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Thread: Power supply Help

  1. #1
    Registered User
    Join Date
    Sep 2001
    Location
    Los Angeles
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    8

    Post Power supply Help

    Hi All,

    I built the sproggy unit, with out the delay good signal, since I believed my unit was non-atx. Well, it is kinda strange. It looks like the unit needs a delayed -12 signal. I am looking for a small circuit, such as an RC circuit, with a relay, so that I can get the delay into the -12 volt line. I want to use a pot, so that I can adjust the timing. If anyone can help, or has any ideas, please let me know, or, please post it here.

    Thanx
    Mike

  2. #2
    Newbie
    Join Date
    Jul 2001
    Posts
    4

    Post

    Really??
    how did you test this??
    and are you sure that you made the power supply right???
    You could probably just adapt the power good circuit used with sproggys supply to give a -12volt power good signal, and the ability to adjust the time..

  3. #3
    Registered User
    Join Date
    Sep 2001
    Location
    Los Angeles
    Posts
    8

    Post

    Really.

    I tested, just not sure what you are asking me when you ask "How did you test THIS?".

    The PS is fine, I TESTED that with my trusty old Volt Meter, all the voltages are correct. The unit has an on-off button, and on shutdown, I get the TURN OF COMPUTER message, it doesn't do it automatically. I connected the Power Supply, and everything spins, but no post. I originally thought I need a power good signal. So I broke the +5 volt rail, and added my own power good signal, by connecting the wires, a second or so after power on, NO DICE. I then checked the original supply, and noticed that the-12 volt takes a second to come on, after the others are already on. (Of course I checked the orignal PS before that, but only to get the connector pin out, and to check to see which voltages I needed, and where) I then broke that connection, and manually made the connection about a second later, and voila, it posted, and booted. I fooled a little with the timing, and it looks like the timing is critical.

    So, I hope I answered your questions, even though they were a little vague. And yes, the sproggy design could be moded, but I don't have the knowledge, that is why I posted the message to the board. CAN YOU HELP???

  4. #4
    Variable Bitrate
    Join Date
    Jul 2000
    Location
    Ottawa, Canada
    Posts
    422

    Post

    sproggys supply uses a CMOS 4049(?) chip to do the PG signal timing. Im looking at sproggys schematic and as i understand it after the small cap on pin 9 is filled up the signal get sent. so maybe just put your trimmer cap thier and play with it until you get the right delay..

    Maybe you could find the pin outs to the chip for something a little more useful.

    Or perhaps grab the demo of Electronics Workbench.
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