diyAB Amp The "Honey Badger" build thread - Page 34 - 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 28th June 2013, 09:08 AM   #331
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
the boards were sent to me by an OFW from the middle east....i have no idea how he acquired them...
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 28th June 2013, 10:35 AM   #332
just another
diyAudio Moderator
 
wintermute's Avatar
 
Join Date: Aug 2003
Location: Sydney
Blog Entries: 22
Quote:
Originally Posted by donnyab View Post
Tony,
Are these boards available for sale from this website somewhere
Yes they are

The diyAB "Honey Badger" Class AB Power Amp - 150W/Channel (2 Channels) - Power Amplifiers - Circuit Boards

Another Tony
__________________
Any intelligence I may appear to have is purely artificial!
Some of my photos
  Reply With Quote
Old 28th June 2013, 10:41 AM   #333
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
thanks another Tony, i edited the first page to link the correct one...
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 1st July 2013, 06:21 AM   #334
Wembley is offline Wembley  Australia
diyAudio Member
 
Join Date: Mar 2010
Quote:
Originally Posted by ByronInLawrence View Post
To answer your other questions:
I didn't understand what is gained by the "zener reference design" over the "Luxman" way either. But the Luxman design was described as "crude" in the build guide, so I guessed it must be somehow inferior.
You can follow the trace from the ground-end of D1, D2 and R4 (G2) all the way to the star ground (G1) so they're not at different potentials. I really can't guess why they are written at G1 and G2 on the schematic.
I guess that depends on your definition of 'inferior'. A zener reference will maintain a constant voltage reference which is the same regardless of the voltage on the input voltage rails (within certain limits) while the Luxman simple resistor design will give a constant voltage that is proportional to the rail voltage and so may require a little calculation based on the planned voltage rails. Additionally, if there is variation on the voltage rail for any reason (such as voltage sag at high current draw) then the reference voltage will vary proportionally. How much of an issue those drawbacks represent is a matter of personal judgement, and for most users in most circumstances the simple Luxman style voltage divider will be adequate. However, for the tiny price difference I went for the zener reference.

As noted by others, some devices had _very_ tight lead clearances, and the zener was one of these for me, if I recall correctly. I didn't have to drill out any holes, but I did have to force a few leads through with more force than I would have liked.

My understanding of the differing grounds is that they are effectively 'local' grounds, all interconnected via a star system. It is used both to restrict tiny variations in potential and to allow 'noise' a direct path to earth rather than flowing past multiple devices. This is the basic principle behind star grounding. Although in theory an earth is always 0.00V and is uniform, the reality is that this is not always the case and star grounding helps limit adverse effects and current flows. The short story is that Ostripper has done all the hard design work and we get to use the fruits of his labour.
  Reply With Quote
Old 1st July 2013, 07:50 AM   #335
Wembley is offline Wembley  Australia
diyAudio Member
 
Join Date: Mar 2010
I have attached my BoM for the Honey Badger, as a Mouser shared cart available at the URL below. Note that for me at least this is based on Australian pricing.

http://www.mouser.com/ProjectManager...sID=8080aaf520

Device selection was based on recommendations from Ostripper, component availability and price. Some items drift in and out of stock and so this will no doubt need some modification. Mouser stock a range of metal film resistors from TE Connectivity which I chose preferentially when possible as they are 600mW and a small form factor, but they didn't have stock in all values.

My selection preferences for electrolytic caps was long life and relatively low ESR, along with high voltage rating. This has resulted in a pair of relatively tall capacitors. I tried to use polypropylene rather than polyester caps for the audio signal path.

Note there there is no enameled wire, no heat sink compound and no Red LED.

I sourced the 0.22 ohm resistors from AnalogMetric. Lead spacing isn't exact but is easily widened.

Cement 0.2 Ohm 5W Non-inductance Resistor_Cement_Resistor_Analog Metric - DIY Audio Kit

I can attach a spreadhseet with my component selections if that's easier, otherwise I'll leave the Mouser BoM.
  Reply With Quote
Old 3rd July 2013, 07:19 PM   #336
diyAudio Member
 
ByronInPortland's Avatar
 
Join Date: Nov 2010
Location: Portland, Oregon
Question What is the purpose of R7?

R7 is a variable resistor. The build guide says to set it to between 70R and 100R, then does not say anything about adjusting it. So what is the purpose of it being adjustable? Why not just replace it with a 70R to 100R resistor? Does anyone know?
  Reply With Quote
Old 4th July 2013, 03:08 AM   #337
chunek is offline chunek  Singapore
diyAudio Member
 
Join Date: Sep 2010
Location: Singapore
Follow the build guide pg 28,

2.The small CCS just has a 20 turn 200R trimmer (R7). This CCS controls the LTP current. The small CSS can be adjusted between 1.8ma to almost 6ma, and this is achieved by adjusting R7 to between 70 and 100 ohms, which will result the desired output of 3.5ma at the "tail" of the LTP. 3.75mA gives roughly 8.25V across R14. Before powering on the amp, set R7 to 85ohms

James
  Reply With Quote
Old 4th July 2013, 03:55 AM   #338
diyAudio Member
 
HoneyBadger's Avatar
 
Join Date: Sep 2011
A few questions about the build...

If you are only seeking a single mono configuration would this transformer
http://www.antekinc.com/pdf/AN-5445.pdf
be an acceptable alternative to the recommended
http://www.antekinc.com/pdf/AN-8445.pdf

What is the maximum current required from the transformer for the Honey Badger?

Are there other models with lower ratings that could fully utilize this amp in mono?

What is the orientation of the Zener diode? - This was not clear on the PCB

-Phil
  Reply With Quote
Old 4th July 2013, 06:03 AM   #339
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally Posted by HoneyBadger View Post
Are there other models with lower ratings that could fully utilize this amp in mono?
Monobloc (or dualmono)? Probably the 400va will do fine. Antek - AS-4445 EDIT: This also looks good: Antek - AS-4440 for longevity/durability
__________________
Tools, Models & Software for DIYClipNipper boostLM1875 TurboPowerful TDA7293 kitTDA7294 pt2pt ♦ My post has opinion.

Last edited by danielwritesbac; 4th July 2013 at 06:09 AM.
  Reply With Quote
Old 4th July 2013, 10:06 AM   #340
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
i was given 2 antek an3232 .....
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  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 02:51 PM.


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