Secret Diagram

This circuit is a sine wave oscillator which uses operational amplifiers working in oscillation back (positive feedback), or the oscillation output to the input. This oscillator is called Wien bridge circuit is often used. The oscillator Sine wave oscillator is difficult to be done due to the distortion of the oscillation signal, different oscillator square wave, triangle wave oscillator (sawtooth).

Oscillator Sine wave Circuit Diagram




In the case of C1 = C2 = C, R = R1 = R2, giving the frequency of oscillation and can be calculated using the following formula.

Formula Sine Wave Oscillator

The example of the circuit was made this time is shown below.
f = 1 / (2 x 3.14 x 10 -6 0.01 x 10 x 15 x 3)

f = 1 / (0.942 x 10 -3)

f = 1.062 x 10 3

f = 1062 Hz

The actual frequency of the circuit was 900 Hz.