium-ion cells. 18650 batteries must have the same capacity specifications.
  • The number of new batteries. The calculation is easy to perform. The ratio is as follows. 3 Ni-CD is equal to 1 Li-ion. 12-volt old block is replaced with a block of 3 lithium-ion cells.

When calculating the number of new sources, remember that increased voltage (for example, instead of 3 Li-ion instead of 10 Ni-CD, take 4 lithium ones) will increase the wear of the equipment and shorten the service life. But the power will increase. Therefore, you need to weigh the pros and cons. Do not rush to install sources in the instrument. They need to be fully charged initially.

How to convert an electric screwdriver to the network using laptop charging

You can connect a 12 V electric screwdriver to a 220 V network using a laptop charger. It is designed to convert high voltage into low output current up to 19 V. Accordingly, it is possible to use the charging together with a construction unit practically without modifying both parts of the system. You can convert the tool into a network one using the following algorithm:

  • The output cord from the charging is cut off and the end is stripped from insulation.
  • The battery is removed from the electric screwdriver, the discharged batteries are opened and removed, while leaving the terminals in place.
  • Using a soldering iron, attach the bare wires of the charger to the latter. In the process, it is recommended to use a special liquid. the so-called flux. It improves the quality of soldering and also forms a thin protective film on the surface of copper wires that prevents oxidation.
  • Bare connections are insulated with adhesive tape and the cable is released through a hole drilled in the battery compartment.
  • The former battery pack is reassembled and tested for operability as a network.

It is convenient to remake a construction tool using laptop charging, not least because the converter has a compact size and low weight. Unlike a conventional power supply, it will not take up much space on the table and will not make the former battery pack bulky and inconvenient. The converted device can be easily carried in the hands or carried with you in the car.

When using a converted cordless electric screwdriver, make sure that the wire is not pulled too tight

What tools and materials will be required for rework

To convert a cordless device into a network one, you will need to prepare some tools and materials:

  • pliers;
  • several screwdrivers of different sizes;
  • nippers;
  • soldering iron;
  • construction knife;
  • adhesive tape for insulation.

To convert the screwdriver to mains power, you will also need to provide a housing for the converter. A shell from an old battery is quite suitable for this role. it will only need to be slightly altered.

How to make a networked electric screwdriver with a computer power supply

You can connect an electric screwdriver to a 220V network using a computer power supply. Such elements are bulky and large. But their advantages include high reliability, durability and overload protection. You can remake the battery unit for connection to an external mains power source according to the following scheme:

  • Disassemble the computer unit, find the green and black cables on the large square connector, connect them together and insulate.
  • On a smaller connector, remove all wires except yellow and black.
  • The battery is removed from the construction device and the batteries that have exhausted their resource are removed from it.
  • Solder a low voltage cord to the terminal holders inside the battery case.
  • Drill a hole in the battery box to lead the cable out.
  • Connect the latter to the black and yellow wires of the power supply.
  • Isolate all open contacts with adhesive tape.
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After that, it remains to connect a 12 V electric screwdriver to a 220 V network and check if it was possible to remake it correctly.

Usually on the case of the power supply it is indicated which wires in it give a voltage of 12 V

How to convert a cordless electric screwdriver into a network

There are several ways to improve your cordless tool at home. It is not possible to connect an electric screwdriver to a 220 V network directly. It will not be able to work with high output voltage.

To remake a battery device, it will need to be equipped with a power source that provides the required current. In some cases, the element will have to be bought, in others it will only be necessary to slightly improve the part taken from another technique.

How to convert a cordless electric screwdriver into a network with your own hands

Converting an electric screwdriver to mains power is not the most difficult task. There are several ways to improve the tool, only elementary experience in electrical work is required.

How to remake an electric screwdriver using a homemade power supply

If you wish, you can convert the 18V cordless electric screwdriver to 220V mains using a self-assembled converter. This will require some knowledge of electrical engineering and will take more time. But the finished converter will turn out to be quite compact, and it will be possible to install it directly into the body of an electric screwdriver. Thus, during operation, you do not have to constantly monitor the external power supply and control its position.

You can remake a construction tool and install a homemade network converter in it like this:

  • The battery case is disassembled and all elements that have become unusable are removed.
  • In accordance with the finished electrical circuit, a homemade unit is made from purchased parts. For assembly, you need a small board, a transformer and rectifier, a filter and a stabilizer. Elements are securely soldered to the base.
  • Outlet holes for wires are drilled in the battery case.
  • Homemade power supply is inserted into the box and connected to the terminals.
  • The mains wires are led out through the prepared holes.
  • Assemble the body and insert back into the instrument.

When converting an electric screwdriver to power from a power outlet through a homemade block, you need to pay attention to the dimensions of the transformer and other parts. The structure must fit freely in the battery case.

How to convert cordless drill to corded, Black & Decker

When making a power source, you need to use parts that provide a power tool with a power of 300-400 W

Power supply options

To make a 220V network out of a cordless electric screwdriver, it must be borne in mind that the output voltage of the device requires much less. from 12 to 18 V. To re-equip the tool, you will need to equip it with an adapter, or a converter.

There are several options for power sources that allow you to convert the battery unit into a network one:

  • Pulse. Such a power source operates on an inverter system. first it rectifies the input current, and then converts it into high-frequency pulses and transfers it to the instrument either directly or through a transformer. The advantages of a pulsed network element include small dimensions, high efficiency at the level of 98% and short circuit protection. The disadvantage of a switching power supply is low power
  • Transformer. Such a power supply unit consists of several parts. directly a step-down transformer, a rectifier, a stabilizer and a capacitor. Sometimes the system includes a fuse and a high-pass filter to remove the noise. Transformers are powerful enough and inexpensive, but their efficiency is low, and they are bulky

Attention! When using a transformer, it must be borne in mind that part of the output voltage will be taken by the stabilizer. Accordingly, the maximum current value should be slightly higher than the required.

How to assemble a networked electric screwdriver with a Chinese power supply

If a power supply unit from a computer is not at hand, on any radio market you can buy an inexpensive Chinese-made element with an output voltage of 24 V. Before connecting to a cordless screwdriver, the source will only need to be slightly improved so that it can supply a current of up to 18 V. The circuit looks like this:

  • A resistor R10 with a high constant resistance is soldered from the purchased mains power supply and an adjustable element with a maximum limit of 10 kOhm is installed instead. Previously, the value is set no higher than 2300 Ohm, otherwise the construction device will not work.
  • Electricity is supplied to the power source and the current parameters are measured using a multimeter. The adjustable resistor is adjusted so that the output voltage does not exceed 9 A.
  • All internal filling is removed from the battery compartment of the battery device. Using soldering, connect the power supply cable to the contacts inside the tool.
  • A hole is made on the battery case for the wire. The battery is assembled, attached to a screwdriver and a test run of the converted device is carried out.

After removing the batteries from the special compartment, the instrument will become much lighter, but at the same time it will lose balance. To restore it, you can put a small weight inside the empty battery case.

Attention! When using an external transducer, make sure that the length of the wire connecting the instrument to the power source is sufficient, otherwise it will be inconvenient to work.

How to convert an electric screwdriver to work from the mains

Construction work very often involves screwing in self-tapping screws. It is not so easy to carry out such operations manually, as it takes a lot of time and effort. The solution to this problem can be network screwdrivers, which simplify the screwing of self-tapping screws. You can get acquainted with their technical characteristics on the manufacturers’ websites.

Preparatory operations

Cordless screwdrivers very often fail due to battery faults. These devices, if necessary, can be adapted to operate from a conventional electrical network. This process begins with the following preparatory operations:

  • The first step is to find the power supply. It is desirable that it be small. This will allow it to fit into the housing where the electric screwdriver’s battery is located. The power of the power supply must match the parameters of your instrument.
  • After that, take out all the filling from the battery case and leave only an empty frame.
  • The final step is to find out the current consumption. This characteristic is easy to calculate if you know the power.

Getting started

The process of reworking an electric screwdriver can be broken down into the following sequential steps:

  • First, disassemble the power supply and disconnect the standard cord from it. This can be done with a soldering iron. Sometimes the PSU case is held together with glue, so you will need to use a sharp knife.
  • After that, the main structure of the power supply should be placed inside the battery case that you previously took out. It also needs to make holes for the power cord. The cable is inserted through the holes and soldered to the power supply.
  • At this stage, you should already solder the outputs from the power supply to the battery terminals, with the help of which the battery is connected to the electric screwdriver. It is important to observe the correct polarity here. If this is not done, then the instrument may simply burn out.
  • The procedure is completed by assembling an electric screwdriver and checking its operation. It is important here to observe the correct sequence of connection of all elements.

It should be understood that altering such a tool requires certain skills in working with soldering irons and knowledge of electrical processes. Even minimal oversights should not be allowed here. Therefore, it is better to trust such operations only to experienced specialists who guarantee reliable operation of the future device.

Other ways to supply power

On their own

For users with special knowledge and skills, the problem will not be difficult “is it possible to power an electric screwdriver from a charger without special means”, since assembly of the feeding block is possible with your own hands. Instead of damaged elements, a power module assembled according to the scheme is inserted into the case. The outgoing voltage is monitored, the wires are energized, the case is locked.

Tip: the circuit may require additional load, it can be ensured by including a 15W light bulb in the system, which will also provide backlight.

AC adapter for an electric screwdriver in a battery case

If your tool is not too powerful, you can place the power supply in the handle or case from damaged batteries.

We build in a ready-made power supply. To do this, you need to purchase a ready-made block with suitable characteristics and dimensions. There is enough of this kind of stuff on the radio markets. Take the body with you and go to the fitting. When the desired power source is purchased, carefully separate it from the case.

We place an electric screwdriver in a battery box. All components must be securely fastened. If necessary, extend the wires connecting the control board and the transformer. If the circuit touches the metal parts of the transformer during operation, a short circuit will occur.

How to Convert Cordless Drill to Corded

Since the space in the case allows. separate the board and the transformer for better cooling. Whichever quality power supply you choose, the load will be high and overheating is possible.

It will not be superfluous to fix additional radiators on the power control microcircuits. Operate the electric screwdriver for a long time, disconnect it from the mains and touch the radio parts on the control board.

You yourself will understand which elements need heat dissipation. Holes for air circulation can be made in the housing.

Do-it-yourself alteration of the power supply unit will not take much time, and the cost of the purchased module is incomparable with restoring the battery’s performance.

Homemade power scheme. If you are familiar with a soldering iron, this material will come in handy as an instruction. The circuit is implemented on a donor, in the form of a ballast for a 150W halogen floodlight. The added components are indicated on the diagram with colored inserts.

An output transformer from an old computer power supply was added, and Schottky diodes were taken from there. The midpoint of the secondary winding is between a pair of 12 turns each. Since this circuit does not start without load, a 15W incandescent lamp is constantly turned on at the output. At the same time, the illumination circuit is implemented.

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The power supply fits easily into the battery case.

The design turned out to be so successful and inexpensive. that there was an idea to put the production on stream. With an abundance of cheap Chinese screwdrivers, demand will be ensured.

watch the video of reworking an electric screwdriver on a network with a selection of a power supply.

the electric screwdriver is convenient for its ubiquity. independence from limiting wires makes it possible to wade into hard-to-reach areas. A set of two power modules allows you to power one of them while working with the other. However, each battery pack has a finite number of charge / discharge periods, failing once they are used up. In inexpensive tools, blocks break faster, and the user receives a gadget with a working motor, but no power. Then the dilemma arises “is it possible to connect an electric screwdriver directly to the charging”.

You can feed such an electric screwdriver by connecting it to the network through a power supply unit, because its motor operates at 220 volts.

There is a way out. reworking an electric screwdriver into a network

Yes, it loses one of the benefits of a cordless tool. mobility. But for work in rooms with access to a 220 volt network, this is an excellent way out. Especially since you give new life to a broken instrument.

There are two concepts of how to make a network out of a cordless electric screwdriver:

    External power supply. The idea is not as absurd as it might seem. Even a large and heavy buck rectifier can just stand near the outlet. You are equally tied to the power supply, and to the stuck mains plug. And the low-voltage cord can be made of any length;

Accordingly, the 12-19 volt power cord should have a larger cross section than 220 volts.

Car charger

In search of a solution to the question “is it possible to connect an electric screwdriver to a charger”, you can stop at charging with a car AK-block. Modules with manually adjustable current and voltage are applicable. The connection is absolutely not complicated. just connect the input channels of the instrument motor with the contacts of the car charger.

Consider the option with a remote power supply

Using a power supply from a personal computer. On the radio market for a small cost, you can buy an old power supply from a personal computer. We need a version of the “AT” format, which had to be turned off with the key after exiting the operating system.

Experienced users remember such system blocks. The advantage of such a power supply is also that it indicates an honest power. If it says 300W, it means you can safely remove 15-16 amperes from the 12-volt output (again referring to Ohm’s law). This is enough to power the average electric screwdriver.

Such blocks have a power button in the kit. Another advantage is the presence of a cooling fan and an advanced overload protection system. If you will hide the power supply in a beautiful case, do not forget to leave a hole for ventilation.

The connection is very simple. Black wire (-), yellow wire (12V).

Limitations. an electric screwdriver with a supply voltage higher than 14 volts will not work.

Using a car battery charger. The principle is the same as with the use of a computer power supply. It is necessary to purchase an old charger for the starter batteries. The modern fashion for compact impulse chargers has left analog linear devices with manual control of voltage and charge current behind board. Therefore, such a device can be purchased on the automotive market for a symbolic cost.

It’s good if the voltage can be adjusted smoothly. in this case, your makeshift power supply will fit any screwdriver. Converting it to a power tool is reduced to connecting the input of the electric motor to the power terminals of the charger.

Making a homemade power supply. If you are familiar with the principles of building electrical circuits, you can make your own power supply. Scheme giving general concepts. in the illustration.

The transformer can be picked up from an old tube TV, or other household appliances. Power for 220 volts 250-350W. The main thing is the power supply. the donor should not be pulsed.

The voltage on the secondary winding is 24-30 volts. The secondary winding is made from a wire of the corresponding section. However, if the output winding current is at least 15 amperes (see transformer specification), there is nothing to worry about. After losses on the diode bridge (1-1.5 V on the diode), you will get the required output value.

If you have an electrical engineering education, make the calculation yourself. Or in a practical way: by connecting a 220 volt 100W incandescent lamp as a load, measure the output voltage. If it exceeds the needs of an electric screwdriver, reduce the number of turns of the secondary winding of the transformer.

How to convert a 12 volt electric screwdriver to the mains

To make such a device, almost any computer source with a generator on the tl494 chip will do. She has an analogue. This is a k 7500 microcircuit.

A suitable block was found, his generator is made on a tl494 microcircuit. But before proceeding with the alteration, you need to make sure that the unit is working. This requires a 12 volt light bulb and a jumper wire. Each block has such connectors. The red wire is 5 volts, the two black wires are negative wires, and the yellow wire is plus 12 volts.

We connect a car light to a 12 volt mowing line. This will be a kind of load and an indicator that says that the device is working.

There is one more connector. We need a green wire and a black one. We need to close them in order to turn on the block and make sure that it is working. We will do this using a wire jumper. We connect 220 volts and close the green and black wires. As you can see, the fan spun, the light came on. This suggests that the unit is working and can be redone.

Let’s disassemble the circuit and redo the connection of the tl494 chip, as shown in the diagram in the magazine article Radio, 2009, p. 38. “Computer power supply. charger.” This magazine can be easily downloaded on the Internet. We do not need the whole circuit, but we need a node responsible for connecting the microcircuit. The alteration in our case should be done in the same way as in this part of the circuit. We do to remove all protections from the unit and allow the generator to work so that the unit works immediately and does not turn off under load.

After the alteration of the circuit’s communications is done, we connect the power cord and connect it. And the power supply should start working immediately, and the 12-volt bulb should light up. All protections are disabled, the generator is allowed to run. After that, all the wires that go to the block are soldered onto a 12 volt mowing line. This is not enough for us to work with an electric screwdriver, we need to raise the voltage to 16 Volts for a power reserve. At the output of the circuit there is a 16 volt electrolytic filter capacitor. You need to unsolder it and put a capacitor at 25 volts, since we will raise the voltage to 16 volts and the previously installed capacitor will not withstand.

In the power supply circuit, there may be a resistor for other parameters, but you should put a 3 kilo-ohm resistor. It is also necessary to replace the section of the circuits in the block that goes to the 12 volt mowing line. Next, we connect a multimeter to the mowing line while the unit is running and, using a variable resistor, increase the voltage to 16 volts. After that, the alteration can be considered almost complete. A wire must be soldered to a 12 volt mowing line, you can bring out indicators, switches.

Valery Odinets A year ago And I have a dead professional Hitchi. I tried to power it directly from my own charging. it is SMART, GAD, does not want to! The native charger does not see the proper load, and is cut off. I had to put dead batteries in the buffer at the exit. Result. I endlessly work from the network, then 5 minutes on dead cumulators. Not very mobile, but free. And Hitachi-Pro is a beast, even with swotting.

Do-it-yourself rework of a cordless electric screwdriver in a network

The third option is to convert the cordless screwdriver for mains operation. You will need knowledge of electronics and circuitry, so this is not for everyone. In addition, you will need to know the operating parameters of your battery.

If the battery is broken, then you can ask people on the DIY forums to measure the parameters of the current and voltage of the battery. This will help you make the mains power supply. Basically, if you have a good knowledge of electronics, you can simply disassemble the battery. In its design, there will be chemical batteries connected in a certain way. Knowing their type, from the name of the battery, as well as the connection diagram, you can quickly estimate the parameters of the battery. And then assemble the rectifier with the required operating parameters. Or even replace the cells in a failed battery. And then you don’t have to assemble the rectifier.

Just a networked electric screwdriver

A more expensive screwdriver is a specialized network. Such a tool has a built-in gearbox, most often of the planetary type.

They are positioned as a professional tool and cost significantly more.

How to make an electric screwdriver from the mains

The mains screwdriver is the dream of many DIYers. In principle, it happens that in a home workshop there is no need for a cordless tool. You can have access to the outlet at any time. Of course, it is convenient to have a cordless screwdriver in your hands. But when you work, you hold in your hands, in addition to the tool itself, also a battery. And it will be harder.

Also, batteries often break, break. And since on sale you are unlikely to buy a battery separately from a screwdriver, you have to puzzle over how you can provide your screwdriver with the necessary power from the outlet, bypassing battery devices.

Replacing an electric screwdriver with a conventional drill

The easiest option is to use an ordinary small drill as a screwdriver. You just take a bit and clamp it into a chuck instead of a drill. Working with a drill as a screwdriver will require some skill. The fact is that the drill does not have a “ratchet”. in a screwdriver, the ratchet will work as a safety catch when the fasteners are tightened. Therefore, you need to clearly feel this moment and release the button. Otherwise, torn off screw heads, spoiled bits and a mood are guaranteed to you. Another difference between a drill and a screwdriver is the rotation speed.

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If the torque is small in the drill and the rotational speed is high, then in the screwdriver it is the other way around. Some even have the ability to adjust the rotation speed. Without a high torque, tightening a large self-tapping screw is unlikely to work. you will have to resort to using a screwdriver. Therefore, small screws are usually screwed in with a drill.

It is not recommended to use a hammer drill as a screwdriver, although its operating parameters of torque and rotation are more acceptable. The hammer drill has a large radial runout, with its help it is difficult to tighten the self-tapping screws.

Benefits of cordless screwdrivers

Cordless screwdrivers are very convenient on the construction site. it is very easy to work with them on the roof, in difficult conditions, where dragging wires will only get in the way and create unnecessary danger. But this is where the battery breaks down most often. the screwdriver fell, the battery broke, and you have to look for a new one.

Let’s figure out how to make a screwdriver from the network.

Converting an electric screwdriver to mains power: 5 ways

The value of an electric screwdriver as a home or construction tool, most often, lies in its portability. However, due to certain circumstances, portability sometimes has to be abandoned in favor of functionality. It is about converting a cordless electric screwdriver into a mainspowered tool. This process has a number of subtleties that it is advisable to observe.

Power supplies from computers are distinguished by their durability, advanced overload protection and a host of other advantages. They may not be very convenient due to their size, but a long wire will help solve this problem.

The procedure for connecting the computer power supply to the screwdriver:

  • disassemble the block;
  • remove the protection against switching on by disconnecting the green wire from the board;
  • this wire must be connected to the black connector on the device;
  • separate all wires except yellow and black;
  • these two wires are soldered to the extension cable;
  • the second end of the cable is directly connected to the screwdriver;
  • all open contacts are isolated if possible.

Thus, a power supply unit for a 14 volt electric screwdriver will turn out from a computer device.

Required materials and tools

Materials and tools when reworking an electric screwdriver completely depend on the type of tool and the type of power source, as well as its features. But to summarize, there are several main tools:

  • screwdrivers;
  • pliers;
  • knife;
  • insulating materials;
  • cable for supplying electricity;
  • soldering iron and soldering materials;
  • any case for the future power supply.

Alteration of the power supply unit made in China

Excellent for creating a power supply for a 12 volt electric screwdriver with your own hands, ordinary Chinese power supplies with an output voltage of 24 V and a current of 9 A. But since the tools use less voltage, you must first lower it.

To achieve the goal, you need to replace the original resistor R10 with an adjustable resistor, with which you can achieve the desired voltage. This is done in several stages:

  • a constant resistor is removed;
  • in its place, a previously prepared adjustable resistor is inserted, on which a resistance of 2300 ohms will be set;
  • so far, the voltage is still 24 V;
  • using the resistor settings, you need to achieve the required voltage on the contacts.

After all the manipulations, you need to check that the output voltage is the required value (12 V, 14 V, etc.), and also that the current exceeds 9 A.


The principle of operation of pulse systems is that the voltage is first rectified and then converted into a special pulse signal. In this case, it is important to achieve a stable voltage. This can be helped by a transformer winding or resistors.

Switching power supplies are quite effective and can be used in different conditions. At the same time, they have a high level of protection against short circuits and similar effects. However, in terms of power, impulse systems are clearly inferior to transformer ones. In addition, such units are very capricious to the input voltage. If it is lower than the set, then the element may simply not work.

Alteration of purchased blocks

It can also be powered from any other commercially available power supplies. The alteration process in this case will be almost the same, however, in addition to the resistor, you may need to solder additional diodes. The most important thing is to achieve the required output parameters. And this can be easily done using a combination of components.

Required tools


    A networked electric screwdriver. what is the advantage of such an assistant? Choosing a networked electric screwdriver. what to look for? How to safely use an electric screwdriver from the mains? How to make an electric screwdriver. mastering an electrician

DIY screwdriver from the network

Benefits of cordless screwdrivers

Cordless screwdrivers are very convenient on the construction site. it is very easy to work with them on the roof, in difficult conditions, where dragging wires will only get in the way and create unnecessary danger. But this is where the battery breaks down most often. the screwdriver fell, the battery broke, and you have to look for a new one.

Let’s figure out how to make a screwdriver from the network.

Just a networked electric screwdriver

A more expensive screwdriver is a specialized network. Such a tool has a built-in gearbox, most often of the planetary type.

They are positioned as a professional tool and cost significantly more.

1 A networked electric screwdriver. what is the plus of such an assistant?

At the moment when a novice craftsman, in pursuit of convenience, prefers to buy a cordless drill-electric screwdriver, the network analogue is gathering dust on the shelves further. Loud and colorful advertisements promising a long service life of new generation batteries make you not think about physics. Although everyone who knows even a glimpse of an electrician will think about the veracity of these words. In the meantime, very soon disappointment comes, sometimes due to the fault of the master, sometimes due to an accidental coincidence, the cordless tool does not work, which makes the person frantically look for a new spare part or adjust the power supply of the electric screwdriver from the mains.

Why is this happening? It should be noted the obvious advantages of the battery-powered tool. It has small dimensions and weight, is mobile, which means it can work away from power sources, allows you to get and carry out fasteners in the most inaccessible places. But what darkens this picture? Batteries require special care, regular use and subsequent charging, are capricious to storage conditions, quickly exhale, and charge several times longer than they can work. Many unpleasant surprises await us from this.

At first we can happily make repairs. But over time, we will become uncomfortable with long hours of charging. The solution may be to purchase two batteries, but this will save us for a while. If you do not work with the tool all the time, then after a prolonged inactivity, the battery will lose its capacity, it will discharge faster, and it will not be able to fully charge. If you carelessly store such food, then you can even find a swollen or leaking battery that cannot be used. We also note their high cost when purchased separately.

Radio engineering, electronics and diy circuits Power supply for a cordless screwdriver from a 220 volt network

Screwdriver. it is a very useful tool, it can be drilled, screwed and even threaded. All the screwdrivers that I saw were rechargeable, which gave great autonomy, you can work where there is no outlet. Usually there are two nickel-cadmium batteries included. But their resource is relatively short-lived and after a year the capacity drops dramatically due to damage to individual cans.

Batteries have to be charged constantly, every time before work, and they only last for half an hour or less. Therefore, I decided to assemble a power supply unit from a 220 volt outlet to a screwdriver.

An electronic ballast for halogen with a power of 160W was chosen as the basis for the power supply. It is a half-bridge self-oscillator on two MJE13009 transistors.

This power supply has a current feedback, for this reason, at least it will not start without load. Taking this fact into account, a 15W incandescent lamp was connected in parallel to the output. Its function. recognize the minimum load for the power supply and illuminate the drilling work area.

The problem of starting an electronic transformer can also be solved by redoing the feedback of the oscillator from the current to the OS in terms of voltage. To do this, they take it not from a small ring, but from an output transformer. But in this case, the priority was the ease of rework.

The power supply board is housed in the battery case. Its voltage is 16.8 volts. Battery capacity is 1200mA / H.

Output transformer. toroidal, made on an annular magnetic circuit. Initially, the secondary winding was wound with a litz wire from several wires in heat shrinkage and contained 8 turns. The new winding was wound with a thick wire, 2 x 12 turns, to get the midpoint. The terminals of the transformer are connected to an assembly of two Schottky diodes from the power supply unit of the computer (in the photo it is on the radiator). The rectifier output is connected to a choke on the ring, from the computer’s motherboard. The electrolytic capacitor at the output has a capacity of 4700 μF, it is shunted with a 0.1 μF ceramic capacitor. To remove the ripple with the mains frequency after the rectifier at the input of the electronic ballast, an electrolytic capacitor with a capacity of 220 μF is added.

The added elements are shown in green on the diagram.

The described revision of the screwdriver made it possible to power it directly from the 220 volt network. A 7 Ohm thermistor is installed in the 220 Volt power circuit break, which smooths out the current inrush at the moment of switching on.

How to make an electric screwdriver from the mains

admin. 06.02.

The mains screwdriver is the dream of many DIYers. In principle, it happens that in a home workshop there is no need for a cordless tool. You can have access to the outlet at any time. Of course, it is convenient to have a cordless screwdriver in your hands. But when you work, you hold in your hands, in addition to the tool itself, also a battery. And it will be harder.

Also, batteries often break, break. And since on sale you are unlikely to buy a battery separately from a screwdriver, you have to puzzle over how you can provide your screwdriver with the necessary power from the outlet, bypassing battery devices.