Difference between 3 pin and 2 pin capacitor - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th September 2001, 08:52 AM   #1
swede is offline swede  Switzerland
diyAudio Member
 
swede's Avatar
 
Join Date: Sep 2001
Location: Geneva, Switzerland
Hi,

On http://www.brigarelectronics.com/Mer...tegory_Code=CG I found a three pin capacitor.

What is actually the difference? Can I use it in a powersupply?

Sorry if I'm stupid, but I've never seen a three pin cap. before.

Have a good one,
//magnus
  Reply With Quote
Old 26th September 2001, 03:19 PM   #2
tvi is offline tvi  Australia
diyAudio Member
 
tvi's Avatar
 
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
You will most likley find the third pin is left unconnected, they are their to stop such a big cap from pulling out one of the other pins during times of mechanical stress, shipping etc.

Hopefully the cap is marked, I had some ROE caps with 4 legs, 2 were dummy pins but the Cap had no marking as to what were what, most annoying


<font size="+0" color="#008080" face="timmons">Regards
James</font>
  Reply With Quote
Old 26th September 2001, 04:12 PM   #3
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
magnus,
Another possibility, although I can't tell from the picture, is that the can actually contains two capacitors. I have a number of caps on hand that have a common ground and two or more pins for seperate caps in the same casing. It's not as common as it used to be, but there are still some to be found.

Grey
  Reply With Quote
Old 25th October 2002, 01:32 PM   #4
diyAudio Member
 
Join Date: Jan 2002
Location: Sweden
Send a message via ICQ to Christian
I've juste got two caps out of an older amp, and they to have 3 pins! It seems that ground is common, and it charges on both the other pins, but there isn't really a way of checking that it charges correctly, is there??

Isn't marked in any special way, just says 44V 6800 microF

/Chris
Attached Images
File Type: jpg caps3pin.jpg (89.8 KB, 289 views)
  Reply With Quote
Old 25th October 2002, 02:15 PM   #5
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Default 3.rd pin

Hello!

I have some of them in my bin as well.

The 3.rd pin is often reffered to as a locating-pin, and is
just that, a dummy.- (and might help secure the cap).

Arne K
  Reply With Quote
Old 25th October 2002, 04:11 PM   #6
diyAudio Member
 
Join Date: Jul 2002
Location: Netherlands
Send a message via MSN to Tazzy
My Zen V4 features a trio of 5 pinned Caps for each channel
  Reply With Quote
Old 25th October 2002, 04:55 PM   #7
G is offline G  United States
diyAudio Member
 
G's Avatar
 
Join Date: Apr 2002
Location: Belleville, IL.
Alright Taz! Where are the pictures of the Zen V4 on your website? Just to add to this thread I have found some 3 pin "computer grade" caps. The third pin is definately just for mechanical integrity. It should have no electrical connection. If it were a two section cap it would be MUCH larger.

G
__________________
Gavin
  Reply With Quote
Old 25th October 2002, 05:42 PM   #8
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Default three pins

I think it is usually to keep the cap from being installed in a PCB with the wrong polarity. This happens with two pin caps on occasion with spetacular results on power up.

KABOOM,
Fred
  Reply With Quote
Old 25th October 2002, 05:59 PM   #9
diyAudio Member
 
Join Date: Aug 2001
Location: Bath, UK
All,
Although the capacitor in the link undoubtly has an extra dummy pin, three pin caps exist for supression circuits. The usual "delta" configuration consists of two class-Y caps between the hot terminals and earth with a third class-X cap connected between the two hot terminals.

Here's a datasheet with a connection diagram:
http://www.evox-rifa.com/cap_catalog...emi/pzb300.pdf

Nice one,
David
  Reply With Quote
Old 25th October 2002, 06:36 PM   #10
diyAudio Member
 
Join Date: Dec 2001
Location: Philadelphia
Default Third pin

I got a few of those caps from Brigar. The third pin is only for mounting. It makes the cap stable (eliminates wiggling) as well as acting as polarizing pin as Fred said.

For my case, I mounted them upside-down with hot melt glue, and ground off the third pin to avoid shorting anything with my connections.
__________________
Vince Harris
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
I'm anti-expensive audio parts but man, a good capacitor can make a difference jduffy Tubes / Valves 6 25th April 2007 04:13 AM
I2C/I2S,what's the difference??? Leolabs Parts 2 18th April 2005 01:20 PM
Difference btw SE and PSE. protos Tubes / Valves 61 13th January 2004 06:03 PM


New To Site? Need Help?

All times are GMT. The time now is 06:18 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2