380 volt circuit continuity tester

There’s always a need for a multimeter when working with electronic circuits. Especially when it comes to semiconductors. Using the internal diode test, which is now a part of every good meter, we are able to double-check the proper function of every diode, bipolar transistor and the like, before using them in our projects. However, there are still certain parts, for which … [more]

Nixie tube tester

This very simple circuit can be used to verify the proper functionality of each cathodes in a Nixie tube, which was the predecessor of the solid-state LED 7-segment display, back in the 1960s and early 70s. The main anode voltage is obtained from a simple, battery-powered flyback inverter with just enough voltage to strike the glow discharge, and an adjustable resistor current limiter… [more]