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polycro  
#1 Posted : Thursday, June 20, 2019 3:31:44 PM(UTC)
polycro

Rank: Member

Groups: Member
Joined: 9/24/2009(UTC)
Posts: 3
Location: Greece

After a long long time a have a problem with my bufalo32s.
On the output stage of OPA1632(left channel only),i have 10mv dc offset.
Τhis leads to whistling and lower volume on the left channel.
One cause may be the three perimeter mounted power supplies
Placid HD Bipolar Supply(which have been upgraded relatively recently),
and they produce enough heat and may created the problem.
Τhere is sufficient ventilation, but again the heat of all three power supplies is enough.
I have ordered a new one OPA1632, and I will go into the process to change it.
Near to OPA1632 there are two smd small capacitors.
Are they likely to have a problem?
If they have to be changed, what value they have?
I do not know if I treat it correctly, or I should look for something else on the circuit.
I would like your help, thank you.
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