The integrated circuit used in this 1975 application no longer exists, and it is also not indicated in the original diagram and must be of the TAA series by the diagram.
This aperiodic circuit was found in an old English documentation. The transistor can be any JFET...
We find this circuit in an American 1980s documentation. It can be applied to any operational...
This simple metal detector was found in a 1960 Sylvania transistor manual. The phone must be high...