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 linear bargraph circuit was found in the February 1992 issue of Radio Electronics magazine. The 10...
Found in a 1967 American documentation, this circuit increases the duration of a pulse applied to its...
This sensitive circuit for triggering relays was found in an old English publication. It works with...