Gtlab Forum
Тематический => Гитарные усилители и примочки => Тема начата: mensur от Августа 05, 2009, 10:41:02 am
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Hi guys,
I made a hybrid amp. Roccaforte preamp and 100W MOSFET (TDA7294) SS amp.
I designed PCB (for the rocca and TDA):
Roccaforte Schematic & PCB.pdf (http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Roccaforte%20Schematic%20%26%20PCB.pdf)
Some pics:
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fwww.fileden.com%2Ffiles%2F2008%2F12%2F25%2F2237836%2FRoccaforte%2FImage000.jpg&hash=879ff2aad597b3efaab22d2bd78204aa75d635aa)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fwww.fileden.com%2Ffiles%2F2008%2F12%2F25%2F2237836%2FRoccaforte%2FImage001.jpg&hash=6e2fc6c8cfdc0b68e6f35cba4608d59d3d12076c)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fwww.fileden.com%2Ffiles%2F2008%2F12%2F25%2F2237836%2FRoccaforte%2FImage007.jpg&hash=7990b9276d8784a209526e95a37a5cbd848aa953)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fwww.fileden.com%2Ffiles%2F2008%2F12%2F25%2F2237836%2FRoccaforte%2FImage009.jpg&hash=b3872438b5af737ef26954fa501f52ad043f7731)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fwww.fileden.com%2Ffiles%2F2008%2F12%2F25%2F2237836%2FRoccaforte%2FImage012.jpg&hash=5331703b76c58dde6f95bd98b4a588865d984ee0)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fwww.fileden.com%2Ffiles%2F2008%2F12%2F25%2F2237836%2FRoccaforte%2FImage013.jpg&hash=1608b931e516a369b38150fef633a657a1186f76)
But I have a problem, I have noise and hum in the amp, here is sample:
Rocca Problem.mp3 (http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Rocca%20Problem.mp3)
and here is layout how i connected the amp,internally:
Rocca Layout.pdf (http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Rocca%20Layout.pdf)
What can be the problem? Help me to solve this.
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http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Roccaforte%20Schematic%20%26%20PCB.pdf
file not found :-?
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блин звук г... залей нормальный семпл.. у меня тож тот файл не открывается
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Все что я услышал, дикий возбуд, дикий фон и хороший звук преда ;)
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блин звук г... залей нормальный семпл.. у меня тож тот файл не открывается
он тебя врятли понял ;)
а семпл нормальный, показывает все что нада :P
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как то тиховато и шумно.... атак сам по себе семпл норм))
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http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Roccaforte%20Schematic%20%26%20PCB.pdf
file not found :-?
Roccaforte Project.pdf (http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Roccaforte%20Project.pdf)
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mensur, filter cap must be after R15 (as 47u after R8)
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Hi. Please decrease size of your pictures. Preview of the pictures will be better.
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As i can see on PCB, the heater's feed is AC, whithout "middle point" This may cause that noise.
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Hi guys, I solved the problem, so here are the samples (recorded with cheap PC mic):
Ultra Sample1.mp3 (http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Ultra%20Sample1.mp3) - dry
Ultra Sample.mp3 (http://www.fileden.com/files/2008/12/25/2237836/Roccaforte/Ultra%20Sample.mp3) - wet
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So, where was that problem? :-?
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The problem was AC hum from the heather supply, I just DC-ed it(6.3VDC,old Hi-Fi trick), and it works great.
Here are the pics of the amp:
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fimg188.imageshack.us%2Fimg188%2F4162%2Fdsc00015ifu.th.jpg&hash=2113d395a54000a97c608f9958d86270c6014eae) (http://img188.imageshack.us/i/dsc00015ifu.jpg/)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fimg210.imageshack.us%2Fimg210%2F91%2Fdsc00014m.th.jpg&hash=a3e52f2d21f76c63f5427974f67bd1a2bdb1e405) (http://img210.imageshack.us/i/dsc00014m.jpg/)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fimg81.imageshack.us%2Fimg81%2F8362%2Fdsc00013ais.th.jpg&hash=604069309def180ce3987ea5f63e1eff75b9f334) (http://img81.imageshack.us/i/dsc00013ais.jpg/)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fimg34.imageshack.us%2Fimg34%2F4617%2Fdsc00012its.th.jpg&hash=749661b8a36646102c2fcc432225eab5285bf78a) (http://img34.imageshack.us/i/dsc00012its.jpg/)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fimg30.imageshack.us%2Fimg30%2F8572%2Fdsc00011him.th.jpg&hash=17c5c2f67b4478868aa19dc46446d7854bf9a968) (http://img30.imageshack.us/i/dsc00011him.jpg/)
(https://guitartonelab.ru/proxy.php?request=http%3A%2F%2Fimg81.imageshack.us%2Fimg81%2F3333%2Fdsc00007u.th.jpg&hash=1b3888da609e80681da365c279a0b79c03115f03) (http://img81.imageshack.us/i/dsc00007u.jpg/)