RE: [TCML] Tuning, Capacitors, and Spark Gaps

["chuck" <asimov@xxxxxxxxxxxx>]

Verrrry interesting. Is there a schematic online which uses MWO caps? I have
a few MOTs and a box full of MWO caps. It would be nice to use them for
something.

Chuck
Hannawa Falls, NY
(between the Amish and the Mohawks)



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of DC Cox
Sent: Sunday, August 23, 2009 12:31 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Tuning, Capacitors, and Spark Gaps


Useful for HV DC filter caps.  Also commonly used for voltage doubler
circuits.  With each mot producing 2 kV Erms (on the average) , and the
microwave tube requiring 4-5 kV, most mots employ a voltage doubler circuit.
With rectification it gets the DC potential up to approx 5.6 kV DC.

Some Tesla experimenters run their coils on direct current, so the 5.6 kV
gives a respectable potential to fire the spark gaps.

If you use the mots with a rectifier, or a voltage doubler circuit, be sure
to provide for adequate bleeder capacitors on the caps to prevent powerful
shocks.

Dr. Resonance




On Sat, Aug 22, 2009 at 5:04 PM, chuck <asimov@xxxxxxxxxxxx> wrote:

> I have nothing useful to provide here but I have another question to 
> add to Joel's list. What are those HV caps in a microwave oven useful 
> for anyhow? Every time I harvest another MOT I also keep the cap, just 
> in case. Is the clutter worthwhile?
>
> Chuck
> Hannwa Falls, NY
> (motto: get me the hell out of here!)
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On 
> Behalf Of Joel Torgeson
> Sent: Saturday, August 22, 2009 6:19 PM
> To: Tesla Mailing-list
> Subject: [TCML] Tuning, Capacitors, and Spark Gaps
>
>
> Alright,
>
>     I've now built my tesla coil, and am very disappointed that it 
> fails to work. My transformer is a 9,000v 30ma NST. I have 
> tailor-built my capacitor out of capacitors from microwave ovens. They 
> are internally resisted, and with 80 of them in series i hit my target 
> capacitance of .0088 uf. My primary consists of 1/4 inch copper tubing 
> spaced 1/4 inch between each winding. there are 15 turns of tubing in 
> a flat pancake configuration. My secondary consists of approximately 
> 760 feet of 24 AWG magnet wire wrapped around 3.26 inch outside 
> diameter PVC pipe. The topload is of the tubing and pie-pan variety, 
> using 3 inch aluminum tubing/ducting. This makes a ~ 15 inch toroid on 
> the top. i am using a 8 ft grounding rod that isn't attached to 
> anything important. There is no metal inside the secondary, so that 
> isn't a problem. My biggest concern is the spark gap. It's a static 
> gap, not split
> up into multiple gaps, just one big one. it is 5.6mm wide, and has a  hair
> drier running on cool temp, high velocity blowing on it for quenching.
>
>     There's all the numbers i have, now i need some advice. I have 
> been trying to tune it in for 2 days, and all i can get is the 
> occasional 3/4 inch spark (usually no more than 1/2 in for rapid 
> sparks). It does light up a broken fluorescent bulb, and as i said, it 
> makes some small sparks, but i didn't spend all that time and effort 
> to create something my Van de Graaff can beat!
>     So, does anyone see anything obviously wrong? Any suggestions, 
> comments, tips, or (yes) criticisms would be much appreciated.
>
>  Sincerely,
> Joel Torgeson
>
>
>
>
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