This circuit was proposed by a 1965 Electronic Design. Its purpose is to widen the line transients to make them easier to see on common oscilloscopes.
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...