My first lm3875 - diyAudio
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Old 5th December 2012, 06:18 AM   #1
scrazy is offline scrazy  Taiwan
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Join Date: Apr 2001
Location: Taiwan
Default My first lm3875

The sound is very good!
The dc offset 50mv,40mv seems too high?
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Old 5th December 2012, 08:28 AM   #2
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Join Date: Mar 2009
Nice build, I like those chassis.

Not at all. Those values are well within the safe range.

Edit: Do you plan on picking up the "magical" resistors as recommended?

Last edited by chipzahoy; 5th December 2012 at 08:43 AM.
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Old 5th December 2012, 09:10 AM   #3
scrazy is offline scrazy  Taiwan
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Join Date: Apr 2001
Location: Taiwan
more pictures...
This is my test set, I'll testing Cin when my caps received , and rewire the connection , add a copper plate at the bottom.
I use Cin because : http://www.rexdiy.com/smf2/index.php?topic=432.0

The toroid is from Tamela 18v 225va.
There're some strange thing, when lm3875 turn off,I turn on the preamp, there're some loud noise from the speaker, after about 6 secs ,then dead silent.
So I turn on lm3875, and all works fine.
no idea...
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File Type: jpg 2012-12-03 16.00.22.jpg (457.6 KB, 260 views)

Last edited by scrazy; 5th December 2012 at 09:21 AM.
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Old 5th December 2012, 04:58 PM   #4
scrazy is offline scrazy  Taiwan
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Join Date: Apr 2001
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chipzahoy:
What do you mean the "magical" resistors ?
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Old 5th December 2012, 05:16 PM   #5
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The TX2575, use them@Rf and R3!
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