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637 Amplifiers
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Old 6th September 2012, 03:49 PM   #91
quanghao is offline quanghao  Viet Nam
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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, 1043 views)
File Type: jpg 637-2.jpg (142.6 KB, 943 views)
File Type: jpg 637.3.jpg (144.8 KB, 868 views)
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Old 7th September 2012, 03:51 PM   #92
quanghao is offline quanghao  Viet Nam
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a few more pictures, many thanks!
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File Type: jpg 33.jpg (177.8 KB, 812 views)
File Type: jpg 48.jpg (164.3 KB, 764 views)
File Type: jpg 555.jpg (186.2 KB, 303 views)
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Old 12th January 2013, 10:28 PM   #93
quanghao is offline quanghao  Viet Nam
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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, 543 views)
File Type: jpg CS-637.1.jpg (644.6 KB, 526 views)
File Type: jpg Supply-637.4.jpg (588.5 KB, 425 views)
File Type: jpg Supply-637.9.jpg (712.1 KB, 406 views)
File Type: jpg Supply-637.10.jpg (651.4 KB, 377 views)
File Type: jpg Supply-637.11.jpg (664.0 KB, 328 views)
File Type: jpg Supply-637.7.jpg (783.8 KB, 394 views)
File Type: jpg Supply-637.5.jpg (872.1 KB, 437 views)
File Type: jpg Supply-637.3.jpg (620.5 KB, 364 views)
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Old 13th January 2013, 05:53 AM   #94
keantoken is offline keantoken  United States
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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, 06:01 AM   #95
keantoken is offline keantoken  United States
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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, 09:45 AM   #96
tommy1000 is offline tommy1000  Denmark
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Nice work. Are the toroidal transformers in the power supply epoxy potted?

Last edited by tommy1000; 13th January 2013 at 09:48 AM.
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Old 13th January 2013, 10:17 AM   #97
quanghao is offline quanghao  Viet Nam
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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

Last edited by quanghao; 13th January 2013 at 10:22 AM.
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Old 13th January 2013, 10:18 AM   #98
quanghao is offline quanghao  Viet Nam
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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, 03:50 PM   #99
tommy1000 is offline tommy1000  Denmark
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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, 04:02 PM   #100
TANDBERGEREN is offline TANDBERGEREN  Norway
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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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