This variable frequency oscillator for radio transmission covers the range from 1.6 MHz to 20 MHz, depending only on the coil used. The circuit is very stable and can be used in amateur equipment.
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...