Self-oscillating generator (multivibrator) of rectangular pulses

The circuit of the self-oscillating generator (multivibrator) of rectangular pulses is based on the circuit of a differentiator on an operational amplifier, in the circuit of which positive feedback is introduced, formed by resistors R2 and R3.

Self-oscillating generator based on an operational amplifier
Fig. 1. Self-oscillating generator based on an operational amplifier

The pulse frequency depends on the timing chain R1C and is determined by the formula:

f= 1

2ЧR1ЧCЧln((1+R')/(1–R'))

R' = R2 / (R2 + R3)

Use our online Op amp square wave generator calculator.


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