Parallel transformer wiring for Aleph30??? - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 5th February 2006, 08:46 PM   #1
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
Question Parallel transformer wiring for Aleph30???

I bought 2 Antek 2x22vac 400va transformers I'd like to use with BrianGT's mini-Aleph PSU board.

I've successfully hooked up the primaries and get 22vac at each of the secondaries.

My question: Is this the correct way to parallel these 2 400va transformers together for a single 22vac secondary with an 800va rating?

Thank you!

-David
Attached Images
File Type: jpg trafo-hook-up.jpg (19.5 KB, 345 views)
  Reply With Quote
Old 5th February 2006, 09:35 PM   #2
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
I would just 'dual mono' it with 2 bridges and 2 sets of cap banks. It'll keep you out of trouble and a dual mono 400va each chan on an aleph at those voltages would be better than needed. IMHO those trafos are not EXACTLY matched and they won't play equally in parallel (load share) as you would like.....

regards...

edit: oh...but your schem does seem to be correct if you wanted to..
__________________
Crazy Yankee.
  Reply With Quote
Old 5th February 2006, 10:16 PM   #3
tja is offline tja  Netherlands
diyAudio Member
 
Join Date: Feb 2004
Location: Leiden
Default Only one secondary?

What are you going to use for the other secondary?

Take
  Reply With Quote
Old 6th February 2006, 03:31 AM   #4
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
I was hoping to use a single powersupply with one bridge rectifier. Is this practical? The other option is to use 2 PSU boards, but given space limitations I was hoping to get away with only one.

Thank you,

-David
  Reply With Quote
Old 6th February 2006, 04:23 AM   #5
tja is offline tja  Netherlands
diyAudio Member
 
Join Date: Feb 2004
Location: Leiden
You need both +22V and -22V. The scheme you cooked up above delivers just one of them. If you want to use one bridge parallel each transformers secondaries and use one transformer for the positive side and one for the negative.

In the attached picture break connections at the red crosses, join the green connection and attach it to ground

Be sure to verify this with someone who knows a heck of a lot more than I do.

Take
Attached Images
File Type: jpg trafo-hook-up2.jpg (22.8 KB, 285 views)
  Reply With Quote
Old 6th February 2006, 01:31 PM   #6
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
Take is right..your orig. schem is wrong. But I think you would want it as below. I would still go dual mono or at least use 2 bridges and parallel the dc after the bridges.....
Attached Images
File Type: jpg trafo-hook-up.jpg (19.8 KB, 254 views)
__________________
Crazy Yankee.
  Reply With Quote
Old 6th February 2006, 04:09 PM   #7
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
Quote:
Originally posted by mpmarino
Take is right..your orig. schem is wrong. But I think you would want it as below. I would still go dual mono or at least use 2 bridges and parallel the dc after the bridges.....

mpmario and Take,

Thank you so much for your help!

I'm looking to get 22vac at the input of the rectifier. Would this design give 44vac or 22vac?

Thank you,

-David
  Reply With Quote
Old 6th February 2006, 07:26 PM   #8
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
44 vac total , or in other words, +-22vac referenced to the ground shown in my schem. If your building a traditional aleph 30 type amp you need about that voltage before rectification.

someone please flame me if i'm wrong so dw doesn't blow himself up.
__________________
Crazy Yankee.
  Reply With Quote
Old 7th February 2006, 12:23 AM   #9
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
I hooked it up as diagramed in post #1 and I'm getting +-15.6 volts after the rectifier. I was hoping to see 25vdc.

What's wrong here?

Thanks!

-David
  Reply With Quote
Old 7th February 2006, 12:52 AM   #10
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally posted by dw8083
I hooked it up as diagramed in post #1 and I'm getting +-15.6 volts after the rectifier. I was hoping to see 25vdc.

What's wrong here?

Thanks!

-David

you need caps after the bridge.
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  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
Wiring Power Transformer in Parallel kstylianos Tubes / Valves 5 7th June 2009 08:24 PM
Transformer wiring question, series, parallel and center tapped swin1 Power Supplies 12 7th November 2008 07:58 PM
parallel wiring 16 ohm 4 ohm tobler Subwoofers 3 21st November 2005 04:28 AM
I'm wiring my 4 channel 8 parallel LM4780 boards... check my wiring :) Audiophilenoob Chip Amps 9 16th August 2005 04:37 AM
Avel Lindberg 500VA 18-0-0-18 Transformer for Aleph30 BrianDonegan Group Buys 6 5th August 2005 02:40 PM


New To Site? Need Help?

All times are GMT. The time now is 09:36 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