Would this resistor be too low?

Discussion in 'General Electronics Chat' started by dubeeyubee, Aug 27, 2014.

  1. dubeeyubee

    Thread Starter New Member

    Aug 27, 2014
    1
    0
    Hi there! I'll get to the point, im using 12 LEDS in parallel, supply voltage is 5V, forward voltage is 3 volts, and 20 Milliamps is the desired current. So, would a 3.9 resistor be too low if its all i have? or would it be okay if the circuit is on for long periods of time.
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,282
    1,233
    you need 100 ohms in series with each one or they will smoke.:(
     
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