Aleph 5 - 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 20th October 2003, 12:03 AM   #1
BillyD is offline BillyD  Canada
diyAudio Member
 
Join Date: Oct 2003
Location: Brampton
Question Aleph 5

Hi i started out building soz ,but i changed to aleph 5 i have a transformer 1005 va 50x4 sec will it work for aleph5?
__________________
BillyD
  Reply With Quote
Old 20th October 2003, 04:56 PM   #2
jonk is offline jonk  Canada
diyAudio Member
 
jonk's Avatar
 
Join Date: Feb 2003
Location: quebec
If they have a 240 primary, hook up your 120V to them and you'll end up with 4 x 25, which should be fine for an A5. You could use a choke input and use it for A2.
  Reply With Quote
Old 21st October 2003, 12:31 AM   #3
BillyD is offline BillyD  Canada
diyAudio Member
 
Join Date: Oct 2003
Location: Brampton
Default aleph5

Thank you Jonk, for your help. I would like more of your advice. I have dual 120vac primarys and 4x50vac secondarys. How can I make this work?
__________________
BillyD
  Reply With Quote
Old 21st October 2003, 05:04 AM   #4
diyAudio Member
 
Tieftoener's Avatar
 
Join Date: Nov 2002
Location: Coastal AL
To better explain what jonk was saying...

you can hook up 120 to the two primaries in series (instead of parallel)... this would get you 4x25 on the secondaries, which would work well with the Aleph 5.

Normally, you'd hook up 240 in series on the primaries and 120 in parallel on the primaries. So if you put half the voltage in series on the primary windings, then your output would be halved. Make sense?

Hope this helps -
__________________
Tieftoener -- You're ears can sense a movement in air that causes your eardrum to move less than 1/10th of the diameter of a Hydrogen atom! Don't abuse the one of the most amazing organs your Creator gave you!
  Reply With Quote
Old 21st October 2003, 05:12 AM   #5
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by Tieftoener
To better explain what jonk was saying...

you can hook up 120 to the two primaries in series (instead of parallel)... this would get you 4x25 on the secondaries, which would work well with the Aleph 5.
This is correct. My question is, wouldn't this cut the power rating of the transformer in half, due to the different wiring of the primaries? 500VA is still enough for a Aleph 5, but I am curious if it would reduce that power handling.

--
Brian
  Reply With Quote
Old 21st October 2003, 07:20 PM   #6
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
Brian you may be correct. Suppose a transformer was rated at 360 VA. For arguments sake lets assume it is a perfect transformer and it is loaded to the maximum 360 VA. The max primary current @ 120 volts with the primaries in parallel is 3 amps with each primary handling 1.5 amps. When putting them in series at 120 volts we are allowing 3 Amps to flow through each secondary. The question is, can the toroid's individual primaries handle the extra 1.5 amps. The same type of situation could be true with the secondary. If we have a full 360 VA draw on the seconday with a lower output voltage you will be drawing more current. The real question is if the windings on the primary and secondary can handle the extra current? If you know what guage wire the transformer was wound with you can easily guess but if not a call to the manufacturer will need to be made for the answer.
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 21st October 2003, 07:55 PM   #7
diyAudio Member
 
Tieftoener's Avatar
 
Join Date: Nov 2002
Location: Coastal AL
Good point on the wire gauges...

However, I think that the primary rating of a transformer has to do with the level of power that causes the core to reach saturation. In Avel Lindberg Y23 Series transformer specs, ALL the power class ratings (VA ratings) have the same core, regardless of the voltage. They weigh the same, the physical dimensions are the same, the termperature rise rating is the same, etc... With each different secondary output voltage in a power series (say, 625VA) the secondary current rating just lowers with respect to the secondary voltage going up. This translates to me as not changing the core, but only where the taps are made on the secondary. Below is a list of their specs:

625VA --> 25V+25V -- 12.5A --> (25*2*12.5=625)
625VA --> 30V+30V -- 10.42A --> (30*2*10.42=625.2)
.
.
.
625VA --> 60V+60V -- 5.21A --> (60*2*5.21=625.2)
625VA --> 115V+115V -- 2.72A --> (115*2*2.72=625.6)

So, all that said, I think that the current rating on BillyD's xformer will be double the original spec due to half the voltage output. Not sure if I'm 100% right - just speculating...
__________________
Tieftoener -- You're ears can sense a movement in air that causes your eardrum to move less than 1/10th of the diameter of a Hydrogen atom! Don't abuse the one of the most amazing organs your Creator gave you!
  Reply With Quote
Old 21st October 2003, 09:37 PM   #8
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
Tieftoener,

I think you are absolutely correct. I sell electronic test equipment for a living. I work for a large test and measurement company that begins with "T" and ends with an "X". As a matter of coinkydink I will be demonstrating an oscilloscope (second hint)for a power supply company tommorrow and will ask some questions so we can get the straight poop on the toroid question. Until tommorrow.....
__________________
-----------------------------------------------
Kilowattski
  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
Aleph (Single Ended) + Larvadin (no Memory Distortion) = Ultimate Aleph? tiefbassuebertr Pass Labs 19 25th January 2014 02:15 AM
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions tiefbassuebertr Pass Labs 13 27th April 2012 02:13 AM
Mini Aleph Board & Aleph 2 Parts List gpsmithii Pass Labs 3 16th January 2010 03:58 AM
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions tiefbassuebertr Pass Labs 0 6th August 2009 11:11 AM
PCBs for Aleph 2, Aleph 3, Aleph 4 and Aleph 5 amplifiers kristijan-k Swap Meet 64 12th September 2002 07:55 AM


New To Site? Need Help?

All times are GMT. The time now is 10:56 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