AD to PC Converter (CB7455E)

Found in a Popular Electronics from the 90's, this circuit makes use of an integrated from the uncommon era today. The circuit serves as a reference.

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Transformer coupled AF amplifier (CB21547E)
This circuit is from a book of transistors from 1954. The transistors are from the time and the...
Temperature Test (CB3944E)
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...
Multi Frequency Oscillator (CB4226E)
This oscillator for various frequencies was obtained from a 1980s telecom documentation. The...