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Thread: help with delay circuit

  1. #1
    Maximum Bitrate albysure's Avatar
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    help with delay circuit

    i found this awhile back on aaron's page that i would like to use for my car. can anyone help me out with subststuting an npn transistor in place of the momentary switch? i am planning on hooking it into a power wire on my power supply to trigger it. if anyone can tell me which one i need and how to wire it in to the circuit, i would really appreciate it

    thanks!!

    http://www.aaroncake.net/circuits/relaytim.htm

  2. #2
    Retired Admin Aaron Cake's Avatar
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    A really small reed relay would have the same effect, and is a simple drop in replacement.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  3. #3
    Maximum Bitrate albysure's Avatar
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    hey...thaks for the quick reply.

    so i just wire the reed relay to my computer power supply to trigger it. and use the switched side in the circuit. i got that part

    can you point me in the right direction of what the hell a reed relay is and do i need just a 12v one and it will work?

    if i power it using the computer power supply there will be current as long as the computer is on. i want to use this circuit to delay the turn-on of the amps so i don't get a pop. if this relay has power going to it all the time-will this still work for me?

    thanks again.

  4. #4
    Retired Admin Aaron Cake's Avatar
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    Search Google for reed relay. It will become obvious as to what one is.

    I forgot about the fact that the relay will be triggerd all the time...That may hold the circuit in a continual state of reset, which would be bad. I think your best bet would be to check the datasheet for the 555 timer. It is available at National Semiconductor's site, and has a tonne of timer circuits...You will probably find what you need.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

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