This circuit is from an old Japanese publication of 1962. The circuit uses two batteries, one for the filaments of the tubes and the other one of high voltage for the plate circuits.
The 50 kHz signal generated by this circuit is applied to a low impedance inductive transducer. A...
This different audio amplifier was found in a 90's Electronic Design. The circuit uses components...
This circuit converts a resistance in the range between 1 k ohm and 1 MΩ to a signal in a...