Re: [TCML] 833A VTTC schematics

[Carl Noggle <cn@xxxxx>]

People planning to criticize posts should be sure that they have 
adequately researched the issue.  The writer missed the fact that the 
833 is the other diode.  This whole post is LTB (like totally bogus) 
except for the statement about adequate cooling and the one about having 
fun.  Also, a full wave supply would give more continuous operation, 
which is not important in a microwave oven.

Whoever wrote this post needs to think before he writes.  (Oooooops, I 
guess that's me.)

---Carl



> Hi---
>
> I checked out the schematic, and wondered how I could have missed a 
> voltage doubler circuit with only one diode.  I simulated it in MicroCap
> and found that it didn't work.  It's missing a diode in the upper lead 
> from D1 to C7.  That will form a half-wave voltage doubler, but I 
> suggest using a full-wave doubler as in:
>
>      
> http://www.google.com/imgres?q=full+wave+voltage+doubler&um=1&hl=en&safe=off&client=firefox-a&hs=0a3&sa=N&rls=org.mozilla:en-US:official&biw=1680&bih=909&tbm=isch&tbnid=yRKzukbRgcG8uM:&imgrefurl=http://sound.westhost.com/power-supplies.htm&docid=tvEHY89b4A2fxM&imgurl=http://sound.westhost.com/psu-f7.gif&w=640&h=220&ei=qWG7Ts3cA8qViALIooSHAg&zoom=1&iact=hc&vpx=623&vpy=165&dur=494&hovh=87&hovw=225&tx=188&ty=78&sig=106653913807423328229&page=1&tbnh=87&tbnw=225&start=0&ndsp=42&ved=1t:429,r:2,s:0
>
> Why on earth do they need a URL that long?
>
> Anyway, the full wave VD has a 120 Hz ripple frequency instead of 60 
> Hz for the half-wave, making it smoother DC for the same filter cap.  
> Caps C5 and C7 should be a couple microfarads instead of nanos.
>
> You might also look into reducing the size of the parasitic traps in 
> the plate leads.
>
> Be sure to have adequate forced-air cooling of the tubes, especially 
> the seals.
>
> Have fun.  833s are cool.  No, they're hot.  Well, you know what I mean.
>
> ---Carl
>
>
>
>
> > I have acquired (2) 833As. I have looked at several VTTC schematics, I
> > am leaning towards Dans
> > http://www.easternvoltageresearch.com/resources/vttc833a_fullschematic.pdf 
> >
> >               This will be my 4th coil, but my 1st VTTC. Any advice,
> > suggestions, or warnings would be welcome.
> >
> > Thanks Wm A Tickhill  (aka Hairball)
> > _______________________________________________
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>
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