THREE FREQUENCY AUDIO OSCILLATOR


Posted on Feb 6, 2014

The full circuit diagram for the audio sine-wave generator is shown. Resistors R1 and R2 bias the noninverting (pin 3) input of IC1, and their parallel resistance forms one element of the Wien net-work. They are the equivalent of R1 in Fig. 1. The other resistor in the Wien network is R5. Three switched pairs of capacitors (C2 to C7) provide the u


THREE FREQUENCY AUDIO OSCILLATOR
Click here to download the full size of the above Circuit.

nit with its three different output frequencies. Resistors R3 and R4 bias the inverting (pin 2) input of IC1, and their parallel resistance also acts as one element of the negative-feedback network. Thermistor R7 is the other section of the negative-feedback circuit. An RA53 thermistor is the normal choice for this application, but because of its lower cost, an RA54 is used in this circuit. Potentiometer VR1 is the variable-output attenuator. Opening switch S2 introduces losses through resistor R6 that reduce the output by about 20 dB. Use a value of 100 k © for R6 if a reduction by about 40 dB is preferred.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Relaxation box
    Mains variable Delay circuit
    Digital-fiber-optic-receiver
    SPI Interface Circuit for Big 7 Segment LED
    DC biasing audio signal
    Common Collector Colpitts Oscillator
    op amp based sound detector circuit
    Deeply embedded design
    LM386 Audio Amplifier
    Stimulated simple motor speed control circuit



    Top