How to lower the voltage from 5v to 4.2v?

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Vladimir Semyonov2014-10-23 06:24:55

Iron

Vladimir Semyonov, 2014-10-23 06:24:55

Ruined the charger, in an attempt to fix it. The output voltage is 4.2V. There is no special access to components, such as controllers, since I am out of town. Is it possible to make some adapter that will fulfill this requirement?

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5 answer(s)

B

brutal_lobster, 2014-10-23
@warpedobsession

And what of the elements is on hand?
You can use the poke method to assemble a voltage divider from resistors and capacitors

O

Ocelot, 2014-10-23
@Ocelot

Plug 1-2 diodes in series. Each will drop 0.4-0.6V.

A

Alexander Bukhalo, 2014-10-23
@donbot

Stick in a sausage

C

Cyril, 2014-10-23
@pt1c

Since the question here is about 0.8 volts, I would advise the DC-DC Step Down Converter based on the LM2587, since it can be fine-tuned. I also advise you to buy ready-made, since you can order it for very little money in China. Search for "LM2587 Step Down".

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Vitaly, 2014-10-23
@vipuhoff

if you use a minimum of components, then you can make it on the simplest 1 transistor and 1 resistor, there are a lot of circuits on the Internet.