Found in 1965 General Electric technical documentation, this half-wave circuit controls shunt type motors of maximum 1 A with voltage up to 400 V.
Texas Instruments has downloadable documentation on designing digital isolators. The Digital...
This shield circuit with an optical coupler was found in an 90s EDN. The circuit can be used with...
This circuit was obtained from a 1990s documentation. The transistor admits equivalent and other...