The operational amplifier can be of any type in this circuit, found in a 1974 publication. The resistors indicate the level detected. The power supply must be symmetrical. R1 and R2 may have typical values of 10 k ohms. VR is the reference voltage.
The operational amplifier can be of any type in this circuit, found in a 1974 publication. The resistors indicate the level detected. The power supply must be symmetrical. R1 and R2 may have typical values of 10 k ohms. VR is the reference voltage.