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Chip Amps Amplifiers based on integrated circuits

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Old 23rd August 2012, 09:04 AM   #181
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Bob, I was not mocking at you when I said you might want to try thermoelectric panels, they come in different sizes and shapes. But first as you have already suggested, is it a valid assumption to control the temperature, may be too much low is not an optimal performance and my idea is false, so how much low you want to go, we wait your results.
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Old 23rd August 2012, 09:20 AM   #182
bcmbob is offline bcmbob  United States
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I didn't take you comment as anything other than genuine.

I have a computer buddy who is constantly razzing me about when I'm going to start using the nitrogen. He says since it is non-conductive I should just immerse the whole thing and be done with it.

Haven't looked much at thermoelectric but I will.
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Old 23rd August 2012, 09:25 AM   #183
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Yes, with nitrogen you can over-clock it, and the only bottleneck is then the mechanical HDD Any way, I wonder what results you will get when you start cooling this chip, can you do spectrum distortion measurements while you are maintaining the chip at a specific temperature?
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Old 23rd August 2012, 09:49 AM   #184
AndrewT is offline AndrewT  Scotland
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The further away one can keep a protected/limited chipamp from triggering the protection, the better it will perform on typical dynamic range audio. The fewer clip incidents (that is both voltage clip and current clip) the better the audio performance.

Constant signal distortion measurements will not reveal this "triggering" if you avoid overloading the chip during the testing/measuring.

You are wasting your time doing THD at cool temperatures. It will not show any reduction in clipping incidents in a protected chipamp.

Based on the above a cooled chipamp should clip less often and less severely than a hot chipamp. This leads to my own conclusion. Always run the heatsink and chip as close to ambient temperature as possible for best audio performance.
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Old 23rd August 2012, 09:55 AM   #185
bcmbob is offline bcmbob  United States
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Been watching this thread and hope to use Visual Analizer at some point with the Fremen Edition.

Exploring Visual Analyser (VA)
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Old 23rd August 2012, 10:14 AM   #186
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I don't know if a GB has been arranged before, but it is certainly useful to have one. With a good sound card, this will give you a good measurement system.
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Old 23rd August 2012, 10:20 AM   #187
bcmbob is offline bcmbob  United States
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If you are referring to the VA software it is a free download.
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Old 23rd August 2012, 10:23 AM   #188
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I meant the HW. I saw an image for a schematic, I am not sure if this has to be built, as I have not read about it yet.
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Old 24th August 2012, 11:48 AM   #189
romvise is offline romvise  Italy
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Hi guys, yesterday I've started with the build.
This morning I've tried to power on both channels but the relay don't started on both.
After a check-up i've found some bad join, now both relay and led are working after power on.
Unfortunately channel "1" has some problem, when I try to measure the DC offset I found 60mV and sometime the relay cut the circuit, in this situation the DC offset become 5V!
On C101/C102 I've +/-32.7V.
I've attached two pictures of this channel

The channel "2" has 10mV DC offset so I presume it's correctly working.

Thank a lot for any suggestion.
R.
Attached Images
File Type: jpg pcb1_front.jpg (910.5 KB, 208 views)
File Type: jpg pcb1_back.JPG (941.4 KB, 197 views)
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Old 24th August 2012, 11:57 AM   #190
AndrewT is offline AndrewT  Scotland
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attach a dummy load, 10k, across the speaker output.
Check the offsets again.
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