GB for DC coupled B1 buffer with shunt PSUs - Page 155 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 17th November 2009, 01:15 PM   #1541
billyk is offline billyk  United States
diyAudio Member
 
billyk's Avatar
 
Join Date: Oct 2005
Location: North Central Mass, USA
Quote:
Originally Posted by gabanyayaya View Post
Is this what you mean...? Which is the wrong one?

Click the image to open in full size.
There is NO "PCB error" as can be seen by looking at the photos of the prototypes. The screens are correct as are the orientations of the transistors.

I may be reading incorrectly but I believe that AndrewT is pointing out something he thinks is incorrect as he stated in Post 148. Please read the reply to this by Salas. The prototypes work well and sound great.
  Reply With Quote
Old 18th November 2009, 05:42 AM   #1542
kp93300 is offline kp93300  Malaysia
diyAudio Member
 
Join Date: Mar 2007
Default Thank you and board received

Hi
I received the 2 boards today . There are in good condition.
Thanks

kp93300
malaysia.
  Reply With Quote
Old 18th November 2009, 08:13 AM   #1543
massimo is offline massimo  Italy
diyAudio Member
 
Join Date: Dec 2002
Location: Milan, Italy
Nice surprise coming back home yesterday: a nice white envelope from Maine
9 boards received for our mini GB!
Thank you Tea Bags, Salas, Crt and all!
  Reply With Quote
Old 18th November 2009, 09:35 AM   #1544
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Default jFET error

Quote:
Originally Posted by billyk View Post
There is NO "PCB error" as can be seen by looking at the photos of the prototypes. The screens are correct as are the orientations of the transistors.

I may be reading incorrectly but I believe that AndrewT is pointing out something he thinks is incorrect as he stated in Post 148. Please read the reply to this by Salas. The prototypes work well and sound great.
Hi,
please ignore my post148 and my references to it for this PCB. It works as drawn.

Now let's look at the 4devices inside the red rectangle.
The top is negative.
The bottom is positive.

The upper jFET (-ve side) has the Drain connected via a 10r to ground.
The Gate and Source pins are on a common trace and connected to the LEDs.
This is correct.

The lower jFET (+ve side) has the Source connected via a 10r to ground.
The Gate and Drain pins are on a common trace and connected to the LEDs.
This is wrong.

My suggested solution is wrong.
Do not rotate the jFET.
The trace joining Drain to Gate must be cut.
The Gate and Source pins must be soldered together. A long Gate pin under the board can be bent over and soldered to the nearby Source pin.

I am glad you all argued the point.
It made me look again and again to see that the real solution is as stated above.
__________________
regards Andrew T.
  Reply With Quote
Old 18th November 2009, 12:24 PM   #1545
COX77 is offline COX77  France
diyAudio Member
 
Join Date: Oct 2009
j'am lookinf for B1 PCB
Philippe
Contact : philippe.gil-garcia@cstb.fr
  Reply With Quote
Old 18th November 2009, 12:30 PM   #1546
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
Quote:
Originally Posted by kp93300 View Post
Hi
I received the 2 boards today . There are in good condition.
Thanks

kp93300
malaysia.
Quote:
Originally Posted by massimo View Post
Nice surprise coming back home yesterday: a nice white envelope from Maine
9 boards received for our mini GB!
Thank you Tea Bags, Salas, Crt and all!
Good to hear!
__________________
Salas Boards 2014 #2 SHIPPED |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
  Reply With Quote
Old 18th November 2009, 12:39 PM   #1547
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by AndrewT View Post
Hi,
please ignore my post148 and my references to it for this PCB. It works as drawn.

Now let's look at the 4devices inside the red rectangle.
The top is negative.
The bottom is positive.

The upper jFET (-ve side) has the Drain connected via a 10r to ground.
The Gate and Source pins are on a common trace and connected to the LEDs.
This is correct.

The lower jFET (+ve side) has the Source connected via a 10r to ground.
The Gate and Drain pins are on a common trace and connected to the LEDs.
This is wrong.

My suggested solution is wrong.
Do not rotate the jFET.
The trace joining Drain to Gate must be cut.
The Gate and Source pins must be soldered together. A long Gate pin under the board can be bent over and soldered to the nearby Source pin.

I am glad you all argued the point.
It made me look again and again to see that the real solution is as stated above.
Its as such on the board on purpose. Look here for more and why.
  Reply With Quote
Old 18th November 2009, 12:50 PM   #1548
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
Quote:
Originally Posted by COX77 View Post
j'am lookinf for B1 PCB
Philippe
Contact : philippe.gil-garcia@cstb.fr
COX77,
you can follow my link and sign up for next round of group buy, of course, someone may offer you an extra as well!

Next round of boards will be ordered after the new year.
__________________
Salas Boards 2014 #2 SHIPPED |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
  Reply With Quote
Old 18th November 2009, 02:17 PM   #1549
diyAudio Member
 
Tripmaster's Avatar
 
Join Date: Feb 2008
Location: UK
Quote:
Originally Posted by Tea-Bag View Post
COX77,
you can follow my link and sign up for next round of group buy, of course, someone may offer you an extra as well!

Next round of boards will be ordered after the new year.
Hi

I have added my name to the forthcoming group buy, but in the mean time I was wondering if anyone has a spare Mesmerize PCB for sale?

Thanks
__________________
Richard
My photostream: http://www.flickr.com/photos/59839778@N04/
  Reply With Quote
Old 18th November 2009, 05:04 PM   #1550
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by Salas View Post
Its as such on the board on purpose. Look here for more and why.
Quote:
THIS IS NOT APPLICABLE WHEN THE HYPNOTIZE IS FULLY STUFFED USED AS A BUFFER. THE JFET GOES IN NORMALLY THEN.
why is the modification the case for the universal version but not for the DCB1 version?
__________________
regards Andrew T.

Last edited by AndrewT; 18th November 2009 at 05:08 PM.
  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



New To Site? Need Help?

All times are GMT. The time now is 10:07 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