momentary break in power

Discussion in 'General Electronics Chat' started by madmike, Aug 11, 2010.

  1. madmike

    Thread Starter New Member

    Aug 11, 2010
    Hi I am looking for a circuit that when i switch my ignition on it (12v/24v) it will momentary disrupt power to my tracking unit and then restore power to it I need a circuit with a small component count and no relays if possible has anybody got a circuit like this at all

    Thanks Mike
  2. timrobbins

    Active Member

    Aug 29, 2009
    What is the current requirement of the 12V connection to your equipment? Is there an inrush current when power is reconnected?
  3. Potato Pudding

    Well-Known Member

    Jun 11, 2010
    Do you really need it shut down or would an input power filter be enough?

    If you need it shut down and it has a low power requirement then an active T filter plus 10 Volt Zener to the igniton line.


    When you turn on the starter crank the transistor drops the power to your module.

    The 68 ohm resistor will take some voltage all the time. If your module draws more than 10mA this is not a good solution but it might work upto about 25 mA where it would drop around 1.5 Volts.
  4. madmike

    Thread Starter New Member

    Aug 11, 2010
    Hi Tim
    It has a very small current consumption negligable and there is no inrush of current when switched back on