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Old 8th July 2011, 03:11 PM   #2381
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Sometimes Opamps get hot although they are not in full oscillation. You could try to increase C19, C20 a bit or play with R3, R20, C3, C4.
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Old 10th July 2011, 06:27 AM   #2382
hesener is offline hesener  Germany
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will do (unfortunately only next week as I am travelling - I hate to leave unfinished business in the lab..... fingers tickling....)
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Old 14th July 2011, 12:57 AM   #2383
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This time i am publishing only a fragment, I am into a thinking process to make a transimpedance phono stage with no DC into the cartridge without trimming or offset cancelation. The whole stage should be DC coupled again without trimming. The RIAA should be AIOG. Certain elements have being published by me before. Do you think what i think ....
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Old 14th July 2011, 08:27 PM   #2384
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I am building just another Ultra Low Noise Pre-Pre.
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Old 14th July 2011, 09:02 PM   #2385
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Hi Joachim,
just can't wait......
"No adjustment...."
Sounds apealing to me.

Regards
peter
(remember, the FF2011?)
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Old 14th July 2011, 10:51 PM   #2386
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How could i forget the FF2011 ? The FFs are my only vacation the last 5 years.
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Old 16th July 2011, 08:42 PM   #2387
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I got the MM stage of the FF2011 working. There where two bugs in the PSU so we could not make it work on FF2011. I am now locking into the MC input. There is a bias problem. The MM section sounds just fine. Very low noise and distortion and the rather prosaic LM49710 works very well with the slightly warm floating cascode buffer. Klaus, your layout work is beautiful.
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Old 16th July 2011, 08:54 PM   #2388
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Here are some pictures ....
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Old 16th July 2011, 08:55 PM   #2389
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.....
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Old 19th July 2011, 12:26 PM   #2390
hesener is offline hesener  Germany
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my FPS is working now, after a few more fixes (my problems, really....) Current consumption is around 210mA so I had to beef up my shunt regulators a little bit.

Measured the no-load current of 30 opamps and they deviated between 4.3mA and 4.6mA, with the occasional device at 4.9mA (using the schematic from the datasheet, voltage follower with input tied to ground, no load). That didnt explain the differences in temperature (today, 41C ...70C). Now I will try the suggestions from post #2381
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