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 is from old documentation. The operational amplifier is uncommon nowadays. The...
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...
This oscillator can generate signals from 100 kHz to more than 50 MHz depending on the crystal used...