This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but the high input impedance makes it useful for radio applications.
The circuit suggested in the figure differentiates the signal from the negative front of a...
This frequency triple oscillator circuit was found in an American publication in 1967. The FET is...
This circuit was originally recommended for an electric oven warning system. However, we can use...