Materials (all parts in a single copy):
– Bipolar transistor NPN structure.
– Bipolar transistor PNP structure.
– Choke inductance from 100 mH to 470 mH.
– 750 ohm resistor.
– 100 k ohm resistor.
– 220 kOhm resistor.
– Electrolytic capacitor with a capacity of 100 uF.
– Foil-clad textolite.
– Ferric chloride.
– Soldering iron
– Drilling device.
– Straight arms.
Diagram and principle of operation.
The figure below shows a schematic diagram of the device.
The author used a light-emitting diode as a load.
According to him, the ratings are not critical, their change is acceptable within 10-15 percent.
R1 – 750 Om
R2 – 220 kOm
R3 – 100 kOm
The principle of operation is that electricity is supplied to the choke, and then disconnected from it. Since the choke is a coil, a magnetic field appears, which saturates the choke when the choke is turned off, and the result is a much higher voltage. The electricity is then equalized through the diode and stored in the capacitor. The maximum possible output voltage depends on the maximum allowable capacitor voltage. In order not to accidentally burn something (without connecting the load, the capacitor is charged to the maximum possible voltage, and it can reach tens and hundreds of volts), it is very desirable to put a voltage regulator after the capacitor (if the consumed load current is small, then you can limit yourself to a zener diode, otherwise, you need to use the LM317 circuit, which is attached below).
Printed circuit board.
The author has kindly provided a PCB template, according to which you can cut the tracks on the PCB with a knife or very successfully create your own in the Layout program with subsequent production by etching.
When you have prepared the board and parts, all that remains is to solder everything into place.
The tracks on the board must be tinned; during soldering, do not overheat the parts, especially semiconductor components, excess temperature can bring them out of working condition. If you put everything together correctly, then the circuit does not need to be adjusted.
For “pumping” the converter, you can supply a more powerful choke with increased permissible current and powerful transistors, which can be taken not only bipolar, but also field-effect (NPN replace with N-channel and PNP, respectively, with P- channel). If you do this modification, do not forget to put the power elements on the radiators.
There are a great many applications for this device, so its assembly will not be a waste of time. The photo shows the device that was created by the author.
This concludes my article, the original can be found at the link below.