I am hooking up the Volumite to my dual mono Opus. I have sound, but no volume control. Everything is at max volume. I've looked through the other posts with the same issues, but I don't see a real definitive answer. My connections are as follows:

VCC > VD on one of the Opus boards
GND > G (at the power connection on the same Opus board)
SDA > SDIN on both Opus boards
SCL > SCK on both Opus boards

Switches are set:
DIFFHW=0
Mode=open
I2S = Right = 1, Left =2
All other switches are open.

I'm not sure if the I2S switch setting is correct - I saw this on an older HeadFi posting - but I've tried settings at 1, open and 0 with no difference.

The Opus is fed by a USB module and outputs through an IVY. I should say that I love the sound of the Opus (even at max volume). But I am stumped on how to get the Volumite to work right. Any guidance would be greatly appreciatet.

I copied this from another thread:

Here is some info from the WM8741 datasheet (page 5):

I2S: in 2-wire s/w mode (using volumite), this sets the address of the device. I would assume setting it low gives one address and setting it high gives the other address

DIFFHW: 0= normal; 1= MONO

With DIFFHW=0, then MODE=Z for 2-wire control (volumite)

OSR is unused
IWO is an output, so set to Z

DSD and DEEMPH must be set to Z because these become the control wires to the volumite in s/w mode

MUTE: 0= Mute active; 1= Normal operation (you can try setting MUTE to 1)

FSEL: Unused.

So in summary:

I2S: try 0 or 1
DSD: Z
DEEPH: Z
MODE: Z (stereo)
IWO: Z
DIFFHW: 0 (stereo mode)
FSEL: Z (unused)
MUTE: try 1
OSR: Z (unused)

So the only switches to try are I2S and MUTE

The I2S switch sets the address: One OPUS must be set to 0 and the other to 1


*****

The jumpers in volumite:

PIN1 PIN3 OSR (Input sample rate)
---- ---- ---
LOW LOW HIGH --- 192K
LOW HIGH LOW --- 44K
HIGH LOW MED --- 96K
HIGH HIGH LOW --- 44K


*****

Tha above info from data sheet is for stereo.

For MONO:

DIFFHW=1
MODE=0 for left channel, =1 for right channel

Edited by user Wednesday, March 02, 2011 10:38:16 AM(UTC)  | Reason: Not specified

For dual mono is

DIFFHW=1

MODE=0 for left channel
MODE=1 for right channel

I2S=0 in one of the OPUS
I2S=1 in the other OPUS

(I would assume it wouldn't matter which one has which address)

Read p5 and p6 of the data sheet:

Pin6: DiFFHW: 0=normal; 1=differential mono
Pin24: MODE: When DiffHW=0: 0=h/w mode; 1: 3-wire s/w; z: 2-wire s/w -which is I2C mdoe
Wnen DIFFHW=1: 0=left channel; 1=right channel

Once you put DIFFHW=1 I suppose it will assume s/w mode and the protocol has to be 2-wire. You then set the address with the I2S switch

DIFFHW=0 and MODE=Z is for stereo mode. I thought your are using dual mono...

Edited by user Wednesday, March 02, 2011 3:02:55 PM(UTC)  | Reason: Not specified

OK. That did not work.

I2S 1=right, 0=left
Diffhw=1
Mode 1=right, 0=left

All other switches open.

All I got was a very loud buzz.

Yes you cannot use DIFFHW(as its name implies it applies to hardware mode) in software mono mode. The firmware sets up the DAC registers for mono mode.

It starting to sound like there may be other issues. Can you post a picture or two?

Any thoughts? (yes, I am the impatient type)

Yes. It works great in hardware mode. Even in software mode I am getting music, but no control over the volume.

:edit:
For tea, I really enjoy shortbread.
:/edit:

Also the correct switch settings are all switches open but I2S(which should be + or - depending on the channel)

Cheers!
Russ

Edited by user Sunday, March 06, 2011 7:27:52 AM(UTC)  | Reason: Not specified

p.s. I tried moving all switches to open (including DIFFHW), except I2S and there is no change. I still have sound, but no control from the volumite.