diyAB Amp The "Honey Badger" build thread - Page 48 - 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 17th August 2013, 03:58 AM   #471
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Default Reviewed version of the Honey Badger amp.

I have had a PM asking me to tell what transistors and settings I used for the Honeybadger amp used in the stereonet review so thought I would post here so others can see as well. I will copy and paste from the original options.txt file ostripper produced.

The cascode (Q3-4) can be setup in 2 (or more) ways.

- The first is a zener referenced design - omit R18 , replace
with a 1/2w- 1w 12-15V zener diode and set jumper pad "C" to "Z" with thin wire. The "CRZ" jumper pads
are located above D1-2 near "OFFSET". You will have a cascode reference of either 12 or 15V , depending
on Zener diode choice.



The VAS , (Voltage Amplification stage) is what takes the small signal from the cascode/current mirrors and creates a
wide, rail to rail "swing" . With 60V supplies ,this can be a large as 110V peak to peak. This signal is also what you "hear"...
after the big devices of the output stage increase the current a 1000 times or more.

The "OPTIONS" here are numerous. The small CCS just has a 20 turn 200R trimmer(R7) , this CCS controls the LTP current , it can
be adjusted between 1.8ma to almost 6ma , optimum is 70-100R-R7 giving 3.5ma at the "tail" of the LTP.
The "BIG CCS" is a part of the VAS .... with R27=68R ,the VAS will have a current of about 9 mA. Other values-R27 are 100R=6ma(I used R27=100r) or
56R=10.5ma. These changes will affect the Bias of the amplifier , MAKE SURE "bias"-R30 is set at maximum 500R if you change R27!



The VAS itself has 2 compensation modes:
1. Conventional miller compensation (CMC)- Omit R24 - (the feedback 820R 1/4w resistor) , omit EITHER C7 or C8 replace one witha wire jumper and the remaining one with a 68pF 300-500v silver mica capacitor . So ... C8= jumper R24=nothing C7=68pF(as an example).




Don't install an LC capacitor(this made it sound worse).



Q13 was 2SC3953
Q14/15 are MJE15032/MJE15033
Transformer is 600w 40-0-40V
I used a single transformer supplying 2 separate power supplys, one for each channel. Each supply had 4 x 12000uf 63v Elna for audio caps and some 100nf bypass caps.


Most important for the great sonic character of this amp was to change the imput capacitor "C1". I used in mine a Clarity Cap SA 4.7uf.



Regards

Simon
  Reply With Quote
Old 18th August 2013, 01:47 AM   #472
naf is offline naf  Indonesia
diyAudio Member
 
Join Date: Aug 2011
thank you very much Simon for sharing your Honeyabadger setup
  Reply With Quote
Old 18th August 2013, 02:46 AM   #473
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Quote:
Originally Posted by naf View Post
thank you very much Simon for sharing your Honeyabadger setup
No problem naf.
  Reply With Quote
Old 18th August 2013, 04:13 AM   #474
repeet is offline repeet  Australia
diyAudio Member
 
Join Date: Oct 2009
Location: Brisbane
Quote:
Originally Posted by niss_man View Post


Most important for the great sonic character of this amp was to change the imput capacitor "C1". I used in mine a Clarity Cap SA 4.7uf.



Regards

Simon
Have you tried no cap at all? The DC offset can be completely zerod, so if your input has no DC then do you even need this cap?
  Reply With Quote
Old 18th August 2013, 05:37 AM   #475
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Quote:
Originally Posted by repeet View Post
Have you tried no cap at all? The DC offset can be completely zerod, so if your input has no DC then do you even need this cap?
Have not done this. I wouldn't really do that unless there was extra circuitry (dc servo) there anyway.

This thing has had enough experimenting by me since building it. Am happy with the results.

Simon
  Reply With Quote
Old 18th August 2013, 05:40 AM   #476
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Thanks for providing me with those parts at the early build stage by the way Repeet.

Simon
  Reply With Quote
Old 18th August 2013, 11:23 AM   #477
loek is offline loek  Netherlands
diyAudio Member
 
Join Date: Feb 2005
Location: The Hague
Thanks for posting your settings Simon. Last question: which output devices did you use?
  Reply With Quote
Old 20th August 2013, 10:06 AM   #478
diyAudio Member
 
Join Date: Sep 2008
Location: Brisbane
Quote:
Originally Posted by loek View Post
Thanks for posting your settings Simon. Last question: which output devices did you use?
NJW0281 / NJW0302
  Reply With Quote
Old 20th August 2013, 04:58 PM   #479
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Albany , NY (smallbany)
Quote:
Originally Posted by niss_man View Post
NJW0281 / NJW0302
__________________
Mongrel website , always current and updated :
http://www.fidelityforce.com/ostripper
  Reply With Quote
Old 21st August 2013, 02:35 AM   #480
pthep is offline pthep  Canada
diyAudio Member
 
Join Date: Jun 2013
If someone wouldn't mind explaining to a layman the principles behind a star ground, or if indeed that is what is supposed to happen in this context. The major ground contact is intended to be attached to the case floor. Are all the the other various contacts supposed to be routed to the same point, or can a floor attachment be made at any convenient fllor point?
Attached Images
File Type: jpg layout1.jpg (327.0 KB, 286 views)
  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" Variac Solid State 1276 3rd July 2014 11:14 AM
My LM3886 build thread CanAm Man Chip Amps 22 13th July 2012 07:48 AM
Ricci's dual B&C 21SW152 build thread. Josh Ricci Subwoofers 22 12th April 2010 09:39 PM
New Project Build Thread ryoung Multi-Way 5 19th April 2008 01:15 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 12:53 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