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Hooked up the CP's today, checked the power supply and it was putting out 12v, jumpered the resistors on the LCBPS and the voltage went up to 14.2v; good enough for now I guess. There was a horrible hum which I eventually removed by connecting the mains ground. The DAC is currently mounted to a wood plank for testing, which is why it wasn't connected. Checked the DC offset, I got the following: Ref'd to ground: out-: -78mv out+: -32mv between out- and out+: 30mv out-: -88mv out+: -14mv between out- and out+: 35mv I'm not sure what steps I should take to try to fix the offset, any help would be great. I hooked up the dac to a set of cheap amp/speakers, and it sounds pretty good aside from some faint buzzing. edit: the buzzing seems to be related to mounting locations and wire routing, will try to reroute some of my wiring. Edited by user Sunday, April 26, 2009 2:57:17 PM(UTC)
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If you have that much offset I would recommend you use output caps.
The Humm/buzz definitely sounds like a GND loop or maybe EMI.
Cheers!
Russ
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Rank: Advanced Member
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Joined: 7/30/2007(UTC)
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For output caps I simply hook them in series from the terminal block to the wire, correct? I know it's probably obvious, but I just want to double check before I do it. For grounding wiring, whats the best way you have found to wire the grounds? Edited by user Monday, April 27, 2009 2:59:50 AM(UTC)
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