Voltage to frequency converter (CB8928E)

Found in ancient American documentation, this circuit uses an operational amplifier of the time, which is uncommon today.

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Medium Wave Transmitter (CB21736E)
Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can...
Constant current regulator for lamps (CB8696E)
Found in 1969 RCA documentation, this circuit maintains constant current in the filament of a lamp...
Two-tone decoder (CB8719E)
Found in a 90s 73 magazine, this circuit uses an unusual component today which is the XR2206. |...