This old 1 W audio amplifier transistor circuit is from a 1967 Japanese magazine. The transistors are germanium of the time and the type transformers found in similar equipment of the time.
This circuit is from an American publication from the 1960s. The circuit monitors modulated...
The circuit shown in the figure can be used as an indicator of presence and high voltage in a...
Maxim Integrated's MAX17682 integrated circuit is available at Mouser Electronics, a...