Twisted Sibling - THS4131 based preamp/buffer/SE-BAL converter - Page 2 - diyAudio
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Old 22nd May 2006, 10:19 PM   #11
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And the very plain front.
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Old 22nd May 2006, 10:29 PM   #12
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the opa1632 is apparently the same chip and cost way cheaper than the ths4131.
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Old 23rd May 2006, 01:10 AM   #13
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Quote:
Originally posted by 00940
the opa1632 is apparently the same chip and cost way cheaper than the ths4131.
Similar, yes very much so, the same no.
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Old 23rd May 2006, 01:46 AM   #14
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Ben,
The beautiful thing is that the OPA1632 and a few other ICs will work just fine in this circuit.



Cheers!
Russ
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Old 23rd May 2006, 07:46 AM   #15
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Quote:
Originally posted by Russ White


Similar, yes very much so, the same no.
The question was raised here : OPA1632 and THS4131

You got more info from other sources ? The specs are so amazingly similar...
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Old 23rd May 2006, 11:39 AM   #16
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I will call TI today to find out, but I can see some differences in the data sheet (though not many and not by much) but the big thing is that the THS413x data sheet specifically states this:

Quote:
The THS413x is one in a family of fully-differential input/differential output devices fabricated using Texas Instruments' state-of-the-art BiComI complementary bipolar process.
Where as the OPA1632 does not.

Does that mean anything? Well who knows. But in the end both chips are cheap and you can use either one. So am not sure how it makes any difference.

I will call TI today and ask, just to satisfy my curiosity.

:EDIT: missed most of the quote.

Cheers!
Russ
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Old 23rd May 2006, 07:02 PM   #17
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One obvious difference is that the 4131 and its brothers have
an internal control for common mode offset, and the 1632 is
external.
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Old 30th May 2006, 09:59 PM   #18
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I would be glad if you post the pcb pdf.
Thank you
Giorgio
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Old 31st May 2006, 06:09 PM   #19
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Quote:
Originally posted by patriz
I would be glad if you post the pcb pdf.
Thank you
Giorgio

Your wish is granted.

The copper PDF is not mirrored (for toner transfer).

The silk PDF is mirrored (also for toner transfer).

Enjoy!
PDFs

Cheers!
Russ
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Old 31st May 2006, 07:56 PM   #20
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great!!!!
Thanks a lot.
Giorgio
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