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 16th December 2004, 03:31 PM   #1
diyAudio Member
 
wigginjs's Avatar
 
Join Date: Dec 2003
Location: Columbia, SC
Default Opinions on a pair of transformers for a 6 channel gainclone

I'm thinking about buy two 21V-0-21V 400VA toriod transformers for my 6 channel gainclone project. I'll be using the BrianGT/PD LM3875 kits. This should produce about 31VDC after rectification. I'd like to get some opinions as to whether two of these transformer will provide enough current for all 6 gainclone and whether 31VDC is too high of a voltage to be using. I plan to connect 3 channels to each toroid. Please refer to the E-Bay link below to find out more about the transformers.


http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3859396322
__________________
The Four Chairs
DIY Home Theater
  Reply With Quote
Old 16th December 2004, 04:47 PM   #2
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
That's 800VA for 6 channels, so about 130VA per channel.

I always reckon that 80VA/channel is sufficient so you should be fine with 130VA!
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 16th December 2004, 06:20 PM   #3
diyAudio Member
 
BlackDog's Avatar
 
Join Date: Feb 2004
Location: Wellington, New Zealand
Default Re: Opinions on a pair of transformers for a 6 channel gainclone

Quote:
Originally posted by m0tion
I'm thinking about buy two 21V-0-21V 400VA toriod transformers for my 6 channel gainclone project. I'll be using the BrianGT/PD LM3875 kits. This should produce about 31VDC after rectification. I'd like to get some opinions as to whether two of these transformer will provide enough current for all 6 gainclone and whether 31VDC is too high of a voltage to be using. I plan to connect 3 channels to each toroid. Please refer to the E-Bay link below to find out more about the transformers.


http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3859396322

On my 6 channel Brian GT amp, I used 2 x 300VA 18V toroids. There's no shortage of current !!! If anything, I think my voltage may be a little low, so I expect yours would be about right..
  Reply With Quote
Old 16th December 2004, 06:42 PM   #4
diyAudio Member
 
wigginjs's Avatar
 
Join Date: Dec 2003
Location: Columbia, SC
Blackdog:

I'd be very interested in hearing some more details about your 6 channel gainclone. Have you already started a thread about it? Pictures would also be great =).
__________________
The Four Chairs
DIY Home Theater
  Reply With Quote
Old 16th December 2004, 07:07 PM   #5
diyAudio Member
 
BlackDog's Avatar
 
Join Date: Feb 2004
Location: Wellington, New Zealand
m0tion,

The amp is not 100% finished yet, although it has been in active service for about 6 months now. I was going to take some photos when it was fully complete, but for your sake, I'll try and get the camera out tonight (it's 9am in NZ right now).

Steve
  Reply With Quote
Old 16th December 2004, 10:51 PM   #6
kneadle is offline kneadle  United States
diyAudio Member
 
kneadle's Avatar
 
Join Date: Dec 2002
Location: Buffalo, NY
Send a message via AIM to kneadle
Quote:
Originally posted by m0tion
Blackdog:

I'd be very interested in hearing some more details about your 6 channel gainclone. Have you already started a thread about it? Pictures would also be great =).
Hear! Hear!

And how are you processing the surround encoding?

Dave
__________________
I have a small website for my projects.
  Reply With Quote
Old 16th December 2004, 11:16 PM   #7
diyAudio Member
 
BlackDog's Avatar
 
Join Date: Feb 2004
Location: Wellington, New Zealand
Quote:
Originally posted by kneadle

Hear! Hear!

And how are you processing the surround encoding?

Dave
Sorry kneadle, it's just a power amp with volume control. Surround decoding was considered far too time consuming. - I just use the 5.1 outputs on my DVD player.

Steve
  Reply With Quote
Old 17th December 2004, 03:11 AM   #8
kneadle is offline kneadle  United States
diyAudio Member
 
kneadle's Avatar
 
Join Date: Dec 2002
Location: Buffalo, NY
Send a message via AIM to kneadle
Yeah, but that actually makes sense. How do you explain that?
__________________
I have a small website for my projects.
  Reply With Quote
Old 17th December 2004, 09:27 AM   #9
diyAudio Member
 
BlackDog's Avatar
 
Join Date: Feb 2004
Location: Wellington, New Zealand
Default My amp -

I started a thread about my 6 channel amp.

Steve
  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
Top opinions for a pair of SB Acoustics SB29NRX75-6 10 Woofers Jimmy154 Multi-Way 26 31st December 2009 03:17 AM
Help identifying a pair of output transformers and power transformers mjk130 Parts 3 30th January 2009 10:44 AM
pass labs 'o' monoblocks: have seen a pair for 3k, request opinions. darshan Pass Labs 3 30th July 2003 12:21 PM
Pair of 625 VA Transformers - 2 * 42v @ 7.44A Jason Hubbard Swap Meet 1 7th March 2003 08:51 PM
Pair of 650/700VA Transformers, 30-0-30v Jason Hubbard Swap Meet 1 7th March 2003 08:50 PM


New To Site? Need Help?

All times are GMT. The time now is 07:43 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