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#91 |
diyAudio Member
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One channel at a time.
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#92 |
diyAudio Member
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Ok, started it, but :-(... I have: +/- 33.7V rail, DC on output -6.2V, voltage on source resistors(1ohm) -- 0.35V. R8(R11) source of Q3. --5.2V, R14(R18) -- 4.75V.
(BrianGT boards notation). So everything looks perfect except DC offset. My Q1 and Q2 are matched perfectly, but I have a 100k R8(R6) resistor, maybe it is it? ![]() |
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#93 |
diyAudio Member
Join Date: Jun 2004
Location: ARKANSAS
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Is that 6V of DC offset?
Is that at initial start up? Also, did it settle any after running for a few minutes?
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#94 |
diyAudio Member
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Ok, i removed R8, DC offset dropped to -16mV, but after 3 min of working rising again, now it is -28mV :-(
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#95 |
Official Court Jester
diyAudio Member
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everything up to 100mV is considered as OK
still - lesser is better
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#96 |
diyAudio Member
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Anything i can do to reduce it? My input pars were matched super close.
-35 mV still going up... :-( |
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#97 |
Official Court Jester
diyAudio Member
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ya have Algar_emi's Aleph pdf ?
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#98 |
diyAudio Member
Join Date: Jun 2004
Location: ARKANSAS
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Let her run for a bit and settle down, and measure it then.
Like they said 35mv is not really "bad", but it will change after warmup so let her run some now. Steve
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#99 |
diyAudio Member
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#100 |
Official Court Jester
diyAudio Member
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.
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