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DIY spike arrester

Discussion in 'Electronic Design' started by r.p.mcmurphy, Aug 18, 2004.

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  1. r.p.mcmurphy

    r.p.mcmurphy Guest

    hi all, have instaled an alarm at my house and garage that is having false
    alarms at midnight some nights. i think its proberbly due to surges or
    spikes from when the lecy meter swaps over to economy 7 rate. im only an
    amature, but id like to knock up a 12v arestor to stop false alarms...can
    any one sugest any components?

  2. CFoley1064

    CFoley1064 Guest

    Subject: DIY spike arrester
    That wouldn't be Randall P., would it?

    One flew east, one flew west,
    Stop false alarms and get some rest.

    Try a 10,000 uF 25V electrolytic cap across your power supply at the box. That
    will keep the alarm power supply stable for spikes and surges.

    Radio Shack sells a package of two 4700 uF 35WV axial caps which should do the
    job, Catalog #: 272-1022, if you use them together like this (view in fixed
    font or M$ Notepad):

    12VDC Power supply Alarm Circuit
    .-----------. .------------.
    | | | |
    | o------o------o--------o |
    | | | | | |
    | | +| +| | |
    | | --- --- | |
    | | --- --- | |
    | | | | | |
    | | | | | |
    | | | | | |
    | o------o------o--------o |
    | | | |
    '-----------' '------------'
    created by Andy´s ASCII-Circuit v1.24.140803 Beta

    Make sure the power's off when you put the caps in the circuit, and make sure
    the - side of the caps lines up with the - of the power supply. Don't take it
    out on Nurse Ratched if you forget, OK?

    Good luck.
  3. Also make sure your sensor cable is not routed near florescent lights or
    other voltage producing sources. (Refrigerator/freezer motors, etc.)
  4. r.p.mcmurphy

    r.p.mcmurphy Guest

    Well done...i knew it wold click with some one eventualy! thanks for the
    advice....and its nurse Ratchet wasnt it?

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