Found in documentation from the 1980s, this highly sensitive circuit is based on the conduction by the presence of gas from an ionization chamber. The components are from the time.
This interesting touch dimmer was obtained in a 1993 publication, basically consisting of a...
This circuit was found in an Electronic Design from the 90s. The circuit uses a type J...
This amplifier was published in Radio Electronics magazine in September 1959. The 8-transistor circuit...