Constant current with 2 type

168

02:17:34

Easy and low cost constant current. U can see the led current will keep current when change from 12v to any larger voltage. 1. using zener to handle BJT. BJT Beta=100 Rb=(12-5)/(20mA/100)=3.1Kom Re=(5-0.7)/20mA=220om   2. using BJT handle MOSFET.

published 10 years ago

rich11292000

10 years ago

I like

mehmet1989

10 years ago

And it is also a voltage regulator circuit if you take the voltage from the Emitter.it is a constant voltage that is Vzener - 0.6V

xxlinxx

10 years ago

Yea, this can be install on motocycle or cars LED when voltage isnt stable.

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