Found in a 90s American documentation, this circuit can be used as a shield, just change the coupler for one that uses a phototransistor.
This circuit is from a 1968 documentation using one of the first integrated circuits available at the...
This circuit was found in a 1965 General Electric documentation. SCRs and unijunction may be...
This precision circuit can be implemented with other operational ones. We found it in a...