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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Logic level shifter (CB7254E)
This circuit was found in a 1966 EEE. What it does is it converts the logic levels of 0 V and +4 V...
MOSFET Electroscope (CB1392E )
This circuit is from a 1976 documentation. It makes use of isolated gate MOSFET which is already very...
Musical 5-Note Buzzer with the 4017 (CB12143E)
This interesting effect circuit was found in a 1982 publication. The sequence of musical notes is...