Film marker (CB8347E)

Used with old projector films, this circuit found in Signalite documentation from the 1980s, records digital information on 35 mm films.

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Hearing Aid Amplifier (CB6161E)
This circuit is from a 1968 documentation using one of the first integrated circuits available at the...
12V x 40W Flasher (CB6765E)
This circuit was found in a 1965 General Electric documentation. SCRs and unijunction may be...
Double limit test (CB9593E)
This precision circuit can be implemented with other operational ones. We found it in a...