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ziggypop
modified 12 years ago

Constant current Led driver with two npn

8
3
237
04:40:24
published 12 years ago
ofer
12 years ago
Nice. It uses negative feedback to regulate the current. Simple but effective.
dlynch13
11 years ago
I can remove the bottom transistor while increasing the resistance of the top resistor and get the same effect. Why does this need two transistors?
ziggypop
11 years ago
Dlynch, increase the voltage and you'll see why...

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