Lousy 'constant' current source
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Lousy 'constant' current source
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
en.wikipedia.org/wiki/Current_source
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