This battery charger circuit was found in the August 1970 issue of Radio Electronics magazine. The circuit uses 4 transistors. Q1 must be provided with a good heat sink.
This circuit was found in old American documentation. Transistor is general purpose and coil rated...
This tiny photocell-powered audio oscillator was found in a book on transistors from the 1960s. The...
This circuit was found in a Hands On Electronics from the 90s. It is intended to supply old tape...