This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are current and the transistor is of general use.
This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at...
This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The...
This circuit was obtained in a 1964 Electronic Design. Equivalent modern transistors can be used....