ThermalTrak+TMC amp - Page 8 - 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 29th March 2012, 12:16 PM   #71
Bonsai is offline Bonsai  Taiwan
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Taipei, Taiwan
Looks good! Congratulations!
__________________
bonsai
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
  Reply With Quote
Old 30th March 2012, 12:44 AM   #72
diyAudio Member
 
Join Date: Nov 2011
Location: Maryland
Default TT-triple

I've been building the amp in parallel with Dadod, on my side of the Atlantic. He has been very helpful answering my questions and guiding me through my first fully discrete DIY amp. He was kind enough to send me the amplifier PCBs and heatsinks (not available in the USA).

Many thanks, Dadod!

So far I've constructed the power supply, DC regualtor/speaker protection, and almost have one channel complete. After I have the first channel operational, I will begin the second.

I made a parts list, which I've shared on Google Docs.

A few more steps I should be ready for the light bulb test.

Here are a few photos:
Attached Images
File Type: jpg power_supply_pcb.JPG (148.4 KB, 514 views)
File Type: jpg PSU_Regulator_PCB.JPG (148.9 KB, 488 views)
File Type: jpg reg_pcb_backlight.JPG (205.4 KB, 481 views)
File Type: jpg psu.JPG (206.7 KB, 476 views)
File Type: jpg reg_bjt_3.JPG (235.5 KB, 471 views)
File Type: jpg tt_triple_4.jpg (177.2 KB, 219 views)
File Type: jpg chassis.jpg (252.9 KB, 181 views)
File Type: jpg chassis_2.jpg (608.4 KB, 165 views)
File Type: jpg reg_bjt_test_4.jpg (362.8 KB, 172 views)

Last edited by greenm01; 30th March 2012 at 12:46 AM. Reason: grammer
  Reply With Quote
Old 2nd April 2012, 11:43 PM   #73
diyAudio Member
 
Join Date: Nov 2011
Location: Maryland
Default Single channel, alive!

youtube A single channel comes to life, and it sounds wonderful!

/Mason

Last edited by wintermute; 3rd April 2012 at 10:31 AM. Reason: add youtube tag
  Reply With Quote
Old 3rd April 2012, 10:33 AM   #74
just another
diyAudio Moderator
 
wintermute's Avatar
 
Join Date: Aug 2003
Location: Sydney
Blog Entries: 22
Hi greenm01 I added a tag that your link was youtube as there are some members on limited bandwidth or who get logged at work if they go to youtube. No biggy but probably a good idea to tag when you post

Tony.
__________________
Any intelligence I may appear to have is purely artificial!
Some of my photos
  Reply With Quote
Old 3rd April 2012, 11:55 AM   #75
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Some measuremts here. Sinus 1kHz and 20kHz at a level just below the clipping.
Next are square waves 10kHz and 20kHz on the 8 ohm load.
dado
Attached Images
File Type: jpg sin-1kHz.JPG (455.8 KB, 132 views)
File Type: jpg sin-20kHz.JPG (463.9 KB, 80 views)
File Type: jpg square-10kHz.JPG (949.6 KB, 89 views)
File Type: jpg square-20kHz.JPG (918.0 KB, 104 views)
  Reply With Quote
Old 3rd April 2012, 11:59 AM   #76
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Here I put 0.1uF capacitor parallel to the 8 ohm load. First 1kHz and second 20kHz.
dado
Attached Images
File Type: jpg square-1kHz_0.1u.JPG (876.6 KB, 111 views)
File Type: jpg square-20kHz_0.1u.JPG (489.1 KB, 119 views)
  Reply With Quote
Old 3rd April 2012, 12:10 PM   #77
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Next is 1uF parallel to the 8 ohm load at 20kHz. Durin the test I overloaded the amp and the power supply protection switched off the power. Reset was done by switch off and after some seconds switch on again, and all worked.
dado
Attached Images
File Type: jpg square-20kHz_1u.JPG (880.6 KB, 121 views)
File Type: jpg 8ohm_0.1uF.JPG (523.3 KB, 99 views)
File Type: jpg 8ohm_1uF.JPG (545.5 KB, 67 views)
File Type: jpg triagle-1kHz.JPG (956.6 KB, 73 views)
  Reply With Quote
Old 4th April 2012, 04:21 AM   #78
diyAudio Member
 
Join Date: Dec 2006
Location: Where the sky loves the sea
Well done!

I agree with your approach to thermal compensation, I did a lot of (theoretical) study of that approach a while back and it seemed ideal. Looks like it is working very well for you.
__________________
"We monitor many frequencies. We listen always. Came a voice, out of the babel of tongues, speaking to us. It played us a mighty dub… "
  Reply With Quote
Old 5th April 2012, 12:36 PM   #79
diyAudio Member
 
Join Date: Nov 2011
Location: Maryland
Default meaurements

Hi, Dado.

The amp is sounding worderful: punchy bass, smooth mids, and aggressive highs. I'm looking forward to completing the second channel.

A few questions in regard to the TT-Triple:
  1. Do you happen to know the input sensitivity?
  2. Have you been able to measure real-world THD?
Also, an unrelated observation/question not specific to this amplifier. On most of my amps, I can hear very low level Johnson Noise (white noise) with no input signal, and my ear pressed up to the speaker. I'm not sure if this is from the speakers themselves, noise from amplifier RC components, or a combination. It's definitely not a ground loop, but low volume white noise. My living space ambient noise is MUCH louder, but I'm just curious about the source of the white noise.....

With headphones I don't notice white noise with line level portable media players and computer audio output.

/Mason
  Reply With Quote
Old 5th April 2012, 01:27 PM   #80
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
With the Power Amplifier input shorted you should not be able to hear any noise from the connected speaker.
If you can then the amp has too high a noise level for that speaker.

If my amps measure <=0.1mVac, I generally cannot hear any noise from the speakers I use.
__________________
regards Andrew T.
  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
MEMDIST POWER AMP + JC + TMC - help to set up padamiecki Solid State 8 10th January 2014 09:38 AM
Compact Sized LME49810/11 +ThermalTrak Amp panson_hk Chip Amps 302 25th September 2013 10:23 AM
New 200 watt Kit amp features ultra low distortion and Thermaltrak devices snoopy Solid State 56 3rd May 2010 08:42 AM
Mini-Sized 49811 ThermalTrak Amp panson_hk Chip Amps 3 1st April 2010 08:06 AM
What to do with TMC tube radio gear? diamondsouled Tubes / Valves 4 31st March 2009 01:30 PM


New To Site? Need Help?

All times are GMT. The time now is 06:46 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