RE: [CAD_CAM_EDM_DRO] Whither cheap power transformers these days?

Hi Paul -

I did just this with a 12VAC transformer to the 12V secondary
winding. The tapped primary windings (white/blue/purple and
grey/green/black) are for 120V, tapped for 100+20. Could you put
120V on the 100V section to get 52.5 out on the 43V secondary,
with a lower current capacity? I don't know very much about
transformers, so please let me know if I'm way off here.

BTW, I also bought a couple of transformers from Brian F.
(ka1bbg@..., on this list) that are 120V primary / 38+12
secondary, and good for about 10A. I'm actually going to use
these first since they have a higher rated voltage.

HTH,

Carlos Guillermo
VERVE Engineering & Design

-----Original Message-----
From: Paul R. Hvidston [mailto:paul_hvidston@...]
Sent: Monday, February 25, 2002 1:40 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Whither cheap power transformers
these days?

Carlos,

Thanks for the reminder. I'm now interested in your findings with
your big
transformer. From your earlier description, it sounds like the
white/blue/purple/gray/green/black are a pair of tapped primaries.
Like
others suggested, try connecting 12.6VAC to the brown leads and
measure the
primary leads to see if they're tapped for over or under 120
volts. I'd
really like to get a DC voltage just under 80 volts so I can
maximize my
steppers. That translates into about 56VAC on the secondary. The
best your
transformer could do is 43VAC and a full-wave rectifier (~60VDC)
UNLESS
games could be played with the taps on the primary. Keep us posted
on what
you find out.

Regards,

Paul R. Hvidston, N6MGN
ACKSYS Engineering
Upland, CA

----- Original Message -----
From: "Carlos Guillermo" <carlos@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, February 24, 2002 8:14 PM
Subject: RE: [CAD_CAM_EDM_DRO] Whither cheap power transformers
these days?


> Try Brigar Electronics. I just got a toroidal for $60 good for
> 43VAC at 20 A. Their catalog is online.
>
> Carlos Guillermo
> VERVE Engineering & Design