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Sine wave is the Basic Input wave form for almost all amplifiers. Now we going to generate a sine wave of 1Khz Frequency and a peak to peak voltage of about 10V without using a signal generator.


CIRCUIT DIAGRAM FOR SINE WAVE GENERATOR


sine wave generator circuit




Components Required to wireup this circuit


Q - BC107

R1 - 47KΩ

R2 - 10KΩ

R3 - 47KΩ

R4 - 4.7KΩ

Rc - 2.2KΩ

Re - 680Ω

Ce - 22μF

C - 0.01μF

Vcc - 12V



OUTPUT WAVEFORM SINE WAVE GENERATOR

create sine wave

Working of Sine wave Generator


The circuit used here, is an RC Phase Shift Oscillator.
It is an RC coupled Amplifier with an phase shifting network, the phase shifted output is again feedback to the input of transistor(base).
We know that By BarkHausen Criteria, an amplifier will act as an oscillator if the phase shifting angle is multiple of 0, 360,........

Here the Resistors R3, R4 and Capacitors C helps to maintain a Phase shift and create oscillations.


Post a Comment

  1. Can the frequency be changed?
    Thanks,
    bkalaska@yahoo.com

    ReplyDelete
  2. Can frequency be changed to 30KHz using this circuit

    ReplyDelete

 
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