This circuit, very critical due to the frequency at which it operates, was found in an American documentation that uses a resonant cavity in a beer can. The transistor can be of any type for RF.
This signal attenuator was suggested by Electronics Now magazine in April 1999. The circuit is...
This circuit is from a manual of linear integrated circuits of the 80s. The operational is of the...
This circuit is from a 1978 publication, and the integrated diode bridge can be replaced by...