LM358 op-amp used as comparator, it circuit works with 12V DC supply and consumes 50mA current when Relay is in ON state. One pot used to set the high voltage level and another one to set the low level voltage adjust. For this design, the reference voltages are generated with help of two Trimmer potentiometer. If the signal level is outside of the window, the output is high and Relay is in ON condition. Relay provides normally ON and normally OFF switch. The basic function of a comparator circuit to compare two voltage levels at its input pins and produce an output to show which input voltage has higher potential than the other. If the signal is within the window, the output is low thus RELAY is in off condition and also LED is off. This circuit utilizes two comparators in parallel to determine if a signal is between two reference voltages. It employs two comparators to detect over-voltage or under-voltage condition. ![]() ![]() A window detector circuit, also called window comparator circuit or dual edge limit detector circuit is used to determine whether an unknown input is between two precise reference threshold voltages. Using our idea above of a voltage divider network, if we now use three equal value resistors so that R1 R2 R3 R we can create a very simple window comparator circuit as shown.
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