This is a commercial circuit from the year 1958. Transistors are germanium types and transformers and coils are hard to fild today. The circuit is destinated to the reception of medium wave stations.
This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the...
This 5-range current measurement circuit was found in the September 1989 issue of Radio...
This oscillator with crystal for overtone operation was found in an old American documentation. The coil...