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DC temperature circuit

Discussion in 'Electronic Basics' started by curtrw, May 21, 2004.

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  1. curtrw

    curtrw Guest

    Hi, my name is Curt. I'm pretty much a novice at electronic circuit
    building, having only built a couple of simple circuits. (555 timer)
    My problem is I'm trying to build a 5-12volt dc circuit that will cool an
    object (mirror) to ambient temperature via a fan, and then maintain that
    temperature. Any referals or suggestions would be greatly appreciated.

    Thanks in advance,
  2. A fan cannot cool a source of heat all the way to ambient temperature,
    but can only reduce the temperature rise above ambient. If you want
    to cool to at or below ambient you also need some sort of heat pump,
    like a peltier cooler.

    In general, to hold a temperature to a setpoint you need a sensor to
    measure the process being controlled, a feedback controller (in
    simplest form an opamp connected up as an integrator) and an output
    device (fan, cooler, etc.).

    Once I better understand your requirements, I can make more useful

    How much heat energy (watts) are you trying to dissipate? What sort
    of physical package is this heat source contained inside?
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