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PWM Controller Troubles

Discussion in 'General Electronics Discussion' started by Cccf, Feb 28, 2016.

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  1. Cccf


    Feb 28, 2016
    So, I'm trying to motorize a bicycle using a 12v 26a max dc motor. I recently bought a 40a max pwm speed controller, and it worked fine for a bit. Unfortunately, I left the circuit board exposed on the workbench and it shorted out on a stray bit of metal. I can't see any visible damage, but the controller no longer works; the motor just runs at full power whenever I connect it. I saw a component in there that looked like a fuse, but it has four terminals, and I can't tell whether it has blown or not. I also found that there is a 555 ic, which I have an extra of lying around. Any ideas on how to fix the problem?
  2. Minder


    Apr 24, 2015
    If this is one of the $5.00 PWM controllers on ebay, they are typically 555 based and use a Mosfet for the PWM drive, you most likely have blown this, one source of replacements would be Digikey.
  3. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    For $5.00, just buy another board. The parts will cost more than the module.
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