This filter was found in an 80's English publication. However, it can be implemented with modern operating systems. The circuit can tune frequencies in a range from 10,000 to 1.
This audio amplifier circuit was found in Radio Electronics magazine from June 1966. The circuit is a...
September 2016 - It can be obtained from Mouser Electronics the new inductors for power supply of...
This experimental receiver was found in an English publication in 1979. It can receive medium-wave...