This circuit with 117 V output was found in a 1969 Electronic Design. Drive transistors admit equivalents and information about transformers is not given.
This instrumentation amplifier with differential inputs was found in documentation from the 90s....
This signal follower was found in a 1976 publication. The FET can be BF245 or MPF102 and any...
This is a simple circuit to control a set of lamps from 3 different points. We found it in an old...