This detector uses an unusual sensor today. The circuit is from an 80s documentation. Its sensitivity is 10 ppm. The transformer has two secondary voltages.
We found this circuit in the April 1988 issue of Radio Electronics magazine. The circuit can be...
This amplifier allows you to recover recorded tapes from a tape player that has the mechanism in...
In the figure we have the way to simulate an SCR using two complementary general-purpose...