We found this circuit in a Radio Electronics from October 1963. The circuit uses an output transformer with a center tap. The trimpot is adjusted for higher gain and lower quiescent current.
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...
This circuit has been found in an old American documentation and is intended for calibration of radio...
This configuration appears several times on this site. The circuit can generate a 100 kHz or other...