We found this circuit in a Japanese publication in 1967. The circuit consists of a 15 W audio amplifier with germanium transistors including a voltage indicator power supply.
Found in a Raytheon manual from the 1960s, this simple amplifier uses a metal rod attached to a...
We found this circuit in a publication for radio amateurs in 1977. The circuit allows the...
With this voltage regulator we can build a source of 1.7 to 17 volts and a maximum current of 1.5 A. The...