To: rsgb_lf_group@blacksheep.org
Date: Wed, 15 Jul 2009 11:44:18 -0400
Message-ID: <20090715.114419.120.0.riese-k3djc@juno.com>
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From: riese-k3djc@juno.com
Subject: Re: Re: LF: Microwave oven transformers
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On Wed, 15 Jul 2009 14:57:11 +0100 "Alan Melia"
<alan.melia@btinternet.com> writes:
>  Hi all, I am very please to see not everyone sticks to a 12 volt 
> maximum
> supply voltage
> :-))
> 
> One though that occurs to me is that if one side of the MO 
> transformer is
> grounded in oven service........one ought to check that the winding 
> as a
> whole is sufficiently well insulated from ground to stand floating 
> 2kV above
> ground.

The one I use in DC service has the ground end lifted.  I have had no
problems
using this in a supply for my 2 meter amp. I series 2 for my Tesla coil
and have had
no problems either,,, I do find that it is amazing that they hold up well
just keep one hand in your pocket when messing about
the shunts do something to limit current and removing
is a simple process,, they make for a very good H V supply transformer

Bob K3DJC 


 There may not be the same clearance /insulation on the 
> grounded end
> of the secondary as the intended high-voltage end?? On the other 
> hand it
> might be quite OK. I have a certain cynicism about "consumer 
> designs".
> 
> Alan G3NYK
> 
> 
> ----- Original Message -----
> From: <dl4yhf@freenet.de>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Wednesday, July 15, 2009 2:34 PM
> Subject: Re: Re: LF: Microwave oven transformers
> 
> 
> These special transformers need the magnetic bypass because a 
> magnetron
> looks (as a load) like a Z diode.
> So they are powered, more or less, with a constant current source 
> rather
> than a constant voltage source.
> 
> In other words, the "generator" (transformer) must have a large 
> source
> impedance, and that's what the magnetic bypass in the 'former does.
> 
> Cheers,
>   Wolf .
> 
> 
> 
> 
> 
> 
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