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Old 15th February 2009, 03:51 AM   #121
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Hello
I have some extra THAD 1646 chip which even measure better than the DRV-134 .
You can look up the test on the net.
You can use as a replacement one by one to replace the DRV-134 chip.
The price for 1 chip $6.50
Greetings
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Old 15th February 2009, 04:43 AM   #122
Coulomb is offline Coulomb  England
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Location: Ancaster, Ontario
Quote:
Originally posted by gaborbela
Hello
I have some extra THAD 1646 chip which even measure better than the DRV-134 .
You can look up the test on the net.
You can use as a replacement one by one to replace the DRV-134 chip.
The price for 1 chip $6.50
Greetings
THAT 1646 not THAD 1646

MFR P/N 1646P08-U

Anthony
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Old 15th February 2009, 04:56 AM   #123
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Quote:
Originally posted by CJ900RR
See this website. Both schematic shown there works like a charm!

http://sound.westhost.com/project14.htm
Improved versions have been posted at:
http://sound.westhost.com/project87.htm
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Old 15th February 2009, 10:12 AM   #124
CJ900RR is offline CJ900RR  Sweden
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Quote:
Originally posted by TheSeekerr


Improved versions have been posted at:
http://sound.westhost.com/project87.htm

No!

That is almost the same as the equivalent schematic as the DRV134 and will converts single-ended, ground-referenced input to a floating differential output with +6dB gain (G = 2).

Rod Elliotts schematic:
Click the image to open in full size.

DRV134 equivalent schematic:
Click the image to open in full size.

DRV134, SSM2142 and THAT1646 all converts single-ended, ground-referenced input to a floating differential output, witch is good when you have a balanced receiver in the other end. But to bridge two amplifiers you need a bridging adapter, such as Rod Elliotts project 14.
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Old 15th February 2009, 12:13 PM   #125
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Join Date: Sep 2005
Hello
My mistake is THAT 1646 I have a couple of extra .
I needed to order 20PC to get bit lower price ,I just need 2PC .
I sold some of them but I still have 6or 8PC EXTRA .
If someone search for these chip I have some .
Greetings
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Old 15th February 2009, 09:11 PM   #126
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Hi CJ900RR,

While the schematic published on that page produces a floating output, the boards which can be purchased for P87b do not - this can be seen in the schematic on the secure section of his website, which I unfortunately cannot publish here.
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Old 15th February 2009, 09:29 PM   #127
CJ900RR is offline CJ900RR  Sweden
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Hi Seekerr.

Sorry I didn't know that, thank you for making that clear

I did read that he states that the boards for P87b can be used as a bridging adapter on the site for project 14, but I thought that people might misunderstood that the schematic on P87 is the same thing as P14.

But anyhow, the PCB's for P87B can be used as a bridging adapter, if you use the schematic in figure 2 shown at P14, or if you have access to the secure section of the site
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Old 26th July 2009, 07:57 AM   #128
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Default bridging using balanced outputs

Question.

If the preamp is already fit with balanced output, could you bridge two standard gainclones (briangt's LM3886) directly??

Gerard
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Old 26th July 2009, 03:08 PM   #129
nickytl is offline nickytl  Ireland
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hi seems i still cant email folks o sorry for adding to this thread but,
Gaborbela: Do you by any chance have any of the THAD1646 chips left for sale? If so please email me.
many thanks
Nick
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Old 5th August 2009, 06:31 PM   #130
juluska is offline juluska  Ukraine
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Join Date: May 2008
Quote:
Originally posted by CJ900RR
See this website. Both schematic shown there works like a charm!

http://sound.westhost.com/project14.htm

I'm building the bpa300 amplifier, but i have problems with drv134 noise, so
i'm studying the possibility of bridging PA150 pcbs with ESP project 14. IT seems easy to do for me in a protoboard and point to point, but i have a doubt. Can i put a simple pot just before these circuit to avoid any preamplifier? What is the input impedance of this circuit?
Thanks
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