Cheap Power Supply was Re: low cost drivers

Steve I see that you live in Barrie. Are you aware of Electrosonic
(highway 404 and steeles) they are the best source of electronics
in Canada. in the same area are Active electronics (shared parking
lot!) and across the street is Sayal electronic, a surplus/used
electonics store.

--- In CAD_CAM_EDM_DRO@y..., "StevenManzer" <smanzer@m...> wrote:
> I ordered the transformer and was surprised how fast it came up to
> Canada. If you purchase it, you will most likely want to connect
the
> secondary windings together (connect 0 to 28V) to obtain the 56VAC.
>
> The nice thing about this particular transformer is that it has
> several taps, there is a 14VAC tap that can be used for +12VDC or
> +5VDC power for logic or relay driving.
>
> I had trouble ordering the rectifier, but had little difficulty
> finding a replacement number from DigiKey. If anyone is
interested,
> I can look up the part number...
>
> Fortunately, I have access to capacitor hardware for mounting to
> chassis. This might be a consideration if you are building this
> power supply (it is a metal bracket that squeezes the cap firmly,
> while supplying mounting flanges to fasten to the case).
>
> For anyone new to electronics, I would highly recommend installing
a
> fuse on the primary side of the transformer.
>
> I am using the AC Connectors of an unused PC Power Supply so
standard
> computer power cables can be used with my controller.
>
> Hope this helps anyone building the supply.
>
> Steven
>
> --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...>
wrote:
> > Hi,
> >
> > I went to this link and noticed a 56 volt AC, 8A transformer for
> $20.
> > Add a 10,000 uF / 100VDC cap (DigiKey # P10040-ND $15.25 each),
a
> > 25A, 400VDC bridge rectifier (DigiKey # GBPC1506-ND $2.88 each)
and
> > you have a nice 75VDC @ 8A, 600W power supply for about $38. You
> > could do it for less if you got the cap surplus somewhere.
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., "rekmac" <rkonnen@t...> wrote:
> > > Thank you for the feed back, it is being very helpful. I still
> > > haven't firgured the higher voltage ,power resister thing yet
> > though.
> > > A couple of other things to ask or add. I found out the
steppers
> I
> > > have are Bipolar if I understand it right, 4 wire. What ideas
on
> > > drivers for these? Also found a place that may hay a good
source
> > for
> > > surplus and a good selection for power resistors. You have to
> call
> > > though, they don't list much on their site.
> > > http://www.skycraftsurplus.com/
> > > Thanks,
> > > Richard