current limiter

Discussion in 'General Electronics Chat' started by Skubby SkinnyChubby, Jun 26, 2015.

  1. Skubby SkinnyChubby

    Thread Starter New Member

    Jun 19, 2015
    25
    1
    satyapal likes this.
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,797
    1,103
    Increase R1 to 1 Ohm. Adjust the pot U1 to set the 1A limit.
    When the voltage tapped off at the pot wiper produces >0.6V between Q1 base and emitter, Q1 turns on and pulls the gate of M1 high, tending to turn it off.
     
    Skubby SkinnyChubby likes this.
  3. crutschow

    Expert

    Mar 14, 2008
    13,004
    3,232
    Note that as the P-MOSFET gate-source voltage difference is reduced (Vgate becomes higher) it starts to turn off.
     
    Skubby SkinnyChubby likes this.
Loading...