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 22nd February 2009, 03:56 AM   #11
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
One of my Linn amps (Majik) uses a chipamp -- and it sounds wonderful -- driving biamped Kelidhs's.

Like so much else in life, don't knock it until you've tried it.
  Reply With Quote
Old 22nd February 2009, 05:41 AM   #12
JZatopa is offline JZatopa  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago
I don't think anyone is knocking chip amps, I think they are knocking the price. I can't believe that this is selling for $7500, I feel insulted somehow by that price. I may be in the wrong business, I should start selling t-amps in a CNC machined copper enclosure for $10,000. "The copper's magic allows the t-amp to produce it's lucid musicality" ROFL.
  Reply With Quote
Old 22nd February 2009, 09:27 AM   #13
CJ900RR is offline CJ900RR  Sweden
diyAudio Member
 
Join Date: Jan 2006
Quote:
Originally posted by DJNUBZ
I don't think anyone is knocking chip amps, I think they are knocking the price. I can't believe that this is selling for $7500, I feel insulted somehow by that price.
Would you buy a Class-A transistor amplifier for that price? I mean, its only power-transistors
  Reply With Quote
Old 24th February 2009, 02:16 AM   #14
sendler is offline sendler  United States
diyAudio Member
 
Join Date: Aug 2004
Location: ny
Default LM4702 application notes

Quote:
Originally posted by jaudio



LME49810 or LM4702
.

Now I found the nice application notes for the LM4702 which would also apply for the 49811.
.
http://www.national.com/an/AN/AN-1490.pdf
.
Great notes they put together for that chip. It actually discusses differences in the circuit based on listening! No wonder they fired all of those guys. We can't have any of that going on around here.
.
I will probably give those a try as well before I commit to boards for the 7250. But so far, it has beaten all comers.
__________________
Scott
  Reply With Quote
Old 24th February 2009, 07:51 AM   #15
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Sendler,

how about a 4-deck Jeff Rowland Model 12 with twelve LM3886T/Ch. for $14K, £14K, or €19.5K ?
Take a guess what the 2-decker with 10 chips cost overhere up till 5 years ago.
Attached Images
File Type: jpg jrdg-model12-2.jpg (66.1 KB, 999 views)
__________________
BOXES for crying out loud
  Reply With Quote
Old 24th February 2009, 12:26 PM   #16
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default Re: LM4702 application notes

Quote:
Originally posted by sendler

.

Now I found the nice application notes for the LM4702 which would also apply for the 49811.
.
http://www.national.com/an/AN/AN-1490.pdf
.
Great notes they put together for that chip. It actually discusses differences in the circuit based on listening! No wonder they fired all of those guys. We can't have any of that going on around here.
.
I will probably give those a try as well before I commit to boards for the 7250. But so far, it has beaten all comers.
Make sure you take a look at the nat semi thread -- as Bob Pease recommended a noise-gain compensation tweak which benefits the chips -- 4702 and its single cousin -- even further.
  Reply With Quote
Old 26th February 2009, 11:14 AM   #17
diyAudio Member
 
Join Date: Jul 2008
Location: Lviv
Interesting if it's possible to get the schematics of Jeff Rowland chipamps?
  Reply With Quote
Old 26th February 2009, 11:18 AM   #18
diyAudio Member
 
Join Date: May 2008
Quote:
Originally posted by AndriyOL
Interesting if it's possible to get the schematics of Jeff Rowland chipamps?
The next best thing.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 26th February 2009, 11:20 AM   #19
sendler is offline sendler  United States
diyAudio Member
 
Join Date: Aug 2004
Location: ny
Default The shine7 link shows a schematic

Quote:
Originally posted by AndriyOL
Interesting if it's possible to get the schematics of Jeff Rowland chipamps?
.
The Shine7 link in the first post shows his schematic which would be pretty close to the Rowland layout.
__________________
Scott
  Reply With Quote
Old 26th February 2009, 05:32 PM   #20
CJ900RR is offline CJ900RR  Sweden
diyAudio Member
 
Join Date: Jan 2006
Default Re: The shine7 link shows a schematic

Quote:
Originally posted by sendler

.
The Shine7 link in the first post shows his schematic which would be pretty close to the Rowland layout.

Except that the Jeff Rowland design is not inverted and therefore most likely doesn't have the same risk for some problems as the Shine7-design. And also the Jeff Rowland does not use DRV134 to bridge the two half's, as the DRV134 can also be a problem and is not suited for the job.

Note that I write "can". Many may not experience problem's but there is a possibility.
  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
Sansui G-7500 help needed 1978chevyman Solid State 3 15th April 2008 10:47 AM
sansui g-7500 pezza89 Solid State 0 15th April 2008 10:36 AM
Tuner Sansui Tu-717 & Tu-7500 oldmarantz Analogue Source 4 2nd November 2005 05:28 AM
Sansui g-7500? Jasmeleg Solid State 9 7th September 2005 08:36 PM
Onkyo DX-7500 Schematic culcanmar Digital Source 1 22nd February 2003 03:32 PM


New To Site? Need Help?

All times are GMT. The time now is 08:23 AM.


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