11
votes
Accepted
A redesign of a bulky 12 kV source
Currently I’m working with a client that had a circuit that transforms 240 AC (50 Hz) to around 2400 V. After that they use a Cockcroft Walton ladder to boost it up to 12 kV.
Sounds a lot like a ...
7
votes
A redesign of a bulky 12 kV source
I have been working on a hi-pot tester that goes up to 4 kV at 200 µA.
The basic setup is like this:
simulate this circuit – Schematic created using CircuitLab
The flyback transformer raises ...
3
votes
Accepted
Why too many MOVs used in surge protectors?
Typical application of MOV looks like this:
(image credit and more about the topic here)
The image that you have shared seems like eight copies of this circuit, supposed to be wired with eight ...
3
votes
Accepted
Vacuum fluorescent display: What if you power the filament (cathode) with a high voltage and the segments (anodes) with a low voltage?
Former consumer DVD player designer here. I've designed custom VF display panels and systems to drive them.
To the question. VFDs are vacuum tubes. The most basic vacuum tube contains an anode and a ...
2
votes
How can a Class E Power Amplifier be built and experimented with safely?
basically be very carefull Follow the same advice given to those working with vacuum tubes. rubber shoes and one hand behind your back.
2
votes
Switching 5 kV for a neon sign
As an idea for individual 12V->HV supplies, here's a high-volume, novelty quality power supply for a neon tube in the 30cm range.
It was the silhouette of a skating hockey player, in a couple of ...
1
vote
Accepted
How can a Class E Power Amplifier be built and experimented with safely?
OP's circuit does generate voltage spikes at MOSfet drain that can considerably exceed the DC supply voltage. Switching current off quickly to an inductor is the cause.
The circuit fragment of the few-...
1
vote
Vacuum fluorescent display: What if you power the filament (cathode) with a high voltage and the segments (anodes) with a low voltage?
To accompany what others have said:
Voltage across the filament needs to be low enough to not burn up the filament. In old vacuum tubes I believe 6.3V was common, in VFD tubes, it can be much lower (...
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