Full wave rectifier (CB9455E)

This precision signal rectifier was found in an Electronic Design. The components used are from that time, uncommon nowadays.

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Three-decade VCO (CB20603E)
The circuit is from American documentation from the 1980s. Operational ones are not common today,...
Continuity Tester (CB26192E)
This simple continuity tester consists of an oscillator found in the 1983 Electronics Experimenter Special...
Low Noise Preamplifier LM1303 (CB19617E)
This circuit is from a 70s linear integrated manual. The integrated circuit used is uncommon today...