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Old 1st January 2013, 01:20 AM   #631
DRZ1 is offline DRZ1  Canada
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It work Jean , it work very well, even at Quebec City.....i have two of them.

so i solve my temp tracking problems by changing the NPN output and all goes well. There really a production problem with some of this transistors and it fall on me.

Click the image to open in full size.

Click the image to open in full size.
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Old 1st January 2013, 01:44 AM   #632
jprco is offline jprco  Canada
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Thanks, Denis. Nice job with your amp.
I know it does work very well despite the differences in temperature between the channels. I'm concerned with stability and I'm just hoping that I don't have to rip one or both sides apart to fix whatever bug is.
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Old 1st January 2013, 11:00 AM   #633
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Jean: you have to bypass the TT-diode with the highest Vf on each channel!

I labelled the corresponding transistor in the German group-buy; that is why the German builds work right from the start!

Best regards - Rudi
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Old 1st January 2013, 11:15 AM   #634
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Franz: Gerhard is a very skilled DIYer; he knows of course that the heatsinks have to be mounted vertically!
The picture only shows a very preliminary build.

Best regards - Rudi

P.S. Dennis: I cannot see your pictures!
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Old 1st January 2013, 11:32 AM   #635
brianco is offline brianco  Ireland
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Quote:
Originally Posted by DRZ1 View Post
It work Jean , it work very well, even at Quebec City.....i have two of them.

so i solve my temp tracking problems by changing the NPN output and all goes well. There really a production problem with some of this transistors and it fall on me.

Click the image to open in full size.

Click the image to open in full size.

Pictures not opening.
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Old 1st January 2013, 11:37 AM   #636
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Brian: please attach (using the paper-clip) the pictures to your post. The pictures still won't open.

Rudi
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Old 1st January 2013, 12:06 PM   #637
jprco is offline jprco  Canada
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Rudi, I know I have to bypass the highest Vf, I was just trying to bypass the "odd" NJL to see if I could resolve the heat differences. Since nothing measurable seems to explain the differences in heat sink temperatures, I guess I will have to line with one side at 45-50C and the other side at 60-65C until something gives! It this okay???
I will look for more NJL's and try to match them like Denis seems to suggest.
2013 is here.
Jean
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Old 1st January 2013, 12:22 PM   #638
lucylu is offline lucylu  England
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Hi I have now measured my DC offset correctly ,amp on ,,speakers disconnected, left channel .4 and plays music,,,,,but right channel 33.4 volts does not play ,,,what do i look for ? thanks john
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Old 1st January 2013, 04:36 PM   #639
DRZ1 is offline DRZ1  Canada
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Quote:
Originally Posted by jprco View Post
Rudi, I know I have to bypass the highest Vf, I was just trying to bypass the "odd" NJL to see if I could resolve the heat differences. Since nothing measurable seems to explain the differences in heat sink temperatures, I guess I will have to line with one side at 45-50C and the other side at 60-65C until something gives! It this okay???
I will look for more NJL's and try to match them like Denis seems to suggest.
2013 is here.
Jean
Theres many things that can cause this problem.

1- check the current in each branch of the output for be sure that each transistor sink the same current.

2- If not equal, be sure that ALL transistors (output and drivers) are tight on the heatsink, a loose transistor will overheat and will affect the compensation of all others too.

3- Dependly of the heatsink used and the physical location of output transistors on it, you MUST short a thermal track diode at the SAME side of heatsink.
Ex. if you decide to keep 2 diodes on the upper side of the heatsink, you will have a NPN shorted on one side and a PNP shorted on the other side. This is CRITICAL to have the channels compensation working the same on each side because the upper of heatsink is hotter than the base.
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Old 1st January 2013, 05:10 PM   #640
DRZ1 is offline DRZ1  Canada
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here it is
Attached Images
File Type: jpg fc100-2.jpg (336.7 KB, 169 views)
File Type: jpg fc100-1.jpg (253.4 KB, 166 views)
File Type: jpg fc100-3.jpg (335.2 KB, 192 views)
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