dissecting a PWM circuit

Discussion in 'General Electronics Chat' started by james211, Jul 12, 2014.

  1. james211

    Thread Starter Member

    May 29, 2012
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    So I purchased two of these on Amazon the other day and they work perfect for my project. I've been getting some help from @The_RB on another thread, here, but I wanted to ask a separate question here.

    First off, the controller is good from 6V-90V and up to 15amps. I only need 12V and less than 2amps. Like I said, in the end this works perfect. So my question is, could I build this for less than $10? Second, how hard is it to dissect one of these and have an eagle cad file made?

    A few notes about the motors/pumps. They are peristaltic pumps that run on 12v. They draw very little amps. I'm putting this in idiot terms because I don't want to misinterpret anything, when I set my meter to 20m and measure the current at full speed and lowest speed under load with liquid I get .20 on the meter.

    I've measured the voltage as well at the lowest speed and I can get it down to 4v before the motor starts to stall.
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,520
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    Is it really worth it for $10.00?
    It should be relatively easy to reverse-engineer it however.
    Max.
     
  3. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,282
    1,240
    Unless you are going to make a bunch of them you probably can't do it for $20.
     
  4. james211

    Thread Starter Member

    May 29, 2012
    210
    2
    Yeah, given that amazon has them for $5-$10 cheaper than anywhere else it seems like a pretty decent deal. Thanks for the insights boys. I appreciate your tolerance for my stupidity at times.

    Have a great weekend!
     
  5. james211

    Thread Starter Member

    May 29, 2012
    210
    2
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,979
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    Its an Atiny micro so you need to alter the source code,its available by download.
     
  7. james211

    Thread Starter Member

    May 29, 2012
    210
    2
    IS that all I would need to do? Or do the actual parts need to be changed out as well? The amp draw on the motor is pretty low, 0.2A. What parts of the source code need to be changed? Any ideas? Seams like most of the programming is for the button.
     
    Last edited: Jul 13, 2014
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