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.
With the configuration shown in the figure, we have the relay being activated when the microphone picks...
We found this circuit in a 1992 Poptronics. What it does is to activate LEDs sequentially,...
In the figure we have an application of a voltage comparator in a circuit that fires with the...