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Thread: How to build a very simple delayed power oft circuit?

  1. #31
    FLAC
    Join Date
    Sep 2004
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    1,577
    Quote Originally Posted by Curiosity
    Also, the relay needs a clamping diode. I found out what that can do if it's not there. When the PC is off and you turn the key off, it closes the relay for about 1 second and starts the PC up. Not good.
    Hmm. I might be able to use that effect to generate a momentary at power off. I see that the capacitor in your circuit can discharge through the other relay thus drawing current through the 'momentary' relay (unless the diode is present) and triggering a 'click'. It's not really a clamping diode as such then.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  2. #32
    What can I say? I like serial. Curiosity's Avatar
    Join Date
    Mar 2004
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    D'Oh! The other relay! Maybe that's where the power was coming from? Well, I did manage to fix it at least.

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