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Square wave oscillator schematics

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Small Footprint Square Wave Oscillator

Small Footprint Square Wave Oscillator

This is a small footprint 50 percent duty cycle square wave oscillator with variable frequency from 10kHz to 30MHz. The frequency range can be extended to 1kHz by using 1M instead of 100k for R6.

http://www.triplespark.net/elec/oscillator/LTC1799/

Square wave oscillator

Square wave oscillator

which used the Schmitt inverter circuit which was made with the CMOS.

http://www.hobby-elec.org/e_ckt13.htm

Square wave oscillator

Square wave oscillator

The oscillation frequency can be calculated using a formula

http://www.hobby-elec.org/e_ckt29.htm