Astable oscillator

  
Before power is applied, the input and output are at ground potential and capacitor C is discharged. On power-on, the output goes high (Vdd) and C charges through R until V is reached; the output then goes low (Vss). C is now discharged through R until Vn is reached. The output then goes high and charges C towards VP through R. Thus input A alternately swings between VP and Vn as the output goes high and low
Astable oscillator - schematic

This circuit is self-starting at power-on.




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