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" build thread
diyAB Amp  The "Honey Badger" build thread
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 11th March 2019, 03:33 AM   #3421
stuartmp is offline stuartmp  Australia
diyAudio Member
 
Join Date: May 2016
Location: Gold Coast
Finally getting somewhere with this build. Its only taken me 3 years. Lol.

20190309_101558.jpeg20190309_101604.jpeg20190311_111108.jpeg20190311_111100.jpeg20190311_111014.jpeg20190311_111020.jpeg20190217_140732.jpeg
Attached Images
File Type: png 11-03-19 1-35-01 PM.png (35.7 KB, 292 views)
File Type: png 11-03-19 1-35-11 PM.png (81.0 KB, 285 views)
File Type: png 11-03-19 1-35-23 PM.png (413.9 KB, 259 views)

Last edited by stuartmp; 11th March 2019 at 03:37 AM.
  Reply With Quote
Old 11th March 2019, 09:47 AM   #3422
rock12 is offline rock12  United States
diyAudio Member
 
Join Date: Nov 2010
Location: midland mi
Nanchangebob I myself have this same problem in only one channel I rebuilt the board and had the same raising bias I was told it could be high frequency oscillation I have switched some transistors and resistors and got better readings but it still takes off. Do not know my post numbers but will scan for them later and let you know. I have been playing the amp on my workbench for months set at a low bias (12mv) and it sound great
  Reply With Quote
Old 11th March 2019, 10:26 AM   #3423
rock12 is offline rock12  United States
diyAudio Member
 
Join Date: Nov 2010
Location: midland mi
Nanchangebob. Jan 4 thru jan17 pp 327 thru 333. Or post 3263 thru 3343
  Reply With Quote
Old 12th March 2019, 08:18 PM   #3424
nanchangbob is offline nanchangbob  United States
diyAudio Member
 
nanchangbob's Avatar
 
Join Date: May 2009
Location: Ohio
Thanks for your replies guys but I think I have the problem figured out.

I received the DCA75 and I really like this neat little test gear, it makes quick work of matching and testing components and it doesn't matter how you connect the leads as it figures it out for you. I found that I had a couple of transistors that were bad and the others measured low hfe. I tested the other 6 outputs I received from mouser and they all measured within 5 percent and did not believe that Digikey sent dead components so I went and did a test with a 317 regulator using the normal pads first and the temperature rose from about 69 degrees F to around 90 degrees F within 10 or 15 minutes. I tried the 3m pads and the temperature of the heat sink stayed at about 70 degrees for the entire 10 to 15 minutes. I don't think the pads are defective only my application of the pads, one side has a thick film that is easily removed and the other side has a thin film which I'm not sure how to remove it without destroying the pad. On the datasheet, it states the thermal conductivity as 3.5 W/m-K with film and 5 W/m-K without. It states in the product description, 3M TCSIP 5549S has permanent PEN film 6 micrometer thick on one side to provide for a non-tacky surface, increased puncture resistance, ease of handling and rework. I'm not sure how to properly use this product and did call 3m for clarification, unfortunately, the woman responsible for it doesn't answer the phone or return calls. For now, I will put it on a shelf and use the old cheap pads.

I have new outputs coming tomorrow after I match them I will install them and I have a good feeling everything will work as it should.

I hope in my tone I didn't imply the design was defective only that I must be making a catastrophic mistake and I was wondering if someone might know what I did wrong. I did suspect it was thermal related and I included the 3m datasheet in my first post as I never used this product before and was wondering if I might have done something wrong.
__________________
A great day to listen to music.
  Reply With Quote
Old 12th March 2019, 09:41 PM   #3425
nanchangbob is offline nanchangbob  United States
diyAudio Member
 
nanchangbob's Avatar
 
Join Date: May 2009
Location: Ohio
I just received a call back from the rep at 3M and explained to her how I was using the product and she said that I was doing everything right and it should not respond in the way that it did and that somehow I may have received the wrong material?

They are sending me a new sheet but I will make sure to try it on the LM317 supply before attempting to use it on my amp outputs.

I must be the luckiest guy in the world!
__________________
A great day to listen to music.
  Reply With Quote
Old 13th March 2019, 04:40 AM   #3426
janusz is offline janusz  Australia
diyAudio Member
 
Join Date: Oct 2004
So you had bad transistors. Now with DCA75 you will be able to test all semis before using them. Looks that replacing these bad ones with good ones should solve the problem. Let us know how your HB performs once you have replaced all the bad components.

cheers,
  Reply With Quote
Old 13th March 2019, 02:37 PM   #3427
easyrider75 is offline easyrider75  Italy
diyAudio Member
 
Join Date: Dec 2016
Location: Peschiera del Garda
Hi, why in a R36 channel measure 5R on board and 150R out and burn fuses?
The other card reads 150R on board and works properly
  Reply With Quote
Old 15th March 2019, 04:36 AM   #3428
stocktrader200 is offline stocktrader200  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Calgary
Hi Stuartmp, I know what you mean about time. I started my SX-780 rebuild project over a year ago and I am just close to finished now.
Replace old amp with Lichtstark balanced mosfet amplifier ( Had a Badger that was great, but this thing is outstanding )
rebuild power for all tuner chips and upgrade FM output.
Upgrade all Voltage regulators
Rebuild and tune RIAA preamp for MM cartridge.
Add Iphone smoothing amplifier / conditioner.
Add 6922 tube preamp and low noise power supply.
Completely rebuild crossover in Nuance 3CLS tower speakers.
Fix AM chip and busted Balance control.
Now I just have to install it all

Last edited by stocktrader200; 15th March 2019 at 04:45 AM.
  Reply With Quote
Old 15th March 2019, 10:57 AM   #3429
stuartmp is offline stuartmp  Australia
diyAudio Member
 
Join Date: May 2016
Location: Gold Coast
Nice Work. Good luck with your project.
  Reply With Quote
Old 17th March 2019, 01:58 AM   #3430
Grendel321 is offline Grendel321  Congo-Brazzaville
diyAudio Member
 
Join Date: Jan 2019
Location: DRC
Quote:
Originally Posted by ostripper View Post
MOSFET = super low Rdson ,less than some wire. https://www.onsemi.com/pub/Collateral/NDPL180N10B-D.PDF

Two of them form a solid state relay that can disconnect a speaker at the speed of the protection circuitry.

OS
A great mosfet but as the HB has voltage rails of 60, would that mosfet with a vdss of 100V be sufficient? Wouldnt the mosfets vdss have to be 150V for the HB with 60 volt rails?
  Reply With Quote

Reply


diyAB Amp  The "Honey Badger" build threadHide 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" Variac Solid State 2035 19th March 2019 01:47 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 01:43 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki