Aleph 30 power supply - 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 28th September 2007, 11:09 AM   #1
diyAudio Member
 
Join Date: May 2005
Default Aleph 30 power supply

I built an Aleph 30 and it works ok. The power supply as a 300 watt torroid 2x18v (ac). I should have about 25V after the rectifier bridge, however, when measured with the multimeter I get 17 v (ac) and only 20,5 V (DC). The current is 5Amp and have 6 capacitors of 15000 uF

Is it normal to get nearly 3,5 volts across the rectifiers (datasheet says 1,2V)? What could be wrong?
  Reply With Quote
Old 28th September 2007, 02:41 PM   #2
traw is offline traw  United States
diyAudio Member
 
Join Date: Sep 2005
Putting a beating on the transformer 5 amps of 8 (300va /36) so will sag 10-15%. I bet that transformer will get mighty warm.

Any losses across CRC?

I used 500va, 20x2 on aleph30.

Rule of thumb is 1.2 rather than 1.41 in these heavy current loads.
  Reply With Quote
Old 28th September 2007, 04:47 PM   #3
diyAudio Member
 
Join Date: May 2005
Traw
Thanks for your reply
You must be right, i have to change the torroid. It gets fairly warm, nothing to worry about but +- rails are on the short side, only +-21V
Across CRC, only 0,5V ... i use a 0,1 ohm resistor.

Well, another transformer for a chipamp iím working on
  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 P.17 Power Supply Bengali Pass Labs 6 6th October 2008 06:24 PM
aleph 1.7 power supply jarthel Pass Labs 8 29th June 2007 04:20 PM
Aleph X power supply Mach_Y Pass Labs 42 29th March 2004 08:43 PM
Aleph-4 Power Supply needs help ruangrit Pass Labs 1 25th January 2004 05:38 AM
Aleph 5 Power Supply martinschki Pass Labs 66 25th January 2003 06:34 AM


New To Site? Need Help?

All times are GMT. The time now is 05:58 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