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

Pass Labs This forum is dedicated to Pass Labs discussion.

Aleph 5 based on BrianGT boards
Aleph 5 based on BrianGT boards
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 30th October 2018, 01:11 PM   #1
Nohabla is offline Nohabla  Norway
diyAudio Member
 
Join Date: Feb 2007
Location: Norway
Send a message via AIM to Nohabla Send a message via MSN to Nohabla Send a message via Yahoo to Nohabla
Default Aleph 5 based on BrianGT boards

Hi,

A long time ago i bought one set of aleph boards from Chipamp. I am now in the process of finishing them.

I have populated the boards as per the "Brians PCB Aleph - parts list" see attachment. I cannot remember where i got the parts list, perhaps from Chipamp.com before it closed..

It is a dual mono config with 2x25vac Toriods.

These are my findings when power voltage is +/-34 vdc from PS:
The output transistors does not heat up, just 2,2mv across R40 and even less on R39.

Q1, 2, 3 does heat up.

Voltage over z5 = 9V
Voltage over R8 = 5,2V
Voltage over R18 =3,3V
Q5 Gate to source =1,6mV
DC on output = 96mV

Any thoughts?
Appreciate all input
Attached Images
File Type: jpg BOM.JPG (181.9 KB, 270 views)
  Reply With Quote
Old 30th October 2018, 02:19 PM   #2
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Aleph 5 based on BrianGT boards
schm, pics

pretty please
__________________
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
Old 30th October 2018, 02:19 PM   #3
Dennis Hui is offline Dennis Hui  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Aleph 5 based on BrianGT boards
Can you link/post a schematics for your board?

Edit: Mighty Zen Mod beat me to it.
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 30th October 2018, 02:53 PM   #4
Nohabla is offline Nohabla  Norway
diyAudio Member
 
Join Date: Feb 2007
Location: Norway
Send a message via AIM to Nohabla Send a message via MSN to Nohabla Send a message via Yahoo to Nohabla
Her's a schematic i picked up in another thread and pics.

Thanks for looking
Attached Images
File Type: jpg passA5overview.jpg (659.4 KB, 247 views)
File Type: jpg passA5.jpg (652.5 KB, 242 views)
File Type: jpg briangtboard.jpg (976.0 KB, 235 views)
Attached Files
File Type: pdf miniasch.pdf (29.7 KB, 57 views)

Last edited by Nohabla; 30th October 2018 at 03:23 PM.
  Reply With Quote
Old 30th October 2018, 07:31 PM   #5
Dennis Hui is offline Dennis Hui  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Aleph 5 based on BrianGT boards
Your voltage across R18 looks low. Are your Q1, Q3 IRF9610 devices matched?
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 30th October 2018, 09:18 PM   #6
Nohabla is offline Nohabla  Norway
diyAudio Member
 
Join Date: Feb 2007
Location: Norway
Send a message via AIM to Nohabla Send a message via MSN to Nohabla Send a message via Yahoo to Nohabla
Yes they are matched, or at least supposed to be, but perhaps i have managed to mix them up. I will take them out and do a rematching.
Does the BOM look right to you, for a A5?

Last edited by Nohabla; 30th October 2018 at 09:44 PM.
  Reply With Quote
Old 8th November 2018, 10:05 PM   #7
Nohabla is offline Nohabla  Norway
diyAudio Member
 
Join Date: Feb 2007
Location: Norway
Send a message via AIM to Nohabla Send a message via MSN to Nohabla Send a message via Yahoo to Nohabla
The input 9610's (Q1-3) and even the ztx450 (Q4-5) are matched. Both cards shows the same values under test. I have populated the cards as per the BOM posted.
If there is an error i must have made it on both cards.
I have checked the cards and it looks like the parts are installed in the right places

Any sugestions to what to look for?
  Reply With Quote
Old 8th November 2018, 10:26 PM   #8
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Aleph 5 based on BrianGT boards
3 wires going to lower group of mosfets , but 4 wires going to upper group of mosfets ?

that additional is sense for Aleph CCS
__________________
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
Old 8th November 2018, 10:41 PM   #9
Bfpca is offline Bfpca  Canada
diyAudio Member
 
Join Date: Feb 2007
Location: Nova Scotia
Aleph 5 based on BrianGT boards
I just looked up the Vgs for a batch of 9610s I matched for a Group buy. 3.8volts would be pretty typical for. Looks like 23.5ma total current but only 8.4m across r18. 3.8volts is not enough to turn on the output fet. I see a lot of resistors are TBD. Do you have the recommended values in place? If you can’t find any problems you could try a 1k pot in place of R18. Start with it at 0 ohms and adjust it for the correct bias current.
  Reply With Quote
Old 8th November 2018, 10:45 PM   #10
Nohabla is offline Nohabla  Norway
diyAudio Member
 
Join Date: Feb 2007
Location: Norway
Send a message via AIM to Nohabla Send a message via MSN to Nohabla Send a message via Yahoo to Nohabla
4 wirres goes to each side, the black was probably hard to see in the first pic's.

1541716889959.jpeg1541716910976.jpeg1541716964400.jpeg

Last edited by Nohabla; 8th November 2018 at 11:04 PM.
  Reply With Quote

Reply


Aleph 5 based on BrianGT boardsHide 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
Gainclone building thread based on BrianGT's boards meat Chip Amps 752 8th August 2004 07:25 AM


New To Site? Need Help?

All times are GMT. The time now is 03:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki