This frequency divider with SUS was found in General Electric's 1967 documentation. Similar configurations can be found elsewhere in this section and on this website.
This metal detector was found in a 2001 Poptronics, but it can still be easily assembled, as the...
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
With this circuit it is possible to have a safe indication of the balance point for the signals of the...