Found in a 1960s documentation, this circuit uses a transistor to drive a relay as well as a set of neon lamps with high voltage power supply.
August 2016 - It can be obtained from Mouser Electronics the new DC-DC PFM Step-Down XC9272 from...
This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be...
An interesting interface solution that can be provided in some cases is the one shown in the...