We found this circuit in a 1985 documentation. The transformer is an old TV flyback that has an exposed part of the core, where 10 to 20 turns of common wire are wrapped.
This circuit was found in old documentation. D1 can be a diac. | Clique na imagem para ampliar...
This source can supply currents from 10 mA to 500 mA depending on the values of the components used....
This circuit monitors the output level of an amplifier. The circuit is set to R4 and can be...