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1/60 f/5.6 10.2 mm ISO 80

PENTAX Corporation PENTAX Optio S5z

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resistor
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2N2222A


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Lousy 'constant' current source

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

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