Re: [TCML] Pulse Cap question

["Teslalabor" <teslalabor@xxxxxxxxxxx>]

Hi Matt,

so you would say, this cap isn't the best for tesla use? Not as good, as 
good old Maxwell caps are for example?
In particular, this is a special capacitor from US manufacturer 
"Hipotronics", it has 7 single caps in one big metal housing, which can be 
connected in parallel. The cap is rated as follows:
40kV
7 x 0.03µF
300pps
4.5µsec

I think it comes from a pulse forming network, powering a big magnetron or 
such things. The cool thing with this cap would be, you can easily 
increase/decrease the capacitance in 30nF steps by simply tapping 0-7 
capacitors.
Regards,
Stefan


----- Original Message ----- 
From: "mddeming--- via Tesla" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, October 22, 2014 11:30 PM
Subject: Re: [TCML] Pulse Cap question


> Hi Stefan,
>
>
> Usually, this is the discharge time into essentially a dead short, not the 
> time of one oscillation. One cycle consists of charge-discharge-reverse 
> charge-discharge. Therefore, the the minimum time for one cycle would be 
> not less than four times this, limiting the oscillating frequency to 
> something less than ~55.5 kHz. Trying to operate above this frequency will 
> result in high heat dissipation and very fast damping of voltage. The 
> internal resistance may even be high enough to prevent oscillation 
> altogrther.
> Matt D
>
>
>
>
> -----Original Message-----
> From: miles waldron <mileswaldron@xxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Wed, Oct 22, 2014 4:28 pm
> Subject: Re: [TCML] Pulse Cap question
>
>
> Probably discharge time. It can take 300 discharges per second, and each
> discharge elapses in 4.5 microseconds.
>
> On 10/22/2014 11:31 AM, Teslalabor wrote:
> > Hello,
> >
> > the nameplate of a pulse cap says the following:
> >
> > 40kV
> > 4,5µs
> > 300pps
> >
> > So it's rated at 40kV, 300 pulses per second, but what does 4,5µs stand
> > for? Is this the maximum ocillating frequency, the caps can withstand? f
> > = 1/T = 1/4,5µs = 222kHz?
> >
> > Regards,
> > Stefan
> > _______________________________________________
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> > Tesla@xxxxxxxxxx
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