Re: [drakelist] Smelly PS7

[w1id]

There are a couple of advantages in using several small caps in parallel over a single large cap. First,  equivalent series resistance is decreased and second, equivalent series inductance is likewise reduced. We do this all the time in designing DC/DC converters. Also, don't overlook the fact that modern electrolytics are much better than what was available back when the PS-7 was designed so replacing those old units is a good idea anyway. Gee I hope the old ones haven't leaked all over the inside of the power supply!  While you're at it, you might as well replace the smaller electrolytic, I think it's a 1,000 uf at the output..

 

-------------- Original message --------------
From: "Lars E. Pettersson" <[EMAIL PROTECTED]>

>
> "Lars E. Pettersson" <[EMAIL PROTECTED]>made an utterance to the drakelist gang
> ----------------------------------------------------------------------
> I have had my PS7 stored, unused, in a cupboard for a while, and
> recently noticed an unpleasant smell from it. I sniffed around the PS7
> innards, remembering the threads last autumn about smelly power
> supplies, and found the two 15000 uF capacitors to be the culprits.
> Perhaps time to change them out...
>
> Is there any reason for using two 15000 uF instead of one at, say 47000
> uF (the closest to 30000 uF I could find)
>
> Anyone have the dimensions of the original 15000 uF capacitors (do not
> have the PS7 available just now.) >
> I will probably go through all the electrolytic capacitors that are in
> there and change them all. They are probably at the end of their years.
>
> 73 de Lars, sm6rpz
> --
> Lars E. Pettersson <[EMAIL PROTECTED]>
> http://www.sm6rpz.se/
> ----------------------------------------------------------------------
> Submissions: drakelist@www.zerobeat.net
> Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body
> Hopelessly Lost: [EMAIL PROTECTED] - help in body of message
> Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net
> ----------------------------------------------------------------------