tuned sine wave oscillator circuit


Posted on Feb 7, 2014

This is a design circuit for sine wave oscillators that will provide both a sine and square wave output for frequencies from below 20 Hz to above 20 KHz. The frequency of oscillation is easily tuned by varying a single resistor. This circuit is controlled by two op amp, LM111 and LM101A. This is the figure of the circuit. In this circuit, an opera


tuned sine wave oscillator circuit
Click here to download the full size of the above Circuit.

tional amplifier has function as a tuned circuit, driven by square wave from a voltage comparator. The frequency is controlled by R1, R2, C1, C2, and R3, with R3 used for tuning. Tuning the filter does not affect its gain or bandwidth so the output amplitude does not change with frequency. A comparator is fed with the sine wave output to obtain a square wave. The square wave is then fed back to the input of the tuned circuit to cause oscillation. Zener diode, D1, stabilizes the amplitude of the square wave fed back to the filter input. Starting is insured by R6 and C5 which provide dc negative feedback around the comparator. This keeps the comparator in the active region. [Schematic diagram source: National Semiconductor. Inc]




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    12-16V-converter
    TDA7360 Stereo Test and ApplicationCircuit and Datasheet
    Yamaha Wiring System
    Amplifying DC Diode Detector Output
    IrDA Interface
    TDA7541 AM/FM Car Radio Tuner IC With Stereo Decoder And Intelligent Selectivity System
    Thrifty LED Protector
    12V-220V Modified Sine-wave Inverter Circuit
    Voltage output humidity sensor meter circuit HM1500 / 1520 with microprocessor PIC16F874
    LC189 making decorative lanterns with fans



    Top