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changing DC voltage

Discussion in 'Electronic Basics' started by Fritz Oppliger, Aug 23, 2004.

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  1. I want to regulate a peltier cooler. Manufacturer says they don't like to
    be switched on and off alot, they prefer changing input voltage.
    On the controller I have available a DAC output 0...2.5 VDC .
    What is the most elegant way to turn this into 0...14VDC at 6 amps max?
    Thanks-
     
  2. A power MOSFET circuit would do the job nicely. You may need to drive
    the gate via an amplifying transistor (like a simple 2N2222) to get
    the voltage range you need.

    BRW
     
  3. Andyb

    Andyb Guest

    I built something to control one of these things a while back. The
    manufacturer said that it is okay to use pulse width modulation at
    frequencies above 1kHz, so that's what I did and it worked fine! If you
    don't get any joy with an analogue solution, you could think along the lines
    of 555 - H-Bridge.

    Good luck!

    Andy
     
  4. Thanks-
    One of my dilemmas is that I have run out of digital output lines but have
    these DACs sitting idle.
    So I'll try that first.
     
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