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Old 6th September 2012, 02:49 PM   #91
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i have some picture of driver 637 amli,
please see it!
thanks
Attached Images
File Type: jpg 6371.jpg (148.8 KB, 874 views)
File Type: jpg 637-2.jpg (142.6 KB, 787 views)
File Type: jpg 637.3.jpg (144.8 KB, 721 views)
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Old 7th September 2012, 02:51 PM   #92
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a few more pictures, many thanks!
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File Type: jpg 33.jpg (177.8 KB, 665 views)
File Type: jpg 48.jpg (164.3 KB, 628 views)
File Type: jpg 555.jpg (186.2 KB, 254 views)
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Old 12th January 2013, 09:28 PM   #93
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hi all!

take quite some time, and I finally completed amplifier 637, with such modifications and certain combinations, to invite you to view images!
Thank you
Attached Images
File Type: jpg CS2.jpg (545.9 KB, 449 views)
File Type: jpg CS-637.1.jpg (644.6 KB, 433 views)
File Type: jpg Supply-637.4.jpg (588.5 KB, 349 views)
File Type: jpg Supply-637.9.jpg (712.1 KB, 332 views)
File Type: jpg Supply-637.10.jpg (651.4 KB, 308 views)
File Type: jpg Supply-637.11.jpg (664.0 KB, 262 views)
File Type: jpg Supply-637.7.jpg (783.8 KB, 325 views)
File Type: jpg Supply-637.5.jpg (872.1 KB, 367 views)
File Type: jpg Supply-637.3.jpg (620.5 KB, 302 views)
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Old 13th January 2013, 04:53 AM   #94
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That is really neat, but my original comments still apply. This circuit is not like the OPA637. The special thing about the OPA637 is the input stage, everything else is conventional. This amp should not be named after the opamp; that is just misleading.
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Old 13th January 2013, 05:01 AM   #95
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Hey, which ferrite beads do you use for your FETs? Are they on both pins except the gate? Anyway it's an extremely nice build and looks incredible. Did you get the chassis from siliconray perhaps?

From your latest schematics it looks like this amp is a tweaked Goldmund clone rather than an OPA637.
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Old 13th January 2013, 08:45 AM   #96
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Nice work. Are the toroidal transformers in the power supply epoxy potted?
Last edited by tommy1000; 13th January 2013 at 08:48 AM.
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Old 13th January 2013, 09:17 AM   #97
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Quote:
Originally Posted by keantoken View Post
Hey, which ferrite beads do you use for your FETs? Are they on both pins except the gate? Anyway it's an extremely nice build and looks incredible. Did you get the chassis from siliconray perhaps?

From your latest schematics it looks like this amp is a tweaked Goldmund clone rather than an OPA637.
yes, I see Gm and Anthony.E.Holton amli, all is one design.
All from topo symmetrical
Maybe I copy Too

I buy chaissic from China.

Thanks
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Last edited by quanghao; 13th January 2013 at 09:22 AM.
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Old 13th January 2013, 09:18 AM   #98
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Quote:
Originally Posted by tommy1000 View Post
Nice work. Are the toroidal transformers in the power supply epoxy potted?
power transformer is because Vietnamese people, wrap,
I use two power transformers 0 - 58.5 V x 1A for one chanel.

Thanks
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Old 13th January 2013, 02:50 PM   #99
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Quote:
Originally Posted by quanghao View Post
I use two power transformers 0 - 58.5 V x 1A for one chanel.
1A ?? Are you shure? You have 12 pcs of expensive power mosfets for each channel.
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Old 13th January 2013, 03:02 PM   #100
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Quote:
Originally Posted by tommy1000 View Post
1A ?? Are you shure? You have 12 pcs of expensive power mosfets for each channel.
I would guessed 1KVA
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