60's crystal radio (CB22171E)

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

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Touch Keyer (CB26322E)
This CW circuit was found in a Radio Amateur Today from the 890s. The CMOS circuit must be powered by...
Adjustable reference (CB21539E)
This circuit was obtained from an old American publication. The uA702 is a differential amplifier and...