timing cicuits

Discussion in 'General Electronics Chat' started by gani775, Jan 31, 2012.

  1. gani775

    Thread Starter New Member

    Jan 19, 2012
    My intension is to switch off starter motor after 10seconds of engine start..
    i want an device/circuit which counts for 10seconds and then produce an output in the form of current/voltage, so that an relay can be made off..which in turn turns off motor.
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
  3. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    what happens if you loose your voltage/current releasing the relay and your starter motor kicks back in when your engine is running? If your talking auto, your starter will be destroyed with 10 second engagements.
  4. gani775

    Thread Starter New Member

    Jan 19, 2012
    Once starter motor turns on, after 10seconds it should turn off, we should use some of the timing circuits(passive devices).. using this timing circuit output we should cut off the relay(relay which in turn offs the starter motor).
  5. JCOX


    Nov 29, 2011
    If you're talking automotive, are you wanting the starter motor to not engage once the engine is running? if so, modern vehicles do this with a starter safety switch or a solenoid that cuts current to the S terminal once the engine has started, by either detecting oil pressure, a signal from the alternator or even fuel pressure to open the circuit. what's wrong with using a starter safety switch?