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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Tunable notch filter (CB7404E)
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5 A x 120 kHz pulses (CB9245E)
This high current switching stage was found in a 1967 EEE. The power transistor is from that time....