phase shift oscillator circuit

Posted on Feb 5, 2014

This is a design circuit of a simple inexpensive amplitude stabilized phase shift sine wave oscillator which requires one IC package, three transistors and runs off a single supply. This circuit is combination with the RC network comprises a phase shift configuration and oscillates at about 12 kHz. The remaining circuitry provides amplitude stabil

phase shift oscillator circuit
Click here to download the full size of the above Circuit.

ity. Here`s the schematic figure of the circuit. The high impedance output at Q2s collector is fed to the input of the LM386 via the 10 F-1M series network. This circuit is using op amp LM386 causes it has fixed gain of 20. The 1M resistor in combination with the internal 50 k © unit in the LM386 divides Q2s output by 20. The positive peaks at the amplifier output are rectified and stored in the 5 F capacitor. This potential is fed to the base of Q3. Q3s collector current will vary with the difference between its base and emitter voltages. Since the emitter voltage is fixed by the LM313 1. 2V reference, Q3 performs a comparison function and its collector current modulates Q1s base voltage. Q1, an emitter follower, provides servo controlled drive to the Q2 oscillator.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Oscillators for Buzzers and telephone Earpieces
    85% efficiency SMPS circuit
    simple FSK/AFSK Modulator
    Solar Mailbox project
    Advanced Projects in Laser Communication
    Low Voltage Power Supply