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Old 14th June 2011, 09:01 PM   #81
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Here are the correct measurements perys | perys - hqqf_osc_finalverze-8R550mA-sin ? rajce.net
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Old 14th June 2011, 09:30 PM   #82
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Originally Posted by Federmann View Post
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I`m certain that Low OL gain is the problem
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Old 14th June 2011, 10:04 PM   #83
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I`m certain that Low OL gain is the problem
No problem can be different.
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Old 14th June 2011, 10:12 PM   #84
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Originally Posted by lgs View Post
Measured amplifier is my property. My people completed it from modules delivered by Mr. Federmann. He also supervised assembling process.
We made small party where we did also listening test. On this party was the amp measured by PMA (see the link above). Because time was limited for proper measurement, Flyingbird offered me to do complete test in his home. Result you can find on valachnet link.
Thanks LGS (and everyone else)

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LGS have a faulty output filter, output filter to fix, and then Measure. LGS was informed long ago.

Federman, this is just an observation, however you would I think do yourself a favour by stating this at the outset, rather than just dismissing sendy's post.

If the output filter is part of the module you sold (It doesn't look like it from the pictures of the circuit board) then you would do yourself an even bigger favour by admitting to having provided a faulty module (I don't know if it is on or off board).

Anyone selling something needs to have customer service in the forefront of their thoughts. We are a tough crowd here at diyAudio and sometimes just admitting a mistake, apologizing and offering the solution to fix it will win you more respect than you could imagine If you aren't at fault then simply offering assistance to solve the problem will also do wonders.

You obviously strongly believe in your product, If you work with the people who are questioning it rather than against them I think you will be much more likely to succeed

All just in my opinion of course

Tony.
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Old 14th June 2011, 10:27 PM   #85
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I've tried repeatedly to fix the module. The patch was no interest. Dealers said other material - ferrite for the output filter. Measurements under these conditions was not right.
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Old 15th June 2011, 08:23 AM   #86
Sendy is offline Sendy  Czech Republic
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Federmann, "perys amplifier" is off topic.... amplifier with yours PCB, but half supply voltage, large external supply filter caps, other compensation, other opamp, and 5x higher quiescent current !!!

I think it was a long way from HQQF to "perys HQQF"...
perys | perys - hqqf_osc_klidovy-proud ? rajce.net

Last edited by Sendy; 15th June 2011 at 08:25 AM.
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Old 15th June 2011, 06:00 PM   #87
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Quote:
Originally Posted by Sendy View Post
Federmann, "perys amplifier" is off topic.... amplifier with yours PCB, but half supply voltage, large external supply filter caps, other compensation, other opamp, and 5x higher quiescent current !!!

I think it was a long way from HQQF to "perys HQQF"...
perys | perys - hqqf_osc_klidovy-proud ? rajce.net

You are wrong. Many measurements done here.
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Old 16th June 2011, 11:20 AM   #88
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What about IMD and THD vs. frequency, THD vs. level ?
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Old 16th June 2011, 11:00 PM   #89
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Old 17th June 2011, 08:59 AM   #90
Sendy is offline Sendy  Czech Republic
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PLS, send something real, not Fata Morgana, not Manifesto of the Communist Party.
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