This implies that during both the conditions a high logic is generated at the cathode junction of the diodes connected with the opamp outputs. We already know from our previous post that whenever the input voltage crosses the higher threshold, a logic high is created at the output of the upper opamp and when the voltage drops below the lower threshold the lower opamp generates a high logic at its output. The P3 preset or pot is used for setting up the delay time switch ON for the IC 4060 stage How it Works: This should be constructed with an opamp oscillator circuit in this functionality. Upon detection of over-and under voltage protection, the circuit should give a beep of 5 seconds. Only when a voltage is less than 125VAC, it must indicate the protection circuit "normal tension" by a green LED that lights up. Similarly, the line voltage protective circuit has to be higher than 130V ac "high voltage" will be indicated by a red LED that lights up. If the line voltage is present, the protection circuit must pass a voltage greater than 105 Vac "normal tension" it will indicate by a green LED that lights up. If the line voltage is less than 100VAC, the protection circuit "low voltage" must indicate by a red LED that lights up. If the line voltage is outside the normal voltage, the output of the protective circuit will never be under tension. The protective circuit must comply with the following: If the line voltage is within the normal range (100 to 130V ac), it will wait for the protective circuit 3 minutes before the output will be energized. The protective circuit must immediately switch off upon detection of low-and high-voltage household appliance and upon detection of normal voltage switch on again after 3 minutes.To design a safety circuit that should provide for household appliances for over-and under-voltage protection.I just followed you're explanation and is it possible that you can help us with the following:.The idea was requested by one of the dedicated members of this website.
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