Clipping vs Screwing Down Power Chips - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 4th December 2006, 08:38 PM   #11
diyAudio Member
 
Join Date: Feb 2004
Location: Racine, Wisconsin
http://www.aavidthermalloy.com/cgi-b...Search1=Search

Aavid MaxClips
  Reply With Quote
Old 4th December 2006, 08:40 PM   #12
Variac is online now Variac  United States
diyAudio Editor
 
Variac's Avatar
 
Join Date: Dec 2001
Location: San Francisco, USA
Nelson Pass uses the bolt with big washer method
  Reply With Quote
Old 4th December 2006, 09:13 PM   #13
diyAudio Member
 
Join Date: Feb 2004
Location: Racine, Wisconsin
I am rebuilding an Aleph because the screw washer thing loosened up on me. Ran good for a few hours then the thermal cycling got to the #6's. The FET's cooked off the board.
  Reply With Quote
Old 4th December 2006, 09:33 PM   #14
CarlosT is offline CarlosT  United States
diyAudio Member
 
Join Date: Oct 2006
As I pound the email/internet/phones to source these clips, I'm finding out that Aavid plays the proprietary game with the Max Clips and they're unobtanium. I'm trying to get some free samples but basically they want you to buy their extrusion.

However, for you folks near Bavaria, I found two vendors that had a very cool selection (better than Aavid) for clips.

Kunze (look for Powerclips)

http://www.heatmanagement.com/kunze/00english/

Fischer Elektronik

http://www.fischerelektronik.de/index.php?id=114&L=1

Of course, the distribution in North America is crap

Anyone close to these vendors willing to source some clips?

Danke schon!
  Reply With Quote
Old 4th December 2006, 09:34 PM   #15
Variac is online now Variac  United States
diyAudio Editor
 
Variac's Avatar
 
Join Date: Dec 2001
Location: San Francisco, USA
WoW!
  Reply With Quote
Old 4th December 2006, 10:55 PM   #16
diyAudio Member
 
Join Date: Feb 2004
Location: Racine, Wisconsin
Mouser has them...

532-MAXCLIP07 They are $0.18 each in quanity 10.
  Reply With Quote
Old 5th December 2006, 12:07 AM   #17
CarlosT is offline CarlosT  United States
diyAudio Member
 
Join Date: Oct 2006
Yeah but these are the ones that go with the Aavid Max Clip heatsinks. They don't carry the CLP212G...the over the edge more universally useful clip.
  Reply With Quote
Old 5th December 2006, 12:16 AM   #18
diyAudio Member
 
falcott's Avatar
 
Join Date: Jul 2004
Location: Wherever I hang my hat...
Quote:
Originally posted by chipco3434
http://www.aavidthermalloy.com/cgi-b...Search1=Search

Aavid MaxClips

Now that's what I was talking about. Are they big enough for an LM3875 chip, I wonder? I haven't measured yet...
__________________
"Everything should be made as simple as possible, but not simpler." - Einstein
  Reply With Quote
Old 5th December 2006, 10:41 AM   #19
diyAudio Member
 
Join Date: Feb 2004
Location: Racine, Wisconsin
yup
  Reply With Quote
Old 5th December 2006, 05:41 PM   #20
diyAudio Member
 
DCPreamp's Avatar
 
Join Date: Jun 2005
Location: Sacramento, CA
Default Clip Alternatives

In the spirit of DIY'ing, and to hopefully spur creativity, here is a technique I've seen for clipping down power transistors.

Try using regular old, store-bought (Office Depot or virtually any place that sells office supplies) heavy-duty paper clips. The medium ones measure about 1.25" wide, 0.75" tall, and will open up to 0.5". The large ones measure about 2" wide by 1.33" tall and will open up to about 1". Sounds crazy, I know, but they are commonly available, made of good quality spring-steel that retains its properties at 85 degrees C, includes the wire clips for installation/removal (which can be removed by pinching them), and are very cheap.

The medium one can easily retain 2 x TO-220 or TO-218 devices, or 1 x chip amp. It can also hold those devices against aluminum up to 3/8" thick. I haven't used the large ones, but imagine they can hold multiple power devices or a couple chip amps against (up to) 3/4" aluminum.

I have used this mounting method for a prototype car amp with flawless results. The pressure is constant and so long as the aluminum is the correct height and thickness, mounting takes seconds. I first saw this method used on a motor controller that used 4 x "paper clips" to hold 8 x power FETs. At first I thought it was silly and ineffective, but quickly realized it was extremely practical and very effective.

These clips can be used with very large heatsinks as long as large "L" or even "U" shaped aluminum channel with the channel thermally secured to to the heatsink.

Anyway, hope this helps or provides some alternative ideas.
__________________
"Believers cling to the myth despite the evidence, reinterpret the myth to suit the evidence, or lie about the evidence to support the myth." "To err is human; to blame errors on external factors is even more so."
  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
Screwing: Just say no? brucegseidner Multi-Way 25 17th July 2009 03:22 AM
Pre-clipping as a method of power regulation bkoopman Class D 0 1st May 2008 06:18 AM
Clipping and amp power supply digitaldisaster Chip Amps 3 3rd September 2007 03:53 AM
Clipping - power supply? digitaldisaster Subwoofers 1 1st September 2007 10:10 PM
Power Amplifier Clipping Indicator widi Solid State 2 1st March 2007 02:50 AM


New To Site? Need Help?

All times are GMT. The time now is 05:07 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