This commercial signal follower was found in a 1967 Japanese magazine. It uses germanium transistors and provides a speaker output without the need for a transformer.
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...