Power Supply Screwdriver
The value of a screwdriver as a home or building tool, most often, lies in its portability. However, due to various circumstances, portability sometimes has to be abandoned in favor of functionality. We are talking about reworking a cordless screwdriver into a power tool. This process has a number of subtleties that it is desirable to observe.
Power Supply Options
Any screwdriver requires much less voltage than a conventional outlet. Therefore, to make sure you will definitely need a special converter, the output of which will get the necessary voltage. All power supplies are divided into two large groups: switching and transformer. Let’s consider each of them separately.
The principle of operation of pulsed systems is that the voltage is first rectified, and then converted into a special pulse signal. It is important to achieve a stable voltage. A transformer winding or resistors can help with this.
Switching power supplies are quite effective and can be used in different conditions. over, 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 blocks are very moody to the input voltage. If it is lower than the set, then the element may simply not work.
common power supplies that have proven their reliability and effectiveness in many areas. The device consists of a step-down transformer and a rectifier, through which a reduced voltage passes. Rectifiers can be different, depending on the number of diodes used.
Such elements are easy to manufacture, cheap and reliable. Therefore, it is often they who are preferred. They provide stable voltage without interference with high maximum power. But there are several drawbacks. The main disadvantage is cumbersome, with much lower efficiency than pulsed sources. This fact requires selecting a power supply for a screwdriver with a power greater than that required by the tool. Since part of the capacity will be spent on side processes.
Necessary materials and tools
Materials and tools for remodeling a screwdriver completely depend on the type of tool and type of power source, as well as its features. But to summarize, we can distinguish several basic tools:
- insulating materials;
- cable for supplying electricity;
- soldering iron and materials for soldering;
- any case for the future power supply.
How to do it yourself
Before remodeling a screwdriver, it is necessary to clearly determine what power and what voltage the tool needs to work. From this it will be necessary to proceed.
Then the tool body opens. Two halves of the body can be fastened with screws or with glue. When disassembling, a knife can be very useful.
After opening the case, a power supply or wire is inserted inside, the contacts of which must be soldered to the charger. Soldering should be as efficient as possible, using special solutions.
The second end of the wire should be designed to be powered from the network. So there should be a plug. It is recommended that you make a hole in the housing through which the cable will pass.
Видео: Power Supply Screwdriver
Homemade power supply can be obtained in several ways. In any case, you will get a full-fledged tool with which you can perform work after connecting to the network. It is advisable to pre-prepare a diagram that will help you not make a mistake when creating the block.
Alteration of the Chinese-made power supply
Great for creating a power supply for a 12-volt screwdriver with your own hands, ordinary Chinese power supplies with an output voltage of 24 V and a current of 9 A are suitable. But since the tools use a lower voltage, it is necessary to lower it first.
To achieve the goal, you need to replace the original resistor R10 with a custom resistor, with which you can achieve the desired voltage. This is done in several stages:
- a constant resistor is removed;
- in its place is inserted a pre-prepared adjustable resistor on which a resistance of 2300 Ohms will be set;
- so far, the voltage is also 24 V;
- Using the resistor settings, you need to achieve the necessary voltage on the contacts.
After all the manipulations, you need to check that the output voltage is the right amount (12 V, 14 V, etc.), and also that the current exceeds 9 A.
Alteration of purchased blocks
You can also power off any other purchased power supplies. The alteration process in this case will be almost the same, however, in addition to the resistor, it may be necessary to solder additional diodes. The most important thing is to achieve the necessary output parameters. And this can easily be done with a combination of components.
We use charging from a laptop
A great option is the use of charging from a laptop. Such devices usually work with voltages from 12 to 19 V. This is quite enough to ensure the quality of the work of a screwdriver. But do not neglect the output current indicators. The closer it is to the required, the better.
In this case, the alteration of a screwdriver powered by the mains is reduced to elementary soldering of wires from the charger to the board in the tool. It is advisable to isolate everything with electrical tape or other similar materials. After that, the wire is brought out and the tool can be used.
Computer power supply
You can make a screwdriver from the network using an unnecessary power supply from a computer. There are many varieties of such devices, but almost all of them are suitable for a screwdriver. The necessary wires can be found by color by checking the manufacturer’s website.
Power supplies from computers are characterized by durability, advanced protection against overloads and many other advantages. They may not be very convenient because of their size, but a long wire will help solve this problem.
Procedure for connecting a computer power supply to a screwdriver:
- disassemble the block;
- remove protection from turning 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 whenever possible.
Thus, a power supply for a 14 volt screwdriver will be obtained from a computer device.
Powered by car charger
Power supplies converted from battery chargers for car batteries are still fairly common. The principle of alteration here is about the same as that of a computer power supply, but there are several features.
The main feature is that usually such devices make it easy to adjust the voltage and current. This greatly simplifies the procedure for use, and also allows you to apply the method to all screwdrivers.
Using car chargers boils down to a few simple steps:
- you need to prepare special wires that will connect the power supply and a screwdriver;
- the edges of the wire are stripped and inserted into the terminals on the tool (for better retention, you can use clamps);
- when connecting, it is necessary to observe the polarity, which is usually indicated on the mounts or the wires themselves;
- now all joints are carefully strengthened and isolated.
After all these procedures, the user will receive a functional screwdriver that is able to work from a 220 volt network.
All of these methods are effective enough to create a network tool from a cordless one. But do not forget that in this case, the mobility of the screwdriver will significantly decrease, which can affect the quality of work. But if the battery is out of order, and the work needs to be urgently continued, it is logical to connect external power sources.