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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Astable 4001 (CB16312E)
The circuit in the figure produces a perfectly rectangular waveform signal. For a 1 nF C1...
Code Practice Mixer (CB20026E)
This circuit was found in a documentation for radio amateurs from the 70s. The integrated circuits...
2 to 9 kHz PLL Synthesizer (CB4566E)
We found this circuit at Modern Electronics in January 1991. The magazine no longer exists, but...