This stage was found in a 1964 Electronic Design. The transistors are of the time and the shape of the signal obtained is shown in the diagram.
This circuit uses a common-cathode 7-segment display powered from a decoder and a 0-9 counter. The...
This configuration is used to display the characteristic curve of a diode in the virtual...
This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer...