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modify this to turn on 2 triacs

Discussion in 'General Electronics Discussion' started by nikki81, Mar 8, 2013.

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  1. nikki81


    Jul 16, 2012
    How con I modify this so it turns on 2 triacs to control a 240v heater and a cooling fan I was thinking of connecting the gate of the triacs to the output for the heat and cooling leds will it work ?

    This is the design I was thinking of using for the triac
    Last edited: Mar 8, 2013
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Don't mess with the high voltage circuit.

    The cheap way: connect the heater and the fan in parallel. As long as the combined power is less than the triac can handle, you're fine.

    The safe way: build this circuit twice and connect the inputs of the photocouplers (pins 2 and 2) in parallel. This gives you maximum decoupling of the two circuits, so if one fails, the other won't be harmed.

    Note that you may have to add a heat sink to the triacs.
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