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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500 ohms Audio Amplifier (CB13668E)
We found this audio amplifier stage with 500 ohms of input impedance in an old American...
Astable Timer (CB15017E)
In this circuit the 555 is configured as an adjustable timer for long intervals. The capacitor C1 can be...
Visit Announcer (CB23856E)
This simple circuit published in the November 1962 Radio Electronics magazine beeps when the light...