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17th February 2011, 11:52 AM
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#1 |
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diyAudio Member
Join Date: Sep 2008
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Signal limiting/clipping
Hi,
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? Thanks |
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