We found this circuit in a 1963 Radio Electronics. It can be used for remote control. The frequency depends on the coil and the power is supplied by a single battery.
This common operational PLL circuit was found in a Popular Electronics 90’s. The power supply need...
This circuit found in a 1988 documentation, uses a piezoelectric or crystal capsule as a...
We found this circuit in a Radio Electronics issue from July 1969. The lamp remains on until C1...