The figure shows how to use an operational circuit as a voltage divider. The circuit is from a Radio Electronics magazine from June 1986. The reference voltage is given by a zener diode.
This circuit safely replaces common locks, since, instead of the key, the opening is made with the...
Based on operational amplifiers of the time, this circuit from the 1980s has high input impedance. The...
Sine signals are converted into square signals by this simple circuit. The maximum frequency is...