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Old Yesterday, 06:14 PM   #1
wertz is offline wertz  Philippines
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Default what do you think of this design?

hi. please evaluate this amp design. this is a schematic i made from my amp, in an attempt to understand why offset on left channel is 10mV while the other one is 0mV. anyways assuming i made no error in making the schematic, is this a good design? also i can't seem understand also why T7 is wired like that?

what is possible replacement for C4468/A1695 just incase this thing breaks...
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Old Yesterday, 06:29 PM   #2
Mooly is offline Mooly  United Kingdom
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There are quite a few errors in the diagram for it to even get close to working. T4 is drawn incorrectly wired (B-E should be across R6), the bias generator is all 'upside down' and one of the 2N5551's (can't make the ref number out) is incorrect. T13 is a 2SA (just a typo).

T7, I have seen that kind of configuration before... it is odd. Offset at 10mv sounds absolutely fine for this and variations are normal and down to simple (unavoidable) mismatching around the input stage. It is of no consequence.
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Old Yesterday, 06:35 PM   #3
rayma is offline rayma  United States
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Originally Posted by wertz View Post
why T7 is wired like that?
It's connected as a cascode. Also, 10mV is a small (and normal) amount of offset.
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Old Yesterday, 07:46 PM   #4
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T4,T8 and T9 collector and emitter are reversed. The ltp ccs will only generate ~15uA, R6 is probably incorrect value. No idea what R3 is for. R12, C9 on the wrong side of R10. C11 polarity reversed.

Last edited by jerluwoo; Yesterday at 07:58 PM.
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