# Boardsort.com

Your complete E-scrap resource website. LEARN - SELL - PROFIT
 It is currently Thu Oct 17, 2019 2:24 pm

 Page 3 of 3 [ 25 posts ] Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: Old style Capacitors, Any value or junk?Posted: Mon Jun 24, 2019 5:32 pm

Joined: Mon Jun 24, 2019 5:27 pm
Posts: 1
LarryDavis wrote:
lostinlodos wrote:
You really need to check those capacitors on ebay or other places. Rubycon capacitors can go from $1 -$15 depending on the type of capacitor. Just an FYI; that post was many years old. I doubt they kept them this long. ;)
But who knows. :)

If you guys have them in large numbers, I'm interested in buying them all. But shipping costs may be the deterrent if you have small numbers of these capacitors.

I would like to buy this in large number if anyone is still interested in selling please let me know .

Top

 Post subject: Re: Old style Capacitors, Any value or junk?Posted: Thu Jun 27, 2019 5:03 am

Joined: Thu Jun 27, 2019 5:01 am
Posts: 1
JackarceSd wrote:
POG wrote:
You really need to check those capacitors on ebay or other places. Rubycon capacitors can go from $1 -$15 depending on the type of capacitor.

Other larger branded capacitors have similar value.

As with paper capacitors, the capacitance value of an electrolytic capacitor ?

Top

 Post subject: Re: Old style Capacitors, Any value or junk?Posted: Thu Jun 27, 2019 1:35 pm

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5779
Location: Low DOS
Quote:
As with paper capacitors, the capacitance value of an electrolytic capacitor ?

... Varying like stars in the sky.

_________________
-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.

Top

 Post subject: Re: Old style Capacitors, Any value or junk?Posted: Thu Jun 27, 2019 1:37 pm

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5779
Location: Low DOS
From Wikipedia
Mathematically, the self capacitance of a conductor is defined by
C
=
q
V
,
{\displaystyle C={\frac {q}{V}},}
where
q is the charge held by the conductor,
V
=
1
4
π
ε
0

σ
d
S
r
{\displaystyle V={1 \over 4\pi \varepsilon _{0}}\int {\sigma \,dS \over r}} is the electric potential,
σ is the surface charge density.
dS is an infinitesimal element of area,
r is the length from dS to a fixed point M within the plate
ε
0
\varepsilon _{0} is the vacuum permittivity
Using this method, the self capacitance of a conducting sphere of radius R is:[3]
C
=
4
π
ε
0
R

_________________
-- my grades are my own and do not represent an offer from boardsort, nor are they guaranteed. Please keep that in mind.

Top

 Post subject: Re: Old style Capacitors, Any value or junk?Posted: Thu Jun 27, 2019 1:59 pm

Joined: Tue Jun 19, 2018 4:52 pm
Posts: 129
albertocarpenter, what quantity do you consider 'large'?

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 3 of 3 [ 25 posts ] Go to page Previous  1, 2, 3

 All times are UTC - 5 hours [ DST ]

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

 Jump to:  Select a forum ------------------ Boardsort.com Help Forum Tested Chip Buying E-Scrap Forum General Discussion What is it? Identification Forum How to's, Tips & Techniques The Business Side Boardsort Reviews Other Recycling Discussions