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Led fwd vtg is 9-10V and current 1A.
What about the simulation I posted in #2 did you not understand?I have found this constant current circuit from a blog. Without the transistor in the dotted box. My question was Can I switch this led by adding that "dotted box transistor". Will this affect the const current circuit or whole circuit will overcurrent the led.
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And no I didn't understand the simulation. Sorry for that. Can you plz explain.