Sound Operated Switchs


Posted on Feb 5, 2014

This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown dotted) will need to be included. A suitable value would be between 2. 2k and 10kohms. The two BC109C transitors form an audio preamp, the gain of which is controlled by the 10k p


Sound Operated Switchs
Click here to download the full size of the above Circuit.

reset. The output is further amplified by a BC182B transistor. To prevent instability the preamp is decoupled with a 100u capacitor and 1k resistor. The audio voltage at the collector of the BC182B is rectified by the two 1N4148 diodes and 4. 7u capacitor. This dc voltage will




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Simple Magnetic Contact Alarm Project
    Tone generator with 555
    The designs and realizing of the electric current based on CAN bus line voltage transducer
    digital counter circuit
    6V6 6J5 Class A Vacuum Tube (Valve) Amplifier Circuit
    LCD series microprocessor circuit diagram of speech synthesis
    Press light switch double circuit 4



    Top