This simple latching alarm circuit using CMOS gates was found in the May 1990 Radio Electronics magazine. The supply voltage is dependent on the relay.
This capacitor for small capacitances is based on the tuning of a receiver circuit. The variable is...
This 1995 documentation circuit detects when an extension on a phone line is active. Adjustment of the...
This analog tachometer can be used in cars with platinum or in robotic and automation applications to...