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.
This circuit was found in the January 1994 Electronics Now magazine. The transistors are general...
This circuit was found in a 1994 publication. It can receive signals from the 3 to 20 MHz band,...
This stabilized source can supply currents up to 200 mA with the indicated transistor or 500 mA...