This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics magazine. The source must be symmetrical. The capacitors can be changed for other frequencies.
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...
This configuration has already been used several times in many of our projects and can be found in...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...