Re: Yet another power supply question

Hi Mariss,

> (2) It makes no difference whether the transformer is torroidal
> or "E,I" core (standard transformer). Use whatever gives the

required

> current at the voltage you need. A 24V (RMS) secondary is a good
> choice.

My consideration for the torroidal trasformer is size. This may not
be an issue yet but I would like to know what a comparable one would
be.

> (4) A 50VDC rated cap is the correct, most economical choice. The
> capacitor is what is called an aluminum electrolytic. Use the kind
> that have the two threaded (10-32) terminal posts. Be sure to mind
> the polarity. One post will be marked with a "+" sign, make sure
> the "+" output of your bridge rectifier goes there.

Any brand recommendation? I searched a couple of online shops but I
cannot tell what the terminals are.

> (5) Use a 25A 100V rated bridge. They cost just about the same and
> will run a little cooler. Use a little heatsink compound underneath
> it when you mount it to the chassis.

What case style will this be for chasis mounting? I'm amazed at the
huge number of variations of the electronics.

> (6) Use as heavy or heavier wire guage as what your transformer

leads

> are. Stranded wire of course. Use two different wire colors to go

to

> the drives. Red for "+", black for "ground". If you can't, use a
> lighter color for "+". This will avoid mixing the two up and
> destroying the drives.

Ok ok I'm not THAT electronicly challenged. I work in the
construction industry and I'm always amused when some EE attempts to
do some household wiring and can't understand what the white wire is
for and why the breaker keeps tripping because the black wire is
connected to the ground. Thanks for the info.

Jay