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Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Why variable coupling? You're not running it in resonance, wouldn't you want the coupling factor to be as high as possible to minimize load dependency of the output voltage?
Could someone educate a layman? Why can't you just wind 11 concentric windings with tapered copper foil and 3+ mil Mylar insulation on a ferrite C core and dump it in oil to get a 10:1 10 kV MF auto-transformer? (Similar design to aircore HV pulse transformers, just with a ferrite core to get a higher coupling factor ... since neither the high power nor the high frequencies of those designs are necessary.)
PS. oops, nevermind ... the low number of primary turns are of course only possible in air core transformers, and it will have far too low reactance :/
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Sulaiman wrote ...
I'd be inclined to go for a low power oscillator, a power amplifier (something like ) and an air-core transformer with variable coupling. (something like a Tesla Coil primary : secondary)
Is that not around ten times more powerful that required here? ("10kV at 'a few' mA" is ~30W)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Now that you have upped the frequency to 10 MHz, what you are describing is little different to a basic CW HF transmitter.
Here is the 50W HF power amplifier stage of such a transmitter, which must be driven by an oscillator, and followed with an impedance matching circuit to couple the RF energy into the load, as Sulaiman has suggested.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
A BN-43-3312 is a 1 inch ferrite bead, I don't think that circuit outputs 10 kV.
Microwatt, does the output voltage have to be regulated or can the load be assumed to be fixed impedance (making the use of a low coupling factor transformer without any further regulation possible).
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
why not build a small VTTC with a 1-3 MHz secondary, with a horizontal output tube? The circuit can run from rectified or voltage multiplied mains and has very few components. The voltage can be regulated with a variac.
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High voltage very high frequency
