Re: resistor for power supply

JanRwl@A... wrote:

Hi Jan,

> This is "theoretically" necessary when
> the CAP is very, very large, and the
> efficiency of the rectifier is 99%

> example, if a C has "68,000 uF" stamped on it,
> it may-well have a practical
> actual capacitance of 100,000 uF. Even more!

15,000 - 20,000 uF seem pretty big to many. I have connected my PS
(15,000uF)without a current-limiting resistance and it worked fine.
Seems in the long term it is not too good for the system.Don't have
enough experience or knowledge to judge if that is a fair assessment
of the situation.

BTW it seems that 15,000 uF is too large for the requirement (3 2Amp
steppers) and one can do with much smaller cap. In fact I have seen a
3-axes driver where the capacitor (physical size, don't know about
uF) was 10% of that 15,000uF cap on mine.

Many thanks to Bob, Jan, etc

Troll Jr.