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4hv.org :: Forums :: High Voltage
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running a tv cascade of a 15kv 30ma nst
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Download
Mon Mar 12 2007, 01:24AM Print
Download Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
 		hi all
i was wondering if a tv cascade would die if i ran it off a 15/30ma nst? i have two of them but i dont whant to kill them and what would the output voltage be (aproxmate)
would this work?
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Nik
Mon Mar 12 2007, 01:29AM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
 		I would think it would not work because TV cascades are meant to run off the HF output of a flyback not a 60hz transformer.
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Download
Mon Mar 12 2007, 01:32AM
Download Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
 		its 50hz in australia
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...
Mon Mar 12 2007, 03:27AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		Like Nik said, the frequency is much too low to get any decent output from a NST.

The flyback runs at 15khz, as opposed to .05khz that your NST runs at, which (due to the design of the cascade) will only get you a tiny fraction of the power you could get using a flyback.

It is possible to make a doubler/tripler/ets for a NST, just get yourself a bag of 500 in4007's and some doorknob caps (or any string of caps good for 30kv) and start making doubler stages.

see Link2 for more info.
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Download
Mon Mar 12 2007, 03:30AM
Download Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
 		i have go 10 30kv doorknob caps and i need to get the diodes
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nainehctik
Mon Mar 26 2007, 10:25PM
nainehctik Registered Member #606 Joined: Mon Mar 26 2007, 09:42PM
Location:
Posts: 1
... wrote ...

Like Nik said, the frequency is much too low to get any decent output from a NST.

The flyback runs at 15khz, as opposed to .05khz that your NST runs at, which (due to the design of the cascade) will only get you a tiny fraction of the power you could get using a flyback.

It is possible to make a doubler/tripler/ets for a NST, just get yourself a bag of 500 in4007's and some doorknob caps (or any string of caps good for 30kv) and start making doubler stages.

see Link2 for more info.


wont those diodes fail since you are far exceeding their max voltage rating?
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...
Mon Mar 26 2007, 10:53PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		You string a bunch of them in series (input KV * 2 is usually enough, probably best to use 4 for an added safety margin) which raises the max voltage
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Hazmatt_(The Underdog)
Tue Mar 27 2007, 01:18AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		Don't forget some ballast resistance on the output stage to limit the current.
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