Re: Power Supply Question.

You might check out your power transistors. They are usually blocks
with three leads out one end and a metal flange with a hole on the
other. The flange is to connect to a heat sink. They useually get
hot and need a heat sink. The metal box/enclosure is often used for
this purpose.

Be carful as somtimes the flange is connected electically to the one
of the pins. They make a nylon washer wiht internal sleave, nut and
bolt and a nylon or mylar spacer for these guys.

Check the manufactureres data sheet for the part. www.findchips.com
for the part number, then if Digikey has the part, copy the part
number and go to the manufacturer's link and you should be able to
get data sheets.

A simple stand off bracket is to use nylon nuts and bolts. just make
sure that the soder tips don't touch any metal.


Dave

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <jmelson@a...> wrote:
>
>
> andesign2@y... wrote:
>
> > I am in the process of making my own power supply for Dan's 5 Amp
> > driver boards. So far I have purchased all the components to
> > assemble a supply similar to the one that is shown in Dan's
manual.
> > It has now come time to assemble all of the components to make the
> > supply and I have a couple of questions. First of all do I need
to
> > isolate the metal feet of the transformer from the case which will
> > house all the components.
>
> No, the transformer housing should be grounded for safety and
isolation
> reasons.
>
> > On the same note do I need to isolate
> > everything (driver boards,
>
> Probably not, the circuitry is most likely isolated from the
mounting holes.
>
> > capacitor, bridge rectifier, db25 interface) from the case?
>
> No to all 3.
>
> Jon