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Old 26th January 2014, 07:14 PM   #31
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Seems the problem simply is input common-mode range. The TLE2072 is given with +5/-1.9 V typical on a +/-5 V supply, and there's a unity gain buffer in there that has to swing down to -2.83 V, as do its inputs. Which would correlate with distortion setting in a little under the -3 dBFS mark. The NJM5532 typically does +/- 3 V under the same conditions, hence no problems. (Got any mean >0 dBFS test signals like that fs/4, 90 sine? That ought to be it.)

For kicks, one could try a TL072... Inversion time!

Clearly a case of "plug'n'pray". Those are the perils of low supply voltages and non-RRIO opamps.
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Old 26th January 2014, 08:33 PM   #32
BYRTT is offline BYRTT  Denmark
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So in this "plug and play electric" case seems only a voltage problem ("plug and play hardware" also needed attention where Mooly did a converter).
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Old 27th January 2014, 06:34 AM   #33
PMA is offline PMA  Europe
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The distortion profile clearly showed clipping, as I have already mentioned.
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Old 28th January 2014, 09:52 AM   #34
Mooly is online now Mooly  United Kingdom
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Something different,
John Curl's Blowtorch preamplifier part II
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