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Capacitance touch switch using MOSFET

Discussion in 'General Electronics Discussion' started by hcccs, Apr 24, 2013.

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  1. hcccs


    Mar 4, 2013
    I'm trying to make a simple capacitance touch switch using a BS170 N-channel MOSFET. The touch plate connects to the gate but I don't know how to choose bias resistor values. It is a 12V circuit and I want the output to drive a SN75441 motor drive. Can anyone give me a helping hand?
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Are you using a pair of plates that you bridge with your finger?

    Do you have a circuit diagram that we can refer to?
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