Re: [CAD_CAM_EDM_DRO] backward transformer

I hooked up the caps and the transformer is now normal. Thank you very
much.

Harvey White wrote:

>
> On Wed, 16 Jun 2004 12:09:04 -1000, you wrote:
>
> >I have a large transformer that came out of a 48 volt power supply. It
> >has three output leads, the two center taps are hooked together, the
> >voltage reads 37.5 from center to either side and 72 end to end. however
> >when I hook up a 25 amp 250 volt bridge rectifier it reads 33.5 volts
> >center to end and 67.5 volts end to end. I thought the rectifier would
> >increase the voltage by 1.44. why is it going backwards?
>
> You need the capacitor to charge to peak voltage, otherwise, you get
> whatever your DC meter can read of a pulsating unipolar sine wave.
>
> This is based on vpeak of a sinewave is 1.414 * vrms. A lightly
> loaded supply (or no load) allows the capacitor to charge to peak
> voltage. A more heavily loaded supply will deliver less voltage.
>
> The typical meter will not read peak, but somewhere around an average
> dc value, less than that peak value. The capacitor makes all the
> difference, the meter will read what it will....
>
> Harvey
>
> >
> >
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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