This well-designed bistable configuration is for educational purposes. We found it in the September 19873 Radio Electronics magazine. The transistors are types from that time.
This optically coupled circuit was found in the February 1968 Radio Electronics magazine. The...
This circuit uses a special 1950's RCA strobe tube. It can be built with equivalent components for the rest...
This circuit, already explored on this site, can be applied to other comparators in the same...