Found in American documentation from the 90's, this JFET stage has an input impedance of 500 M ohms. Bipolar transistors are general purpose types and the FET supports an equivalent.
This sensor circuit was found in an American 1980s documentation. Modern operational amplifiers can...
This circuit found in 1969 Popular Electronics is used to power a gas laser. The circuit produces...
This LC circuit oscillator was found in the July 1993 issue of Electronics Now magazine. The...