DTL NOR gate (CB6922E)

This circuit was found in a 1969 Ferranti documentation. It can be implemented with modern equivalent transistors and diodes.

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Door Open Alarm (CB6367E)
This 80's circuit, suggested in Texas Insrtruments documentation, uses a Hall effect sensor. The...
Light Comparator (CB1383E)
This circuit, from a publication of the 1970s, can compare the intensity of two light sources,...
Light Activated Relay (CB948E)
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....