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4hv.org :: Forums :: Tesla Coils
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A question about VTTC

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hyparh
Sun Mar 24 2019, 01:08PM
hyparh Registered Member #1054 Joined: Wed Oct 10 2007, 10:51PM
Location: Bulgaria
Posts: 29
Thanks for the analysis! Yep, I have one 5KVA variac - very handy for different experiments.

I think I found a very good solution for the cooling (price, dimensions etc.): Link2
"Air Volume: 190.30CFM"

PS. That's one neat VTTC you've got there! :) (though it gives me an error when I try to open the images)
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Sulaiman
Sun Mar 24 2019, 01:49PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Just be aware that the fan that you pointed to is 4-wire ... external motor drive/controller required. (cheap via eBay)

Fans of this type are reliable Link2 and designed for various ready made ducting options.
An axial fan should suffice, bigger = less noisy, e.g.120mm should be ok.

From memory: MOTs become more efficient at 10% to 20% reduced operating voltage.
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MRMILSTAR
Sun Mar 24 2019, 03:43PM
MRMILSTAR Registered Member #62119 Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
The image feature has been broken for a while on 4hv.org. Hopefully it will soon be fixed.
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hyparh
Sun Mar 24 2019, 10:02PM
hyparh Registered Member #1054 Joined: Wed Oct 10 2007, 10:51PM
Location: Bulgaria
Posts: 29
Sulaiman wrote ...

Just be aware that the fan that you pointed to is 4-wire ... external motor drive/controller required. (cheap via eBay)


Isn't it like a PC fan? I mean, no matter how many wires they have, as soon as you figure out the two "main" ones, you can run it at full speed? I did this with many PC fans.



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The Lightning Stalker
Mon Mar 25 2019, 12:17AM
The Lightning Stalker Registered Member #4230 Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
Some microwave ovens have instead a centrifugal blower that flows more air than a standard rotary.
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