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 an old operational amplifier manual. The operational amplifier can be of...
This receiver we found in a 1992 documentation operates in the 27 MHz band, triggering a relay...
This amplifier is from a commercial product from the 1970s. The circuit uses germanium transistors and...