This well-designed bistable circuit was found in a 1970s documentation. Transistors can be current types and germanium diodes. The voltage depends on the logic used and can be made with 5 V.
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This Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and...
This circuit was taken from the 1976 Siemens Integrated Circuits Manual. The TCA106 is an...
The presented circuit monitors a line indicating if it is busy if there is an extension. The...