Choose the two signals or values to compare
Determine the reference level or threshold
Use an op-amp, comparator IC, or digital logic gate
Connect one input to the signal to test
Connect the other input to the reference voltage
Add positive feedback if hysteresis is needed
Power the comparator with the correct supply voltage
Ensure input voltages stay within the allowed range
Add pull-up resistors if using an open-drain or open-collector output
Connect the output to the next circuit stage
Test the circuit with values above and below the threshold
Adjust the reference voltage or feedback values if needed