This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V batteries since it requires a symmetrical source.
Obviously, it is a much more didactic setup than the one with great practical effect, but the idea...
We found this circuit in a 1983 English magazine, but it can be easily assembled with the BC548 or...
Maxim MAX25612 High Voltage LED Controller In stock from Mouser Electronics, this high voltage...