This small commercial radio for the MW band with germanium transistors was found in Japanese documentation from the 1960s. The circuit is powered by a 9 V battery and has a 455 kHz IF.
The circuit is suitable for calls in a residence and was published in the Radio Electronics...
This 25 W phase photo control was found in a 1965 General Electric publication. The circuit uses a...
The integrated circuit in question is an adjustable high voltage regulator from Texas Instruments...