AD converter with LCD display (CB9025E)

This circuit was obtained in Teledyne documentation from the 70s. The converter component is uncommon today.

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Alarm with Timed Shutdown (CB4801E)
This circuit was found in a former Popular Electronics. The timing is given by R1 and C1, R4 and...
Signal generator CIR15041S (CB7922E)
This oscillator, which can be used as a signal injector, was found in a Popular Electronics from the 90s....
Bass Boost (CB945E)
This circuit was found in Italian magazine (1988), but can be mounted with ease even with the...