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Thread: "Delaying" a 12 volt signal?

  1. #1
    Maximum Bitrate kiltjim's Avatar
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    "Delaying" a 12 volt signal?

    It may be late, I may be a little fried from exams and the such, but I'm usually pretty quick on figuring out this kinda stuff.

    I need to "delay" a 12 volt signal getting to one part of a project I'm working on. Something like this....


    Switched +12v ----> Delay of sorts ----> Delayed Switched +12v

    I basically need to prevent a relay from turning on too quickly.
    (A huge length of wire won't work...so don't suggest it...)

    Any suggestions?
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  2. #2
    Raw Wave rando's Avatar
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    You can use an RC network to implement a delay. Search the forums for examples.

  3. #3
    Maximum Bitrate kiltjim's Avatar
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    Just found it. See? Too much work, and not enough sleep hurts.

    Unless you're a programmer. But that was last semester.
    2000 Subaru OBS

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    I am Zero Bitrate....

  4. #4
    Nic
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    (A huge length of wire won't work...so don't suggest it...) <<< hahahaha
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  5. #5
    Low Bitrate megamind's Avatar
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    We use special delay relais. You have them in 2 versions:
    1: Give em power, they wait a period of time and switch in
    2: Unpower them and they wait a period of time to switch off

    You need the 1st one, ill look for you if i can find it somewhere.

    In the meanwhile here's a scheme:


    Its for 230v ill make a 12v version with a capacitator and a relais if you want to

    edit: you should look at the topic sticky in the forum

    http://www.mp3car.com/vbulletin/atta...tid=4455&stc=1
    05155'30"N 0434'31"E

  6. #6
    Maximum Bitrate mushin's Avatar
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    I'm no expert on these things, but wouldn't using a 555 timer be easier?

  7. #7
    Maximum Bitrate kiltjim's Avatar
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    No, the RC network is what I was looking for. Now, all I have to do is find a resistor that is low enough not drop the voltage too far. And match a capacitor to it.

    The 555 timer would work in one shot mode, but not for the size I'm working with.
    2000 Subaru OBS

    Dell P3 @ 900 Mhz
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  8. #8
    Newbie Multiplayer's Avatar
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    Kiltjim
    If you look in the sticky "scematics" theres som nice delay circuits, which are rather simple circuit's.

  9. #9
    Low Bitrate
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    If you need an easy way, just get the PAC TR-7 universal trigger module from your local car audio shop. It's also known as "Alpine Video Bypass" module on ebay.

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  10. #10
    Maximum Bitrate XxAndyxX's Avatar
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    Here's what you need to do; I just did this in my car yesterday. You need to buy a DEI pulse timer relay. The part number is 528T. Basically what it does is when it receives a signal (can be + or -) it will disconnect a wire for a set amount of time (you can adjust it from 0 to 90 seconds). Which sounds like what you are wanting to do. Here is a link for the part http://www.drdetailshop.com/528T.htm

    I saw them on ebay going for like 6 bucks and I got my from a local shop for $10.50. So I don't think you should buy it from the link above.

    I didn't read the replys so if this is redundent I apologize.

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