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Li-Ion cell charger with (too) simple design. With schematic. Charges to 4.45V!
A very simple Li-Ion battery charger from China. It contains a very simple 2-transistor switching power supply and a voltage regulation with just a Zener diode. There's also an indication circuitry to indicate charging / fully charged using a red / green LED. This is done using only a 3-pin LED and resistors, without any active components. This power supply has no fuse and a questionable mains separation, so it may be dangerous The output voltage is very poorly regulated and in this case it was 4.45V, enough to make a Li-Ion battery catch fire or explode.
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