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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 23rd May 2020, 05:36 PM   #5131
dabochkarev is offline dabochkarev  Russian Federation
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Voltage drops across R7 and R8 are constant while output DC voltage dances from 0 to 10 mV.
What could have happened to it?
Why can it be so unstable?
Other channel is good, output offset is stable.
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Old 23rd May 2020, 06:02 PM   #5132
Zen Mod is offline Zen Mod  Serbia
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Aleph J illustrated build guide
since you have mosfets on wires, it' easy to unscrew pcb and inspect all solder joints

re-do anything looking suspicious
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Old 24th May 2020, 12:52 PM   #5133
dabochkarev is offline dabochkarev  Russian Federation
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I have replaced: Q2,Q3,Q3, all trimpots, R30(1kOhm) and nothing helps.
Bias sets correctly, offset is jumping.
Rails 22.7V-0V-23.1V.
Solder is clean, without shorts.
Now i have no idea, how to fix it.
Please, help me!JPEG_20200524_165128_8094643759477494907.jpg
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Old 24th May 2020, 01:13 PM   #5134
Snaffe is offline Snaffe  Denmark
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Default Impressive work

Now I am really running out of excuses for not building this amp.
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Old 24th May 2020, 01:33 PM   #5135
Zen Mod is offline Zen Mod  Serbia
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Aleph J illustrated build guide
try adding two 1nF caps

see in enclosed pdf where to put them
Attached Files
File Type: pdf Aleph30 by Algar_emi.pdf (29.9 KB, 31 views)
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