Found in a General Electric documentation from 1970, this circuit is intended to supply a power LED of the time or Solid State Lamp. No information was given about the core used in the transformer.
This old configuration of an audio amplifier has a push-pull two-transistor output stage. Output...
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....
This circuit is from 1987 documentation. The operating system used is not common today, but two...