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Old 17th February 2011, 11:52 AM   #1
jason12 is offline jason12  United States
diyAudio Member
Join Date: Sep 2008
Default Signal limiting/clipping


Here is part of Kenwood C2 preamp schematic. This particular flat amp seems to limit/clip input signals with levels exceeding 500mV. This number is an estimate since at the moment I do not have an access to test equipment. It appears not to limit signals with "consumer" levels of -10db. However anything above -4db is clipped. Clipping is symmetrical as far as I can see in the wave editor.

The components are:
Q5, Q6 - uPA68H
Q7-Q10 - 2SC1845F
IC2 - NJM2041.

Supply voltage is +/- 18VDC. All DC voltages are as referenced in schematic. Seems to me it is something relating to BJTs in cascode. Just can not grasp it.

Any idea, please?

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Old 17th February 2011, 02:45 PM   #2
jason12 is offline jason12  United States
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Join Date: Sep 2008
Q5, Q6 - uPA68H (N or M) with Idss 9 ~ 18mA.
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Old 20th February 2011, 12:54 AM   #3
jason12 is offline jason12  United States
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Join Date: Sep 2008
Turned out there is nothing wrong with it. Something else was broken.
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