Flash-activated flash (CB6749E)

This circuit was suggested by General Electric in 1970 documentation. It makes use of a photo-SCR or LASCR, an uncommon component today.

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Electronic Time Mark (CB16302E)
Waking up to a loud and clear sound from an audio oscillator, after up to 5 hours of sleep, or...
Volume Control (CB19186E)
This circuit was found in a publication from the 90s. The circuit can be assembled with modern...
400 Hz 741 Oscillator (CB17028E)
This conventional oscillator with the 741 can be precisely adjusted to produce a 400 Hz signal. The...