This interesting circuit was found in an 80's Electronic Engineering. The circuit has a 50% active cycle. R and C determine the generated frequency.
This experimental receiver was found in an English publication in 1979. It can receive medium-wave...
Is already availablefrom Mouser Electronics is the new reflective B5W-L01 sensor for convergent...
This high-gain circuit uses junction FETs (JFETs) and must be powered by somewhat high voltages. The...