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DC offset playing DSD files - felipe
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felipe  
#101 Posted : Wednesday, February 24, 2016 12:33:38 PM(UTC)
felipe

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Thanks for the advice, I turned the voltage to max looking to increase to 5V, be sure I never do again...
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felipe  
#102 Posted : Thursday, February 25, 2016 11:50:31 AM(UTC)
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Russ, Brian?
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Russ White  
#103 Posted : Thursday, February 25, 2016 12:44:21 PM(UTC)
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Time to test individual things. It sounds like you probably damaged a component with over-voltage.

Start by removing any source and Legato/IVY to test the DAC independently.

We are only testing supplies/regs here so don't connect anything to the DAC outputs or inputs. There should be nothing on it but Tridents and AVCC.

When you apply power (5.25V max) (limited to say 600ma) to VD record the output voltages of each trident and the AVCC
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Russ White  
#104 Posted : Thursday, February 25, 2016 1:16:12 PM(UTC)
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Also I notice you have things wired to your EXT-IO header. Make absolutely sure you have no shorts there - especially since it looks like you may have directly soldered wires to the header around pin 1,3.

A short from pins 1,2 to pins 3,4 would short circuit the output the reg that powers the micro controller and external bits.

Edited by user Thursday, February 25, 2016 1:22:29 PM(UTC)  | Reason: typo
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felipe  
#105 Posted : Thursday, February 25, 2016 1:23:22 PM(UTC)
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Russ all DIP switches to ON?
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Russ White  
#106 Posted : Thursday, February 25, 2016 1:28:38 PM(UTC)
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Does not matter in this context
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felipe  
#107 Posted : Thursday, February 25, 2016 1:30:12 PM(UTC)
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I left conneceted Sidecar & S/PDIF_4?
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Russ White  
#108 Posted : Thursday, February 25, 2016 1:30:45 PM(UTC)
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Before you do anything else disconnect the things from EXT-IO and make absolutely sure you have no short from the VDD_EXT pins and the GND pins(or any other pin for that matter)
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Russ White  
#109 Posted : Thursday, February 25, 2016 1:31:17 PM(UTC)
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Originally Posted by: felipe Go to Quoted Post
I left conneceted Sidecar & S/PDIF_4?


No - you leave nothing connected to the DAC at all.
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felipe  
#110 Posted : Thursday, February 25, 2016 1:45:10 PM(UTC)
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VD 5.2VDC max 0.426mA, lab psu dont left me give more current to BIII
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felipe  
#111 Posted : Thursday, February 25, 2016 1:49:38 PM(UTC)
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Originally Posted by: Russ White Go to Quoted Post
Before you do anything else disconnect the things from EXT-IO and make absolutely sure you have no short from the VDD_EXT pins and the GND pins(or any other pin for that matter)


No shorts pin 1 with 3-4 and 2 with 3-4
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Russ White  
#112 Posted : Thursday, February 25, 2016 1:50:55 PM(UTC)
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Do you mean 426ma? If so that's good. Check the voltage out at each trident and AVCC output.
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felipe  
#113 Posted : Thursday, February 25, 2016 2:08:06 PM(UTC)
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VDD XO 3.21
VDD 1.15
DVCC 3.21
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Russ White  
#114 Posted : Thursday, February 25, 2016 2:08:52 PM(UTC)
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And AVCC?
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felipe  
#115 Posted : Thursday, February 25, 2016 2:09:28 PM(UTC)
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AVCC 3.41 both sides
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Russ White  
#116 Posted : Thursday, February 25, 2016 2:12:58 PM(UTC)
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Perfect - it appears the DAc itself and the REGs are fine.

Now to test the other things.

Power the sidecar by itself with 5.2V - not connected to anything - note much current it needs.

Do the same for the SPDIF4 (all by itself with nothing else connected)
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Russ White  
#117 Posted : Thursday, February 25, 2016 2:16:00 PM(UTC)
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Make sure you check sidecar both with the relay switch engaged and disengaged. With the relays powered it should consume a fair bit of current.
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felipe  
#118 Posted : Thursday, February 25, 2016 2:27:53 PM(UTC)
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To engage the Sidecar I need to powering form the switch right?
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Russ White  
#119 Posted : Thursday, February 25, 2016 2:34:25 PM(UTC)
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You just need stick a short piece of wire from VD on the sidecar to B

wire VD to 5.2V and GND from your supply.
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felipe  
#120 Posted : Thursday, February 25, 2016 2:41:01 PM(UTC)
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69mA Sidecar
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