[BBC-Micro] Suitable capacitor replacements

Philip Pemberton philpem at philpem.me.uk
Tue Oct 5 12:39:45 BST 2010


On 03/10/10 14:02, Mark Usher wrote:
> 250V-SH
> 0.01uF X2 a
> PME 271M
> 40/086/56
> CU0
> 565-1 LD2
> Pitch 15mm

That's a Class X2 capacitor, 10nF, used for live-neutral filtering.

> 250V-SH
> 4700pf Y b
> PME 271-Y
> 40/085/56
> CU9
> 565-1 LD2
> Pitch 10mm

That's a 4700pF (4.7nF) Class Y capacitor. Used for live-earth filtering.


For the first one, I'd go with:
Farnell P/N: 1166441
VISHAY BC COMPONENTS - BFC233840103 - CAPACITOR, CLASS X2, 10NF, 300V

This is basically the only 15mm pitch 10nF X2 cap that Farnell have in 
stock at the moment.


And for the second one:
Farnell P/N: 1006064
WIMA - MP3-Y 4700PF +/-20% 250V - CAPACITOR, CLASS Y, 4.7NF

Again, only one in stock with the same pin pitch.


If those capacitors are doing what I suspect they're doing, you can 
probably remove them and run the PSU without them. Expect the EMC 
performance to be VERY nasty afterwards though -- i.e. don't expect your 
AM/FM radio to work properly when located near a BBC or Filestore with 
missing PSU filter caps :)

-- 
Phil.
philpem at philpem.me.uk
http://www.philpem.me.uk/



More information about the bbc-micro mailing list