From a broken charger: Mini converter from 1.5 V to 220 V

If you have a broken cell phone charger lying around idle, then you can use it to make one small but necessary homemade product. This is a simple voltage converter from constant 1.5 Volts to variable 220 Volts. The diagram is truly elementary and contains only 3 parts.

Manufacturing a mini voltage converter

We disassemble the charger housing and remove the board from there.

We solder the transformer from this board.

Converter circuit

As already mentioned, the scheme is the simplest. Before assembling it, you need to “ring” the transformer with a tester and find out the resistance of each winding. There should be three of them in total. Naturally, the resistance of the windings of your transformer may differ slightly - this is not a big deal. But if the discrepancies are dramatic, then such an instance may not be suitable.
We assemble the converter according to the diagram.

The circuit uses a “2SD882” transistor; it can be replaced by any low-frequency “p-n-p” medium-power structure. Or the domestic analogue KT815, KT817.
Everything is assembled by hanging installation without a fee in 5 minutes. Solder the wires from the light bulb socket and from the battery.

The device works immediately when turned on and does not require configuration. If generation does not start when you first turn it on, swap the contacts of one of the low-voltage windings.
A 220 V LED lamp with a power of 3 W was used as a load.

The operating frequency of the converter is about 25 kHz.
If you power the circuit with 3 Volts, the brightness of the lamp will increase and it will definitely shine at full power.

You can connect another charger as a load and charge your mobile phone from the batteries.

Watch the video