Found in a 1969 documentation, this circuit for the 20 MHz band does not use a transformer. The circuit is a phase detector that makes use of the transistor of the time.
This circuit can be used with receivers to attenuate signals that may cause interference. The...
This circuit is from a Linear datasheet. The circuit provides a 5 m voltage with 40 mA from an AA...
Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The...