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Need to trigger sound playback device

Discussion in 'Electronic Basics' started by [email protected], Oct 3, 2004.

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  1. Guest

    I am building a Halloween prop and I'd like to add sound to it.

    I was looking at this cheap solution:
    http://www.sonic.net/~trueoak/Digital_Sound_Recorder.htm


    It's a simple playback device. It has an input for a switch. I want
    to tie that input to a relay so when the motion detector is tripped it
    triggers the sound.

    When the detector trips, it will supply AC to a power strip. One of
    the things plugged into the power strip will be an 8VDC supply to
    drive a DC motor. An incandescent light will also come on.

    In other words, when the detector trips, I will have 120 VAC and 8VDC
    available to me.

    Should I go with a AC or DC relay? Any specific info as to which one?
    I'm going to be ordering some stuff at allelectronics.com.

    Thanks!
     
  2. CFoley1064

    CFoley1064 Guest

    Subject: Need to trigger sound playback device
    Aha! As Maxwell Smart would say, the old MS-13A Motion Detector / TM-751 X-10
    Mini-Transceiver Module / PW-101 Outlet Strip trick. Well, in order to
    complete the Halloween scene, and have Agent 99 swooning in your arms (;-), you
    might want to use the RLY-2120 120VAC 10A relay ($2.75 ea.) with an 18-2 line
    cord and some 0.187" quick connects (you'll have to go to the hardware store
    for them -- they're not in the All Electronics catalog). Plug the zip cord
    into the outlet, and quick connect the other end to the relay coil, and you're
    good to go. Be sure to secure the relay -- hot melt glue isn't good enough.
    Also, make sure all your electrics and electronics are in a non-conductive
    enclosue safe from rain, and don't keep it outside with condensing humidity.

    Good luck with Agent 99
    Chris
     
  3. Guest

    Thanks...sounds great.
     
  4. Guest

    By the way, what's the best way to secure the relay?

    The project enclosure I bought is too small, so I have to get a
    different one anyway. Might as well get one big enough to house the
    circuit, battery, mic/speaker and realy.
     
  5. CFoley1064

    CFoley1064 Guest

    Subject: Re: Need to trigger sound playback device
    Since this is a Halloween project, I'd recommend the time-honored cigar box.
    I'd also look at plastic craft boxes and such -- you probably threw out several
    acceptable boxes this month. The important criteria are sturdiness and
    non-conductivity.

    Also, in the time honored Halloween scare 'em project tradition, I'd use
    Ty-Raps to wedge the relay in a corner of the box and reinforce with hot-melt
    glue.

    If you want ideas for Halloween stuff, go to the library or video store and
    rent Tim Burton's "The Nightmare Before Christmas".

    By the way, be sure your stuff is fused. Don't depend on the circuit breaker
    in case something goes wrong. And if you don't know what you're doing with
    line voltage, ask or let someone who does help you.

    Good luck, and play safe
    Chris
     
  6. Rich Grise

    Rich Grise Guest

    Don't slight "Beetlejuice." ;-)

    Cheers!
    Rich
     
  7. Guest

    All is working well.

    There's one catch: The minimum time on my motion detector is 20
    seconds. My audio playback device can only hold 10 seconds of audio.

    Right now, the motion detector powers the power strip, which turns on
    the zombie, the PC speaker, the strobe light, and energizes the relay
    to trip the playback device.

    Is there some way I can get the playback device to play TWICE for each
    cycle of the motion detector?
     
  8. All is working well.

    There's one catch: The minimum time on my motion detector is 20
    seconds. My audio playback device can only hold 10 seconds of audio.

    Right now, the motion detector powers the power strip, which turns on
    the zombie, the PC speaker, the strobe light, and energizes the relay
    to trip the playback device.

    Is there some way I can get the playback device to play TWICE for each
    cycle of the motion detector?
     
  9. ehsjr

    ehsjr Guest

    Yes.
    Post your circuit.

    Ed
     
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