Avoiding voltage drop in LED indicator circuit

Discussion in 'The Projects Forum' started by automatestuff, Apr 12, 2012.

  1. automatestuff

    Thread Starter New Member

    Apr 12, 2012

    I'm designing a simple LED indicator circuit for automated gate components all requiring 24 volts, currents from 0.04 amps to 1.17 amps. All devices are connected to ground all the time and the positive side of the circuit is completed based on the switching of programmable relays. I basically want to have illuminated LED! when the various circuits are at 24 VDC but am worried about the 1-3 VDC drop from the LEDs interfering with device operation. Any suggestions regarding how to potentially deal with this?

  2. wayneh


    Sep 9, 2010
    Hard to guess without a schematic, but in general your indicator LED should be in parallel with any device, not in series with it. The LED needs maybe 15mA to indicate power is on at a location. Choose a resistor to keep the current down.