60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

Burnt out lamp indicator (CB10449E)
This circuit was obtained in a 1977 magazine, but it can still be easily assembled, as the...
Walkie Talkie (CB20470E)
This intercom for the 27 MHz band was found in a recent English documentation, working with a...
Shield with 7481 (CB24730E)
This relay shield circuit for old computers was found in January 1983 Radio Electronics magazine. The...