Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Gainclone Transformers
Gainclone Transformers
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
Thread Tools Search this Thread
Old 29th April 2007, 01:34 PM   #1
haziz is offline haziz  United States
diyAudio Member
Join Date: Apr 2007
Default Gainclone Transformers

I am building AudioSector's 3875 kit as well as Chipamp's (BrianGT) 3886 kit and will next tackle the 4780 kit. I am actually using this opportunity to gain experience in DIY. The PSU boards are AudioSector's and Chipamp's current boards which are different.

ApexJr has two Avel Lindberg amps on special:

1. Avel-Lindberg Inc.: Input: 2 X 120Vac 50-60 Hz 3 3/4" Dia X 1 1/2" Tall Output: 2 X 28.4V @ 2.67Amps over 150Va

2. Avel-Lindberg Inc: Input: 2 X 120Vac 50-60Hz 3 1/4" Dia X 1 1/2" Tall Output: 2 X 25V @ 2 Amps 100Va

I am also getting the cheap Signal transformers (Primary 230V Secondary 48VCT 7A & 28VCT 3A or Primary 115V Secondary 24VCT & 14VCT) that he has for experimentation.

Which do you recommend for the amp configured for dual mono driving 8 Ohm speakers? I may also want it to drive 4 Ohm speakers but 8 Ohm speakers are the main target. Cost is not my concern. Am I reading the instructions right that the 2x25V amp above would be a better match because of "rail voltage" and speaker impedance. I want to get the best match rather than just save a few dollars. Sorry most of the technical stuff is chinese to me, but I do want to learn.

I can also use a Plitron 300VA torroid for a stereo setup. Would this be a significant step up.



  Reply With Quote
Old 29th April 2007, 02:15 PM   #2
Ed LaFontaine is offline Ed LaFontaine  United States
diyAudio Member
Ed LaFontaine's Avatar
Join Date: Feb 2004
Location: where the Appalachians rise from the Blue Grass
My first choice of the options you have listed would be for the #2 transformer from Apex. Use 1 for each channel.
I have several of the Signal transformers. They work fine IF you set them up for 230V giving 48vct. This means you must have the voltage from a clothes dryer or electric range type outlet. Proceed with caution.
  Reply With Quote
Old 1st May 2007, 02:15 AM   #3
! is offline !  United States
diyAudio Member
Join Date: Jun 2005
Location: Midwest
If cost is no concern then the easy answer is none of the above, except you didn't tell us much about the 300VA option.

Generally you want about 2 x 22V / 4A or higher. The higher the current the better the regulation (all else being equal) Some people think about halving the curent when going dual mono, and it does give isolation but it also means peaks on one channel have less current reserve, more voltage depression than if it were a single transformer for both channels with double current.

150VA transformer will make a reasonable amp, but it is a bit smaller than some people use. You could use two of them but the main problem was still that to get that VA, the voltage is a little too high and the current a little too low. One x 100VA is not enough unless you aren't aiming for max output possible. IMO, you're better off having voltage a little high rather than not enough current.

At higher cost, consider this 2 x 22, 400VA
  Reply With Quote
Old 1st May 2007, 02:27 AM   #4
maxdd_nj is offline maxdd_nj  United States
diyAudio Member
Join Date: Dec 2005
Location: nj
Send a message via AIM to maxdd_nj
I use the Antek 22v+22v 400VA toroid '!' mentions in his post, in my Peter Daniel's premium 3875 amp. This thing's a hefty beast. It doesn't even get warm. The price is right too, go for it.
  Reply With Quote
Old 1st May 2007, 03:01 AM   #5
pjanda1 is offline pjanda1  United States
diyAudio Member
pjanda1's Avatar
Join Date: Jan 2005
Location: Boulder, CO
Avel makes a 22v+22v in several larger sizes too. Just call them up, they don't list them on their site. I use one of their 330VA 22+22's. However, I'm not sure they are any cheaper than the Antek on ebay.

  Reply With Quote


Gainclone TransformersHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Halogen lighting transformers for a Gainclone? Atilla Chip Amps 21 13th May 2014 12:48 PM
Favorite transformers for chip amp and gainclone? danielwritesbac Chip Amps 19 18th October 2008 07:09 AM
Is one 25.2A, 2A or two 12.6V, 3A transformers enough for gainclone? beady Chip Amps 8 11th July 2006 02:16 PM
Opinions on a pair of transformers for a 6 channel gainclone wigginjs Chip Amps 8 17th December 2004 09:27 AM
Not another gainclone!... transformers orbital Chip Amps 2 22nd April 2003 08:06 PM

New To Site? Need Help?

All times are GMT. The time now is 09:39 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio