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Thread: doubt on clap switch

  1. #1

    Default doubt on clap switch


    general description
    used to turn a device on or off by sound only, eg; clap. when triggered in ckt. it will stay on or off till triggered again.

    how it works
    ckt has 2 stages - preamp usin trans. q1 4 amplifying mic signal. second consists of 2 transistors q2 and q3 as a FLIP FLOP. (can some one explain this part of the circuit to me.)
    flip flop is triggere by preamps o/p. it in turn triggers o/p transistor q4 which controls relay. (can someone explain connection of a 5-pin relay to me. is my interpretation at the bottom of the page correct.).
    with each change of state of the FLIP FLOP o/p transistor will be forced to chage state being on or off. this in turn turns the relay on or off. relay is changeover type and it's contacts are rated 220 v/ 3a/6a. microphone is condensor type 4 gr8er sensitivity.

  2. #2


    this diagram shows a five point relay connection.

    View the diagram from right

    That is how u get a normal 12V or 6V relay

    If you don't have much experience in analog ckt,then better go for this ckt
    mic+preamp+comparator(Lm324)+FlipFlop(D)+power transistor+relay

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