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Help! Newbie 12v ON/OFF circut

Discussion in 'General Electronics Discussion' started by travis.taylor10ee, Mar 16, 2013.

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  1. travis.taylor10ee

    travis.taylor10ee

    2
    0
    Mar 16, 2013
    Hello all!
    First off, I have researched this topic a bit and I THINK I have what I need.
    HOWEVER, I don't want to go charging into the wild blue yonder and fry $20
    worth of parts, so I'd like your advice if you'd be so kind!

    I'm working on an engineering project for college and I need to power a small
    12Vdc (0.5 Amp) gearmotor to agitate an assembly. My question is this..

    What would be a good, SIMPLE circuit to power this motor automatically on for 3-5 seconds, then turn it off for around 3-5 minutes and repeat this for as long as a toggle
    switch is closed?

    Please be gentle, I'm not into electronics much, but need to make everything in this
    project from scratch...

    From what I understand, a 555 timer circuit seems to be the way to go, yes?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,838
    Jan 21, 2010
    3 to 5 minutes is a little long for a 555 timer, but as long as the timing isn't critical, you may be able to achieve it (actually it's a lot long, but aim for the lower end of this range).

    The 555 can drive a relay directly (remember a reverse biased diode across the relay coil).

    I would operate the 555 from a separate (say 9V) battery to keep the power to it clean. The fact the relay is only energized for a few seconds means the battery should last for quite a while.
     
  3. travis.taylor10ee

    travis.taylor10ee

    2
    0
    Mar 16, 2013
    A reversed biased diode?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,838
    Jan 21, 2010
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