This 2-tube amplifier was found in a Japanese publication of 1964. The circuit has excellent sound quality. The power supply is not given and must provide a voltage of 300 V.
This circuit triggers a relay when it gets dark, thus enabling the lighting of fluorescent lamps, which...
This circuit was obtained from a Radio Electronics issue from January 1989. The indicator is a...
The previous circuit (CB5050E) triggers when the temperature exceeds the limit set on the...