Hello guys) we will collect the bank from the trash can say) these details are in the bins of almost every radio amateur! This scheme from aka kasyana, liked the simplicity. We will repeat and test it)
And here is our scheme
it is made on a multivibrator, transistors can be used at least kt 315. And the power component kt 829. The voltage here is stabilized!
We etch the board
We solder all small radio components, i.e. resistors from the beginning! 2 ceramic capacitors. 3 transistors 2n5551 series
5.1V zener diode, 2 high-speed diodes. Power transistor and throttle wound on a dumbbell. You can also use a powder iron ring! The number of turns 25 with a diameter of 0.5-0.8.
We check its idle current, I got 40-50 mA - this is of course a lot.
We measure the output voltage, we obtain an output of 5.5 V idling.
Well, let's torment him with an incandescent lamp, I have it at 24 V, but it doesn’t matter. We look at the voltage drop, and it turns out 250 mV. And the current consumption is almost 1.5A.
And finally, let's try to connect to the phone! And as we see the phone began to charge)
At the same time, there is a noticeable heating of the power transistor, so it needs to be planted on a radiator in the form of an aluminum plate. In the future, insert it into some sort of building, bring it to mind!
Link to the archive with the printed circuit board