2 flashing lights from an old phone charger

Surely you have this tangle of chargers for various cell phone models in one of your closets at home. They are all working and therefore it would be a shame to throw them away...
Chargers can be used to make useful devices out of them. Here are two of them that even beginner radio amateurs can do.

LED flasher

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

Find on it such an element called an optocoupler. And, we solder it.

This is what its pinout looks like.

We take a capacitor from the same board or a larger capacity and solder it to pins 1 and 3 of the optocoupler.

We solder a 2.2 kOhm resistor, also soldered from the charger.

Solder a 6.8 kOhm resistor.

And at the end we seal it Light-emitting diode.

The flasher is ready.

We supply power from 3.6 V batteries.

Everything flashes fine.

Flasher on a neon lamp powered by 220V

This flasher is good because it runs on 220V AC mains.
Let's take and disassemble the block body. Let's take out the board.

We will remove the high-voltage capacitor from it.

At the same time we solder the neon to it.

Next, we’ll solder the diode; it’s definitely on the charging board.

And a resistor with a nominal value of 500 kOhm - 1 MOhm.

Connect to the network.

Everything works great.

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