.:madworm:.'s photos with the keyword: 2N2222A

Lousy 'constant' current source

Lousy 'constant' current source

.:madworm:.
19 Jun 2011 173
Not really a constant current source. At least not really independent of supply voltage. With the addition of a Zener diode it could be improved a bit. A 2 transistor variant would be better. Or just buy an LM317 straight away. en.wikipedia.org/wiki/Current_source