The protection circuit against high and low alternating voltage, a very useful circuit that contributes to protecting household electrical appliances from high and low voltage above the limit value set on it, whether high or low voltage.

You can control the values ​​of high and low voltages through the two variable resistors, as one of the resistors is set to protect against high voltage and the other is set to protect against low voltage.

Description of the protection circuit

The protection circuit against high and low alternating voltage contains many electronic parts that contribute to building an important circuit, in order to use it to protect home appliances at a cheaper price than devices sold in companies and stores.

The circuit is designed to monitor the rise and fall of the voltage of the home network source, so that the maximum voltages (rising voltage and falling voltage) at which the circuit disconnects are adjusted by calibrating the two variable resistors (VR1, VR2).

Planning and Executive Department

You can download the electronic circuit (planning – implementation) by clicking on the box for each circuit.

Protection circuit components

Pieces used in the circuit

Explanation of the operation of the protection department

The circuit is built to protect electrical devices from increases and decreases in network voltage beyond the permissible range or field, and this field is adjusted by calibrating the two variable resistors.

One of the two resistors is intended to adjust the maximum voltage value that can be reached, while the other variable resistor is designed to adjust the minimum voltage value that can be reached.

If the voltage value decreases or increases above the set values, the circuit disconnects in both cases with a red low LED lighting if the network voltage value drops below the permissible limit, or a high red LED lighting if the network voltage value rises above the maximum value.

But if the voltage source is within the permissible range (i.e. in a stable state), the circuit passes current in order to feed the household electrical loads, giving a green light that the network voltage is stable.