This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply voltage should be according to the relay used.
This circuit is indicated to operate from high impedance sources as piezoelectric transducers....
Mouser Electronics is offering the new INA3221 integrated circuit consisting of an amplifier for...
This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a...