This noise generator for the audio band was found in a British publication from the 1970s. The circuit can be implemented with modern equivalent transistors.
This power supply for gas laser (HeNe) was found in a 90’s Popular Electronics. It generates from 1300...
This electronic Morse key was found in a Popular Electronics from the 90's. The components are common,...
This circuit was obtained in an old European publication on FETs. The FET admits equivalent and...