to Low ESR or not to Low ESR, that is the ... ( was Re: GECKOS 201

This pops up occasionally.

LOW ESR or not for the 470 Caps. I have read more opinion that
engineering on this, and am still not exactly sure why the low ESR is
desired.

The availability between a simple alum electrolytic and a low ESR
make the alum much easier to get.

Does the low ESR offer any substantial benefits ?

Dave

--- In CAD_CAM_EDM_DRO@y..., "Dan Mauch" <dmauch@s...> wrote:
> I ran a test once. I had a G210 in one of my cases without the
cover on.
> I wireed the +36VDC and the ground up from the 18000 UF Cap without
a
> 470 UF 63V cap on the power lines. I was using about 12" of 18 AWG
> stranded wire. I ran the G210 for a while and noticed the internal
cap
> was getting warm. I shut it off and installed the 470 uf cap across
the
> G210 + and GND terminals. When I reran it the cap was now cool and
so
> was the 470 uf cap. So as you know heat kills electronics so I agree
> that the 470 UF Low ESR caps should be used on the G201/G210.
> Dan
>
> -----Original Message-----
> From: turbulatordude [mailto:davemucha@j...]
> Sent: Thursday, November 28, 2002 6:37 AM
> To: CAD_CAM_EDM_DRO@y...
> Subject: [CAD_CAM_EDM_DRO] Re: GECKOS 201
>
>
> Hi JAn,
>
> I do agree that the 470uF are worth the little effort to install.
At
> about 4 for a dollar, they are also worth their weight in gold.
>
> My understanding was that the line lenght between the 201 and the
> power supply allowed the main filter caps to handle the kickback
that
> was not handled on board the Gecko's. but, if the length was more
> than 18 inches, the 470's are required.