This circuit for the 60 kHz range was found in 73 magazine and published in 1995. The circuit uses a ferrite rod. Note the direction of the coil windings.
This circuit, which appears elsewhere on this website, was obtained from 1967 General Electric...
This circuit can be found elsewhere on this site as part of alarms or sirens. The circuit given is...
This circuit is intended for charging 12 V Nicad batteries, which corresponds to 10 common...