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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Audio Frequency Meter (CB3877E)
Audio frequencies in the 300 Hz to 30 kHz range can be measured with this circuit. Transistors allow...
Alternator Voltage Regulator (CB6375E)
This circuit was found in an Electronic World of 1968. The circuit uses power transistors of the...
Delayed Pulse Generator (CB25729E)
Delayed Pulse Generator This can be considered an "advanced" application where two 555 integrated...