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Re: De-Q-ing diodes
Original poster: "S & J Young" <youngs-at-konnections-dot-net>
Rob,
I use 40 1N5408s in series for de-Qing with my resonant charging setup (72
inch streamers) and they seem to do just fine. My max DC voltage is 12 KV.
I put mine on the power supply side of the reactor, hoping the reactor
filters out most of the high frequency pulses from the coil. The 1N5408 is
in essence a 3 amp version of the 1N4007, with slow recovery time. You
might consider using the more beefy 1N5408s - if you look around, you can
find them for a cost of not much more than the 1N4007s.
--Steve Y.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, November 30, 2003 9:29 AM
Subject: De-Q-ing diodes
> Original poster: Rob Maas <robm-at-nikhef.nl>
>
> Hi All,
>
> Recently Daniel Barrett wrote:
>
>
> >Original poster: "Daniel Barrett" <dbarrett1-at-austin.rr-dot-com>
> >
> > Gee, I feel like an advertisement for these things, but the 1N4007,
though
> >cheap, is a little slow for the 200uS-ish pulse from the coil. I
> >experimented with this a year ago and they are inefficient, get hot and
die
> >fast when used with anything but a 60Hz sine wave due to a very slow
reverse
> >recovery time. Better to use then UF4007 (A string of 50 for your
> >application). More expensive but will work as expected for higher
frequency
> >stuff like ignition coil rectifiers and DC Tesla coil "De-Q-ing" diodes.
Get
> >these from Mouser or similar. Digikey does not carry them.
> >db
>
>
> I was just planning to construct a de-Q-ing diode from a string of
1N4007's.
> Now I am worried. I thought a de-Q-ing diode basically 'sees' only as
highest
> frequency BPS_max, say 400-600 Hz ?
> Has anybody experience (good or bad) with using 1N4007's in such
applications.
> The UF4007 certainly is 'better' than the common 1N4007, but also MUCH
more
> expensive (I need at least 40...).
>
> Any reaction greatly appreciated, Rob Maas
>
>
>