Sound Effects Generator Circuit


Posted on Jul 4, 2012

The circuit consists of four parts: a binary counter, a D/A converter, a VCO, and an audio output amplifier. The speed at which the counter counts depends on the frequency of the output of the VCO, which in turn is determined by the output of the counter. That feedback loop gives this circuit its characteristic output. The initial frequency of oscillation is determined by potentiometer Rll. The VCO first oscillates at a relatively low frequency, and it gradually picks up speed as the control voltage supplied by the D/A converter increases. The D/A converter is simply the group of resistors Rl tlirough R8. When none of ICl`s outputs is active, little current will flow into the base of Ql, so the VCO`s control voltage will be low.


Sound Effects Generator Circuit
Click here to download the full size of the above Circuit.

As more and more counter outputs become active, base current increases, and so does the VCO`s frequency of oscillation. The VCO itself is composed of lC2-a, lC2-b, and Ql; the timing network is D1 through D4, 01, RIO, and Rll. The diode bridge functions basically as a voltage-controlled resistor. The buffer amplifier is made up of the four remaining gates from IC2, all wired in parallel. The volume is sufficient for experimental purposes, but you might want to add an amplifier, speaker, or both.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Light/Dark Detector relay
    Sensitive Geomagnetic Sensor circuit
    LED dimmer circuit
    microphone Neumann UM 57
    2meter 144mhz amateur radio transceiver
    btr200
    asymmetric timer
    weather car wont start and radio keyless entry power windows
    VHF Stability
    Frequency electromagnetic RBI timer CD4017
    Surround circuit composed by the TDA3810
    Ultra High Sensitivity Metal Detector Circuit



    Top