Yes, actually you may be onto something. Those resistors should be lower. Even down to 1K would be just fine. If you have a couple 1K resistors you could put them in there.

:edit: 10K *may* work ok but the rise time could also be too slow. I indicate 2.21K in the schematic which is a good value as it should work well for both 3.3V and 5V applications.
It is a fairly easy thing to change, so at least worth a go.
:/edit:

Edited by user Sunday, March 6, 2011 5:50:18 PM(UTC)  | Reason: Not specified

If the volumite is for dual mono shouldn't using one OPUS (programmed for mono left or mono right) hooked up for stereo give you two left channel or two right channel? (See p48 of data sheet)

If it is playing Stereo, it could mean that the uP is not doing anything and the registers are coming up in default mode.

Hmm... I guess what I really need is a magic bullet, then ;-)

Is it worth replacing the controller?

OK. I don't have the ability to try and reprogram it, so I'll order a new one.

Brian,

Thanks for the quick shipment. I received the new controller today and installed it. I hate to report that I still have the same issue. Sound coming out, but no control over the volume.

I have double checked the jumpers on Opus - all open except for I2S which are set at 1 on the right dac and 0 on the left.

I confirmed that the pot on Volumite is functioning correctly. I am getting varying voltages delivered to pin 3 (PB4) on the controller.

Confirmed the connections of SDA>SDIN on both dacs and SCL>SCK on both dacs. I have not connected PB1 or PB3.


I'm stumped.

OK. Hooked up a 220 resistor and a red led to Vout of the regulator. Connected it to SCL and the light stays on steadily, even when I move the pot. I hooked it to SCA and the led blinks steadily, no change when I move the pot

Can we get a picture of the bottom of your Volumite?

Here's a picture of the back

So, I got pretty frustrated and gave up on this last spring and set it aside. Recently, I decided to have another go at it since I really like the idea of managing volume within the dac and removing my passive volume control from the system. I went ahead and ordered a completely new volumite since I had kind of trashed the previous one soldering and de-soldering resistors. Assembled it, hooked it up and... same issue. The volumite is not controlling the volume. Sound is coming from the dac, but no control. I disassembled the dac completely and hooked only the left mono channel and the volumite did work. Then I added the right channel board and the volumite no longer worked. Now I can't recreate my success with the single mono board anymore either.

Anyway, to recap my setup:

I'm using a dual mono opus fed from a usb module. The opus boards are powered by a LCDPS. Output is through an IVY powered by a Placid BP. My switches are set:
I2S = 0-left, 1 right
DIFFHW = 0 (I've also tried Z)
All other switches = Z

For the volumite, I've wired
VCC > VD on one opus board
G > G on one opus board
SCA > SCL paralleled to both opus boards
SDA > SDIN paralleled to both opus boards

I've left PB1 and PB3 open since I'm feeding from the usb module which is only 16/48 (most of my music is ripped cd's, anyway)

The dac works great in hardware mode (though I am getting a background hiss when OSR is set to low - 0, but that is for a seperate thread).

So, I am looking for any other suggestions to try and get this to work.

Thanks Russ. I'm a little stumped, then. With the volumite disconnected I am getting a reading of 10M ohm across the DSD/SCL switch to both DVDD and G on both boards. I interpreted this as being open. With the volumite connected, I am getting a short to DVDD across the DSD switch (only one board connected at the moment). I'm not seeing anything on any of the boards that looks like a short or solder tracks, so I'm not sure where else to look.

Peter