Anyone with knowledge of capacitors?

Diggsy · 6 Jul 2011 at 22:39

Guys, I need to fix my Thomson Sky+ box (dodgy PSU caps) and so ordered some off the bay of e.

I needed some 8mm diameter x 16mm, but the guy sent 8x12 and 8x14 even though his auction said they were the correct size.

Anyway, they are the correct ratings etc, it's just the height that is wrong, so will they work, or am I asking for problems?

Thanks

Zefan · 6 Jul 2011 at 22:41

I'm no expert but I've studied my fair share of electronics. If they're the right rating then it should be fine.

andy_mk3 · 6 Jul 2011 at 22:42

Physical size makes no difference (as long as they fit). It's the ratings that matter. I replaced the caps in my PVR and they were slightly bigger but it's worked fine for over a year now

Diggsy · 6 Jul 2011 at 22:57

Thanks guys, might just give them a go then. They are definitely the correct ratings, one set are 16v 470uf and the other 25v 470uf, it was just the size that was putting me off.

EDIT - in fact, looking on Badcaps.net it would seem that I can use any height, and even higher (but never lower) voltage ratings. Interesting stuff

Baldbloke · 6 Jul 2011 at 22:58

Correct capacitance value and same or greater voltage rating should be ok. Ensure polarity is correct before soldering. (I assume these are electrolytics)

Edit ^ I see they are electrolytics

Diggsy · 6 Jul 2011 at 23:03

Baldbloke said:
Correct capacitance value and same or greater voltage rating should be ok. Ensure polarity is correct before soldering. (I assume these are electrolytics)

Edit ^ I see they are electrolytics

Thanks, and yep, they are radial electrolytics AFAIK... http://cgi.ebay.co.uk/16V-470uF-105-C-electrolytic-radial-Capacitor-X-10pcs-/120530218473

m3csl2004 · 7 Jul 2011 at 11:43

Make sure you get them the right way round, then double check!

Zefan · 7 Jul 2011 at 11:46

m3csl2004 said:
Make sure you get them the right way round, then double check!

This!

Diggsy · 7 Jul 2011 at 15:32

m3csl2004 said:
Make sure you get them the right way round, then double check!

Zefan said:
This!

yup, have already done a lot of checking to make sure I have this sorted, oh and loads of photos too, just as a failsafe

MikeHunt79 · 7 Jul 2011 at 16:10

As long as they physically fit theyll be ok.

m3csl2004 · 7 Jul 2011 at 16:18

Diggsy said:
yup, have already done a lot of checking to make sure I have this sorted, oh and loads of photos too, just as a failsafe

I've seen some pretty large caps go pop, during labs building AC>DC rectifiers, their is little chance of serious injury (unless it gets you in the eyes), but you and the surrounding area will look a nice powder white

Remember, the short leg with the stripe is negative, the long leg positive (I've done GCSE & A level electronics, just finished my 2nd year of EE at university and still googled this to double check

holidays

Diggsy · 8 Jul 2011 at 10:41

m3csl2004 said:
I've seen some pretty large caps go pop, during labs building AC>DC rectifiers, their is little chance of serious injury (unless it gets you in the eyes), but you and the surrounding area will look a nice powder white

Remember, the short leg with the stripe is negative, the long leg positive (I've done GCSE & A level electronics, just finished my 2nd year of EE at university and still googled this to double check holidays

Thanks a lot for the sound advice