Boardsort.com

Your complete E-scrap resource website. LEARN - SELL - PROFIT
It is currently Thu Jul 18, 2019 6:47 am


Post new topic Reply to topic  [ 25 posts ]  Go to page Previous  1, 2, 3
Author Message
PostPosted: 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
 Profile  
 
PostPosted: 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
 Profile  
 
PostPosted: Thu Jun 27, 2019 1:35 pm 
Site Admin
User avatar

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5466
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
 Profile  
 
PostPosted: Thu Jun 27, 2019 1:37 pm 
Site Admin
User avatar

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 5466
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
 Profile  
 
PostPosted: Thu Jun 27, 2019 1:59 pm 

Joined: Tue Jun 19, 2018 4:52 pm
Posts: 115
albertocarpenter, what quantity do you consider 'large'?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 25 posts ]  Go to page Previous  1, 2, 3

All times are UTC - 5 hours [ DST ]


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

Jump to: