ASTABLE MULTIVIBRATOR USING OP AMP

  
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This circuit is also called as Free Running Oscillator. Because, it doesn`t requires any trigger pulse to get active. Consider the instant at which Vc=+Vsat. Now the capacitor charges exponentially towards +Vsat through R. Automatically, Vd increases and crosses zero. This happens when Vc=+ ²Vsat. At the moment Vd becomes positive due to further
ASTABLE MULTIVIBRATOR USING OP AMP - schematic

charging of the capacitor. Output changes to -Vsat. Now capacitor starts discharging to zero and recharges towards -Vsat. Now Vd decreases and crosses zero. This happens when Vc=- ²Vsat. At the moment Vd becames negative again, output changes to +Vsat. This completes one cycle of output.



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