diyAB Amp - The "Honey Badger" - Page 44 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 November 2011, 02:25 AM   #431
diyAudio Moderator
 
JojoD818's Avatar
 
Join Date: Mar 2003
Location: searching...
Likewise Tony, it was nice meeting you at the 2011 HiFi Show!
  Reply With Quote
Old 20th November 2011, 05:22 AM   #432
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Quote:
Originally Posted by JojoD818 View Post
Read OS's recommendation on the VAS, different R27 gives different VAS current. Beware, changing R27 will have an effect on output bias so start all over again if you change R27.
Reading 0.544V across R27(68r) = 8mA.

Yeah my boards are flipped. I accidentally produced my boards as a mirror image so transistors to the heatsink are underneath. Components on top had to be installed as a mirror image.

Regards

Simon
  Reply With Quote
Old 20th November 2011, 01:28 PM   #433
diyAudio Moderator
 
JojoD818's Avatar
 
Join Date: Mar 2003
Location: searching...
Quote:
Originally Posted by niss_man View Post
Reading 0.544V across R27(68r) = 8mA.

Yeah my boards are flipped. I accidentally produced my boards as a mirror image so transistors to the heatsink are underneath. Components on top had to be installed as a mirror image.

Regards

Simon

Just about right on the VAS, I'm running our prototype at about ~10mA with 56R for R27. As you can see in the video, after 2 hours it still remains at no more than 47 degrees Centigrade.

I see, I thought my eyes were failing me when I saw the orientation of your pcb.

Cheers
  Reply With Quote
Old 21st November 2011, 09:54 AM   #434
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Am happy with VAS now. Changed R27 to 100r and reset the bias adjustment a little lower than before. Also doubled the size of the vas heatsink. Now it runs nice and cool as I like. I have access to one of those laser temperature probes as on your video at work so will use it when I get the oportunity. Thanks for your help.

Regards

Simon
Attached Images
File Type: jpg IMGP1209.JPG (195.9 KB, 981 views)
  Reply With Quote
Old 21st November 2011, 10:29 AM   #435
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Back to the same questions
Quote:
Originally Posted by AndrewT View Post
What voltage and current is the VAS set to?
__________________
regards Andrew T.
  Reply With Quote
Old 21st November 2011, 01:02 PM   #436
Jason is offline Jason  Australia
:)
diyAudio Administrator
 
Jason's Avatar
 
Join Date: Oct 2000
Location: Melbourne
Blog Entries: 1
Quote:
Originally Posted by Tony View Post
OT: jojo, nice meeting you and Jason finally at the audio show yesterday..... wished we could talk longer, please give my best to Jason....
Great to meet you too Tony It was a very cool show and awesome to meet you and all the locals
  Reply With Quote
Old 21st November 2011, 02:17 PM   #437
diyAudio Moderator
 
JojoD818's Avatar
 
Join Date: Mar 2003
Location: searching...
Quote:
Originally Posted by niss_man View Post
Am happy with VAS now. Changed R27 to 100r and reset the bias adjustment a little lower than before. Also doubled the size of the vas heatsink. Now it runs nice and cool as I like. I have access to one of those laser temperature probes as on your video at work so will use it when I get the oportunity. Thanks for your help.

Regards

Simon

Cool. The heat from the VAS is quite constant. The recommended heatsink was more than enough to maintain temps below 50*C even with higher ambient temps. I live in a tropical country so it gets kinda warm during the afternoon.
  Reply With Quote
Old 24th November 2011, 05:47 AM   #438
diyAudio Member
 
Join Date: Jan 2004
Location: Toronto, ON, Canada
I was checking through the thread and it didn't seem like there were any THD-20kHz, IMD, PIM, etc.

Anybody feel like running more sims?
  Reply With Quote
Old 24th November 2011, 08:30 AM   #439
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
If anyone has the equipment and know how (of which I have neither)to do this who lives near by to me I would gladly donate my time and amp to help find out. The simple answer I think is Bloody Low distortion and sounds Great....

Regards

Simon
Quote:
Originally Posted by 454Casull View Post
I was checking through the thread and it didn't seem like there were any THD-20kHz, IMD, PIM, etc.

Anybody feel like running more sims?
  Reply With Quote
Old 27th November 2011, 07:31 PM   #440
Krisfr is offline Krisfr  United States
diyAudio Member
 
Krisfr's Avatar
 
Join Date: Nov 2007
Location: near the House of the Mouse
As it relates to the board I am doing for this project, just how long does it take, for those that make their own boards, using the toner transfer method, most of you to "IRON" on the toner? Is there a set period of time to take that does not burn the board paper used in the transfer? Just curious. It seems to take me for ever. In excess of 30 minutes per side.
__________________
Thanks
Never give a Systems Analyst a screwdriver or hammer
  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
diyAB Amp The "Honey Badger" build thread Variac Solid State 1150 2nd July 2014 11:45 AM
Honey, I smoked the Weller 8200 jackinnj Equipment & Tools 5 25th April 2011 06:07 AM
Badger Badger Badger..... Mushroom !! 5th element Everything Else 15 20th September 2003 03:16 PM


New To Site? Need Help?

All times are GMT. The time now is 10:14 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