This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the zener, the circuit can be used to monitor other voltages.
This small automotive NiCad battery charger uses only passive components and has the number of...
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...
This 20 Hz high-pass filter was obtained in a 1965 American publication. The operational amplifier must...