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Thread: Delay PSON signal

  1. #1
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    Delay PSON signal

    How can you delay the poweron signal that goes to the motherboard by a slight amount - eg. 0.5 sec or even less??? Want as simple circuit as possible.

    I am using an ITPS with an inverter and I need to delay the PSON signal so that it gives enough time for the inverter to turn on.

    Any ideas appreciated.

  2. #2
    Maximum Bitrate SAScooby's Avatar
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    try a slow relay ?

    seriously

    you could set up the invertor to work on the c/locking or door open sequence and then by the time you are in the drivers seat and turning the key on, then there is no need for a delay

    This I think is the biggest stumbling block so far to using an inverter (you can get around it with a small UPS)
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  3. #3
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    The reason why I have the Inverter setup to run via relay off ITPS is so that it continues to stay on after I have taken out my key. I cannot wire it to ignition because of the above - I cannot wire it to door because of the above.

    Slow relay - do you have any more information??

  4. #4
    Maximum Bitrate SAScooby's Avatar
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    well most relays switch in 5 or 8 msecs so you will need to build some type of capacitive store, that takes a set time to build before allowing the relay to make contact, difficult and probably not effective in your case, I do suggest you try http://www.davidnavone.com he makes awesome "bits" for car sound and I am sure he has a "turn on delay device" with settable delays
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  5. #5
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    I am in Australia and don't really see the need for a device costing over $10. I was thinking it would just be as simple as a capacitor and resistor or something like that...

  6. #6
    Maximum Bitrate SAScooby's Avatar
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    I am no electrics whizz, but I am sure there are kits out there that do this easily and simply, try our good friend google and see what it throws up, also visit your local newsagent and pick up an electronics magazine, they often have very good websites with download for free kits etc with parts lists and so on
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  7. #7
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    yeah...been doing a heap of searching around - the forums..googling..there are stuff...but usually quite expensive and complicated - I was hoping it was as easy as a couple of components.

  8. #8
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    If all else fails - I will probably end up using a couple of relays which will give me a delay of say 50ms...hopefully should be enough...

  9. #9
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    You could use a RC circuit to trigger it. The forumula is .. Time = Resistance x Capacitance. The capacitor will be charged 63.2% after this amount of time.

    So if you had a 9V relay, a 12V power source, a 5k ohm (5000 ohm) resistor, and a 100 MFD (micro farad or .0001 F ) capacitor, the relay would switch on after 1/2 a second.

    The only problem is that the relay would switch back off after about 2 seconds, and the process would repeat. I've seen relays called latching relays.. and I would assume that they would stay on after being switched on, but I have never used them.

    But anyway .. there you go... a 5k ohm resistor and a 100mfd capacator will give you a .5s time constant. Can someone take it from here?

  10. #10
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    Why would it repeat itself?

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