Square Wave GeneratorThis square wave generator is like the Schmitt trigger circuit in that the reference voltage for the comparator action depends on the output voltage. This circuit is also classified as an astable multivibrator.
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Period of Square Wave Generator
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Square Wave Period: Details Now taking the natural logarithm of both sides: 
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Square Wave Generator
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Square Wave Generator Process
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, the frequency does not depend upon this supply voltage. If you supplied it with a variable voltage, you could freely change the amplitude without changing the frequency. You could then make it a variable frequency source by making either C or R variable.