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

Solid State Talk all about solid state amplification.

diyAB Amp - The "Honey Badger"
diyAB Amp - The "Honey Badger"
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 15th September 2013, 01:14 PM   #1021
Krisfr is offline Krisfr  United States
diyAudio Member
 
Krisfr's Avatar
 
Join Date: Nov 2007
Location: near the House of the Mouse
Quote:
Originally Posted by cod3gen View Post
Sounds great OS.

Take a look at my attachment, does it look somewhat correct? What value would you recommend for R19 at 80v?

I used this amp almost for a month earlier, and is now waiting for me to complete the cabinet for it. Ive fitted the honey badger with 4 pairs of outputs instead of 3. It seems to work pretty good, except i get some banging in my speaker when i reach high sound levels with much peaks of bass, and after i saw the posts these latest days, i though maybe that could be the cause for the bangs. Other than this, honey badger rocks with 4 outputs.
Are you running with Plus/Minus 80 rails? WOW
__________________
Thanks
Never give a Systems Analyst a screwdriver or hammer
  Reply With Quote
Old 15th September 2013, 07:37 PM   #1022
ostripper is offline ostripper  United States
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Quote:
Originally Posted by keantoken View Post
Here's the basic thing. Values aren't shown because it's not one-size-fits-all. I suggest using low-capacitance schottkeys. Some diodes actually have too low voltage drop and leakage is too large in this position, I think the 1N5817 is an example (but I think that has too much capacitance anyways).
Tried it , your right ... not any diode - you must use a VERY low reverse leakage
device or distortion increases a hundred-fold (NO 1N4148/914).

Cod3gen's model , my MUR models, or my NPX diode model show almost no increase in distortion.

When you overdrive ,it is not asymmetrical , and it will clip before saturation.
It could be useful for "throttling" a sub amp (as dan says). Wherever you put
a diode in this amp's signal path , it better be a good (exceptional) one.

OS
Attached Images
File Type: jpg clipper1.jpg (106.9 KB, 786 views)
__________________
Wanderer - my travels.... Facebook - davyjones lockre -
  Reply With Quote
Old 15th September 2013, 07:49 PM   #1023
ostripper is offline ostripper  United States
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Quote:
Originally Posted by keantoken View Post
Here's the basic thing. Values aren't shown because it's not one-size-fits-all. I suggest using low-capacitance schottkeys. Some diodes actually have too low voltage drop and leakage is too large in this position, I think the 1N5817 is an example (but I think that has too much capacitance anyways).
Tried it , your right ... not any diode - you must use a VERY low reverse leakage
device or distortion increases a hundred-fold (NO 1N4148/914).

Codegen's model , my MUR models, or my NPX diode model show almost no increase in distortion.

When you overdrive ,it is not asymmetrical , and it will clip before saturation.
It could be useful for "throttling" a sub amp (as dan says). Wherever you put
a diode in this amp's signal path , it better be a good (exceptional) one.

OS
__________________
Wanderer - my travels.... Facebook - davyjones lockre -
  Reply With Quote
Old 18th September 2013, 08:47 PM   #1024
danielwritesbac is offline danielwritesbac  United States
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Ah, well, the clippers should be quite delightful for a bass amp. Can you check a Series pair of bat86 set antiparallel with series pair bat86? That should be fairly quiet until about 0.587v or so, whereupon it will sound like a bright texture upon the bass or some fuzz, but this is a bit quieter than regular clipping, and a lot quieter than x-max.

P.S.
For full bandwidth amp, a jfet is probably more desirable than diode switching noises.
__________________
DIY Models & AppsClipNipperLM1875TDA7293Powerful Parallel TDA7293 kit ♦ My post has opinion.
  Reply With Quote
Old 18th September 2013, 11:59 PM   #1025
ostripper is offline ostripper  United States
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Quote:
and a lot quieter than x-max
I've never seen that expression

Nothing like slammin' a voice coil .... My Badger pushed one of my mission woofers right out of the frame (it even stayed out ) before I replaced it.

I was trying to burn them out, BTW !!!

OS
__________________
Wanderer - my travels.... Facebook - davyjones lockre -
  Reply With Quote
Old 30th September 2013, 09:36 PM   #1026
ostripper is offline ostripper  United States
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Default DIYA store is out of Badgers , time for the V2.4 !

They are all gone! ... Variac has messaged me for the updated boards.

I explained I wanted to run the output (the final V2.4) - through the forum to look for mistakes and to verify the addition of the baker clamp diode.

Below is the Sprint output as it is. I have added the clamp diode , it is designated as "D-BC-option" (circled in yellow).

Q10's output trace only crosses low impedance traces , the emitter resistor of Q10 (R23) and the TMC feedback trace (where C7-8 and R24 meet) ... also low impedance - as it is the main output > R24.

The Diode (D-BC-option) jumps the regulated V+ rail to the base of Q9. So , we have the V+ separating low and high imp. .... UNLESS Q10 saturates.

With the best diode (very low reverse leakage) one should not realize the diode's effect during normal use.
An SMD device could be used on the topside of the board with a little skill at soldering wires on the device.
I decided to not use SMD pads to keep the base trace of Q9 "clean" and separated from the VAS by the V+ trace.


Any comments and suggestions are HIGHLY welcome - this amp is for the community.

OS
Attached Images
File Type: jpg V2.4 final.JPG (150.0 KB, 626 views)
__________________
Wanderer - my travels.... Facebook - davyjones lockre -
  Reply With Quote
Old 5th October 2013, 02:37 AM   #1027
danielwritesbac is offline danielwritesbac  United States
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Default Great amplifier design spoilt by disasterous Twist-A-Plot documentation & board print

Nobody commented? Unbelievably, it is up to me, so here goes with that. . .

Yes sir. I had some ideas in Feburary, but they were not my own ideas, rather a collection of build tweaks that were popular or helped. They're at post#908 on this same thread.
That information needs inspected.
I tried my best but was confused.
There some different options and there is also an attempt to constrain the dials to block the optional explode settings, but I do not know if the schema shown does it well enough. I also tried to make sense of the luxeman zener confusions area of the schema, but could not make any sense of that.
That post may have a mix of bad and good ideas. I hope you can extract the good ideas from it. There are a few better parts, and also there's a more appropriate nfb-shunt-cap value suited for indoor use.

Ultimately, and because of the documentation, I decided that it would be unsafe for me to purchase a Honey Badger. My troubleshooting skills are not strong enough to resolve all of the questions raised by the documentation that doesn't do much else.

Unfortunately, the documentation Prevents making a (1) optimized amplifier.

As evidenced on the threads, the main cause(s) of Honey Badger failure is unsafe Twist-A-Plot assembly manual that goes in many directions instead of one. . . and there's the misleading screen print on the board that could build more than one amplifier but not all simultaneously as it is printed, which is a misdirection.
Options are nice, but please spare a totally separate document for those.

We need a goal for the assembly manual to make one (1) amplifier start up and run on the first try. That might be an appropriate assembly manual. Please choose whichever (1) design is mostly likely to play on first go. And, then don't pollute the assembly manual with confusing mishmash options. Also, the board screen print needs focused/directed towards a goal of start up and work on the first try.

Although exploration of different options may be nice, that sort needs documented separately and at a safe distance.
The amplifier design is great. I look forward to the documentation catching up to it. I'm still waiting on an assembly manual that has a goal of working.

P.S.
Sorry if that was brutal. However, you didn't get any other input. Maybe this will do it.
I do like your design. However, I would also like to use it (but I'm frustrated by the unclear assembly documentation). See the difference?
__________________
DIY Models & AppsClipNipperLM1875TDA7293Powerful Parallel TDA7293 kit ♦ My post has opinion.

Last edited by danielwritesbac; 5th October 2013 at 02:39 AM.
  Reply With Quote
Old 5th October 2013, 02:53 AM   #1028
JojoD818 is offline JojoD818  Philippines
diyAudio Moderator
 
JojoD818's Avatar
 
Join Date: Mar 2003
Location: searching...
diyAB Amp - The "Honey Badger"
I wonder if you've already seen the official build guide for the Honey Badger.

The documentation does not prevent anyone from building an optimized amplifier, it gives you options, and more options. I think what you are looking for is somebody else coming up with the optimized values and post it here.
  Reply With Quote
Old 5th October 2013, 02:54 AM   #1029
danielwritesbac is offline danielwritesbac  United States
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
As for the diode thing to prevent an output from sticking: There's no need to install an extra fuzzbox when the real problem is that documentation failed to enforce the notion of valid transformer voltages, 35+35vac~45+45vac range. If someone uses a lot smaller transformer than required and causes errors, that is really not a electronic design fault, but rather it is an inaccurate build. It doesn't need a design change. However, it does reiterate the need for functional documentation. There was that difference, we do need clear notes and we don't need fuzz.
Does that help sort it?
__________________
DIY Models & AppsClipNipperLM1875TDA7293Powerful Parallel TDA7293 kit ♦ My post has opinion.
  Reply With Quote
Old 5th October 2013, 02:54 AM   #1030
danielwritesbac is offline danielwritesbac  United States
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally Posted by JojoD818 View Post
I wonder if you've already seen the official build guide for the Honey Badger.

The documentation does not prevent anyone from building an optimized amplifier, it gives you options, and more options. I think what you are looking for is somebody else coming up with the optimized values and post it here.
Yes sir, optimized values are expected of anything that isn't prototype/experimental status.


P.S.
I don't mean to be rude, but OStripper did ask a question and my answer was to boost the documentation quality instead of presenting a mixed slew of options. Straightforward documentation is only one answer of many possible. Consider it a wish list.
__________________
DIY Models & AppsClipNipperLM1875TDA7293Powerful Parallel TDA7293 kit ♦ My post has opinion.

Last edited by danielwritesbac; 5th October 2013 at 03:02 AM.
  Reply With Quote

Reply


diyAB Amp - The "Honey Badger"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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
diyAB Amp The "Honey Badger" build thread Variac Solid State 3058 14th June 2018 05:34 PM
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 01:03 PM.


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