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T/C pile switch

Discussion in 'General Electronics' started by Radim S, Dec 11, 2008.

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  1. Radim S

    Radim S Guest

    I have following problem . The Thermopile probe ( 0.5V output @ 600 Deg C
    with internal resistance 2 Ohms ) drives gas valve solenoid with very low
    resistance ( approx. 0.023Ohm ) . Approximate holding current is 250mA .
    So there is only about 5mV on solenoid . I need to cut off this circuit
    with some kind of FEt , MOSFET or opto MOSFET . External circut to control
    this switch can have common ground with above circuit. Cannot use relay -
    external circuit does not have enought current to drive relay. I see
    problem with relativly low switched voltage ( only 0.5V ) and low
    resistance of fet needed .
    Any ideas what could be good solution ?
    Thanks Radim.
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