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ThermalTrak+TMC amp
ThermalTrak+TMC amp
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Old 29th March 2012, 12:16 PM   #71
Bonsai is offline Bonsai  Europe
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Looks good! Congratulations!
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Old 30th March 2012, 12:44 AM   #72
greenm01 is offline greenm01  United States
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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, 715 views)
File Type: jpg PSU_Regulator_PCB.JPG (148.9 KB, 685 views)
File Type: jpg reg_pcb_backlight.JPG (205.4 KB, 672 views)
File Type: jpg psu.JPG (206.7 KB, 663 views)
File Type: jpg reg_bjt_3.JPG (235.5 KB, 656 views)
File Type: jpg tt_triple_4.jpg (177.2 KB, 297 views)
File Type: jpg chassis.jpg (252.9 KB, 250 views)
File Type: jpg chassis_2.jpg (608.4 KB, 229 views)
File Type: jpg reg_bjt_test_4.jpg (362.8 KB, 242 views)

Last edited by greenm01; 30th March 2012 at 12:46 AM. Reason: grammer
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Old 2nd April 2012, 11:43 PM   #73
greenm01 is offline greenm01  United States
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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
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Old 3rd April 2012, 10:33 AM   #74
wintermute is online now wintermute  Australia
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ThermalTrak+TMC amp
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

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Old 3rd April 2012, 11:55 AM   #75
dadod is offline dadod  Croatia
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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, 199 views)
File Type: jpg sin-20kHz.JPG (463.9 KB, 125 views)
File Type: jpg square-10kHz.JPG (949.6 KB, 136 views)
File Type: jpg square-20kHz.JPG (918.0 KB, 152 views)
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Old 3rd April 2012, 11:59 AM   #76
dadod is offline dadod  Croatia
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Here I put 0.1uF capacitor parallel to the 8 ohm load. First 1kHz and second 20kHz.
dado
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File Type: jpg square-1kHz_0.1u.JPG (876.6 KB, 160 views)
File Type: jpg square-20kHz_0.1u.JPG (489.1 KB, 168 views)
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Old 3rd April 2012, 12:10 PM   #77
dadod is offline dadod  Croatia
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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, 173 views)
File Type: jpg 8ohm_0.1uF.JPG (523.3 KB, 148 views)
File Type: jpg 8ohm_1uF.JPG (545.5 KB, 100 views)
File Type: jpg triagle-1kHz.JPG (956.6 KB, 111 views)
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Old 4th April 2012, 04:21 AM   #78
mightydub is offline mightydub  United States
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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.
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Old 5th April 2012, 12:36 PM   #79
greenm01 is offline greenm01  United States
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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
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Old 5th April 2012, 01:27 PM   #80
AndrewT is offline AndrewT  Scotland
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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.
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