Rank: Member
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Joined: 4/27/2012(UTC)
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Location: Canada
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I have been enjoying my Buffalo II + IVY III for many months now using the single ended output. Thank you for releasing this splendid DAC!
Recently I built a 4-channel headphone amp and connected it to the IVY's balanced outputs. I noticed that the music on the left side was softer. I played a 60hz tone and measured the AC voltages at the IVY's outputs. Most of it seemed normal (~0.7V for balanced, ~1.4V for SE), except for L+ which was ~0.13V.
When disconnected from the amp (i.e. no load) then L+ jumped back to the expected ~0.7V. But measuring the output pins of IC2 directly yielded ~0.7V for both L+ and L- even when IVY was connected to the amp.
At first I thought it was something in the amp or interconnect. But when swapping the left and right, the fault switched sides at the amp but remained at L+ on the IVY. Still I fully acknowledge the strong possibility that I screwed something up while testing my amp, and that may have sent feedback to damage the IVY.
Any suggestions on what I can do to fix this?
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Rank: Member
Groups: Member
Joined: 4/27/2012(UTC)
Posts: 3
Location: Canada
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If no one has any better ideas, I'll try replacing IC2 (OPA1632D), C1, and C2.
Does that sound sensible? Thanks.
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Rank: Administration
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Joined: 10/24/2006(UTC)
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Originally Posted by: Yoga Flame  If no one has any better ideas, I'll try replacing IC2 (OPA1632D), C1, and C2.
Does that sound sensible? Thanks. Worth a shot, you should also check the output of the DAC itself with no output stage.
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Rank: Member
Groups: Member
Joined: 4/27/2012(UTC)
Posts: 3
Location: Canada
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Much appreciated, Russ.
I am embarrassed to have to admit that after doing the parts replacement, I discovered that the problem was with my interconnect cable after all. I could have sworn I ruled this out by swapping the cables before. Turns out the L+ and G pins on the cable were mixed up. I don't know how I could have missed that.
Sorry if I caused anyone to share in my confusion.
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