Poll

High voltage switch for Neon transformer (NST)

High voltage switch for Neon transformer (NST)
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How to switch high voltage output of a Neon transformer (NST)
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Total Members Voted: 0

Voting closed: January 27, 2024, 09:13:59 AM

Author Topic: Switching output of high voltage Neon transformer  (Read 1895 times)


Offline Anders Mikkelsen

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Re: Switching output of high voltage Neon transformer
« Reply #1 on: January 22, 2024, 02:52:22 PM »
Modulate to what extent? What type of modulation and at what rate?

That supply will likely give a HF (20 - 60 kHz range) output, modulated by full-wave rectified mains voltage. The solid state NSTs I've taken apart use the self oscillating BJT half bridge circuit commonly also found in compact fluorescent bulbs and state halogen transformers. You can shape the envelope of the output by modulating the input voltage to the NST, if you don't require very fast modulation.

Offline resolnhoh

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Re: Switching output of high voltage Neon transformer
« Reply #2 on: January 23, 2024, 11:18:55 AM »
Hi Anders
thank for the reply and follow up questions.

I intend to build a "Lichtenberg machine", which essentially is a system burning decorative patterns (Lichtenberg Pattern) into wood.
Varying voltage would allow me to change the pattern (branching, depth).
Ideally, the switch should be stepless (like a volume button).

It would be a LOT easier to add a switch to the 220 V input side of the transformer rather than to the 10,000 V output side. As long as the output side can be regulated by reducing Voltage on the input side.
« Last Edit: January 23, 2024, 02:20:56 PM by resolnhoh »

Offline Anders Mikkelsen

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Re: Switching output of high voltage Neon transformer
« Reply #3 on: January 23, 2024, 12:43:01 PM »
In my experience, these kind of supplies lend themselves well to power control by changing the input voltage. My experience is based on Hongba HB- series SSNSTs. A variac would work, and a dimmer might work in a pinch but this is not guaranteed. I've used variable DC supplies to power them, but you need one that goes up to some 200+ V.

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Re: Switching output of high voltage Neon transformer
« Reply #3 on: January 23, 2024, 12:43:01 PM »

 


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