This circuit was found in a Popular Electronics from the 90's. The transistors are general-purpose types and the loaded load depends on the voltage and must have a maximum current of 100 mA.
This circuit was found in ancient American documentation. Diodes are general-purpose types. |...
This 80's General Electric circuit is guarded by the noise-guard for operating current. The...
This circuit was found in the January 1975 Radio Electronics magazine. The diodes are current...