This circuit was found in a 80s American documentation. The zener diodes determine the points of action of each stage and the transistors can be general purpose types.
This circuit was obtained in a 1977 magazine, but it can still be easily assembled, as the...
Found in a 90’s American documentation, this circuit indicates the frequency of input pulses up to 1...
This configuration is used to display the characteristic curve of a diode in the virtual...