Op Amp Schmitt trigger

The Op Amp comparators sometimes works well under some conditions but not always. If there is a slow wave form or some noise on it, sometimes the output switch back and forth many times. So for stable operation, Op Amp comparator can be designed as a Schmitt trigger.
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Voltage Comparator

Comparator is a circuit that compare two voltages. When one voltage is higher than the other, the output of comparator is in one state, either high or low. If the input conditions are reversed, output of the comparator switches to the other state.
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Power status LED

Two LEDs indicate the power on and off status of bread board power . So it helps to confirm whether the positive and negative rails of the bread board are getting power. Green LED lights at power on and turns off after 3 seconds. Red LED turns on at power off and turns off after 3 seconds. Let us see the circuit

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