Trying to build Aleph 30 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 1st December 2015, 02:19 PM   #1
diyAudio Member
 
Join Date: Mar 2008
Default Trying to build Aleph 30

Hi,

I ever build this amp but lost after shifting house. I also forgotten many things about electronics in time. I had arranged parts for Aleph 30 including Transformer 18-0-18, signal generator and cheap Dso138 Oscilloscope.

I have completed one channel test board. it showing output 23v DC (somethings wrong), mesured Gnd + Output with multimeter DC Voltage no short in input.

I didn't use pot on R8 as it indicated 10m ohm should be fine if two input are not well matched. I have used matched mosfets. still checking for any wrong doing. Thanks
  Reply With Quote
Old 1st December 2015, 03:21 PM   #2
diyAudio Member
 
Join Date: Feb 2012
DC out 23v
There must be errors on parts.
Broken parts or maybe polarity reverse.

Double check, especially for the ztx and caps.
  Reply With Quote
Old 2nd December 2015, 10:26 AM   #3
diyAudio Member
 
Join Date: Mar 2008
Thanks. I found the problem. Mosfet IRF9610 damaged by soldering iron as it is not Grounded. How can i avoid such incident? any tips for soldering?
  Reply With Quote
Old 2nd December 2015, 12:51 PM   #4
wdecho is offline wdecho  United States
diyAudio Member
 
Join Date: Oct 2014
Quote:
Originally Posted by space2000 View Post
Thanks. I found the problem. Mosfet IRF9610 damaged by soldering iron as it is not Grounded. How can i avoid such incident? any tips for soldering?
You will find many good video's on youtube on soldering. The main thing to remember is that whatever you are soldering has to be hot enough to melt the solder. You do not melt solder onto the parts. The same can be said about welding or brazing. Clean your tip and apply a touch of solder to the tip every time is also good advice to get a good heat transfer.
  Reply With Quote
Old 2nd December 2015, 04:12 PM   #5
diyAudio Member
 
Join Date: Feb 2012
When soldering a sensitive parts,
I will always disconnect the solder ac plug.
Then quickly soldering the parts while it is still hot.
  Reply With Quote
Old 21st December 2015, 09:13 AM   #6
diyAudio Member
 
Join Date: Mar 2008
having problem. at first, I was using BC550 instead of MPSA18 and it was fine. i was thinking that should use MPSA18 as original diagram so purchased from online MPSA18 and changed the BC550. now it is showing output as a -volt. Thanks.
  Reply With Quote
Old 21st December 2015, 11:47 AM   #7
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Quote:
Originally Posted by space2000 View Post
having problem. at first, I was using BC550 instead of MPSA18 and it was fine. i was thinking that should use MPSA18 as original diagram so purchased from online MPSA18 and changed the BC550. now it is showing output as a -volt. Thanks.
The MPSA18 has a different pin-out than the BC550. (You need to
turn it around compared to the BC550.) Is it possible you did not
account for that?

Cheers,
Dennis
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 21st December 2015, 12:56 PM   #8
diyAudio Member
 
Join Date: Mar 2008
Thanks. I already checked Mpsa18, it is properly placed. across R123 should be 0.13v as design but mine is 0.03v. something is wrong.
  Reply With Quote
Old 21st December 2015, 02:33 PM   #9
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Is this the schematics you are referring to?

http://www.zen183332.zen.co.uk/Aleph/Aleph30.pdf

What voltages are you getting across say R118, R126 and R9? Any other voltages
seem weird?

Dennis
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 22nd December 2015, 05:16 AM   #10
diyAudio Member
 
Join Date: Mar 2008
voltage
R118 -0.38 (gnd to R118)
R126 +0.023 (-v rail to R126)
R9 3.75 (across)

Thanks.
  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
FS: Pass PCB's (F5, Aleph AJ-X, mini Aleph or Aleph 30) nycavsr2000 Swap Meet 2 3rd January 2015 12:15 AM
Aleph 30 build by diyaudio newbie NiklasJ Pass Labs 8 7th February 2012 12:11 PM
Transformer for Aleph 30 Build Peter Daniel's Boards eeyore Pass Labs 4 18th May 2011 11:03 PM
Sharing my build progress of the F4 and Aleph 30 eeyore Pass Labs 2 9th May 2011 01:42 AM
WTB: Aleph-mini PCBs and transistor set for Aleph 30 needtubes Swap Meet 4 6th November 2005 07:29 PM


New To Site? Need Help?

All times are GMT. The time now is 03:04 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki