This circuit was found in a 1966 General Electric documentation. The circuit makes use of PUTs that are uncommon components today. Counting direction depends on the programming in A and B.
Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components...
Mouser Electronics has in stock the MUSBR robust connectors for USB 30 applications from Amphenol. These...
This interesting transistor configuration, which can be seen elsewhere on this website and in this...