Will a relay work?

Discussion in 'The Projects Forum' started by Offtwice, Oct 30, 2012.

  1. Offtwice

    Thread Starter New Member

    Oct 22, 2012
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    I have 72 volt dc cart - that when put in reverse - sends a 72 volt positive signal to a buzzer. I want to replace the buzzer with a chime (that can only hande 12 volts). Can I use 72 volts as the signal into a relay to trigger (close) 12 volt connection to the chime?

    If so - I am unsure what size relay I need.

    Perhaps there is a more efficient way to sove this?

    Thanks!
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,176
    397
    Is 12 V available ? Possibly could use a 120V AC coil relay if 72 V DC is not available, or use 48 V DC with dropping resisror. Contact rating sufficient for chime.
     
  3. Offtwice

    Thread Starter New Member

    Oct 22, 2012
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    0
    I have 12 volts available - but the reverse signal is in 72 volts
     
  4. BSomer

    Member

    Dec 28, 2011
    433
    106
    How much do you want to spend?

    Example, which is not stocked.
     
  5. Offtwice

    Thread Starter New Member

    Oct 22, 2012
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    0
    Due to availability and (2amp max switching) and cost, I wonder if a 72 volt solenoid might work instead. I can switch the solenoid with 72 volts and still run 12 volts through the power side????
     
  6. BSomer

    Member

    Dec 28, 2011
    433
    106
    Here is an alternative. It is a solid state relay which is generally better than an electromechanical relay. Max load current is 5A. Do you know how much current is needed for the chime? I can't imagine it being a lot.
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    If the chime draws low amps then a zener is a much cheaper and easier and smaller way to go.
     
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