Re: blown Gecko - shorted output ?

That transformer is a multi-tap unit. from 9 volts to 45 volts
output in 8 steps, plus voltages inbetween and possilbly added on to
another.

Since I am looking for 30-35 VDC to the motors, I use the straight 24
VAC output.

Did check negitive of the DC side as the Gecko I am running works
fine and have not blown a cap on the Gecko Terminals. (470uF/50V)

the tall grey can is the big cap. seems I needed a wide tower case
to hold the transformer and a tower to have room for the cap.

Dave


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
wrote:

> Is that an isolation transformer, or an auto-'former? (DON'T use an
> auto-'former as a power supply). Make sure your DC bridge is set up

for the

> proper polarity, and make sure that ( - ) is 'ground'.
>
> RayHex
>
> ----------
> > From: turbulatordude <davemucha@j...>
> >
> > I may have not been clear.
> >
> > I have a 15 amp x-frmer, wired for 23 volts, 68,000 uF/100V cap
> > INSIDE of an old PC case.
> >
> >

http://photos.groups.yahoo.com/group/cad_cam_edm_dro/vwp?.dir=/Daves+U

> > nit&.src=gr&.dnm=68k+cap.jpg
> >
> > photo's-> daves unit-> 68k cap is a picture of it. when I started
> > putting it together.
> >
> > The PC and the power supply case both are grounded to the wall

outlet.

> >
> > I did find where on the Gecko's the stuff burnt.
> >
> > the large floating cap Radial lead, the end that is connected to

the

> > board, not the end connected to the axial cap.
> >
> > and a resistor labled 474 center of the board, opposite the
> > terminal. if you hold the board with the terminal away, it is

the

> > last resistor in the row nearest the center of the board, can

closest

> > to the board edge.
> >
> > no traces burnt so at least there is some faint hope.