Okto Research modules

[dahlberg]

The board looks really nice and the build is coming along

 

[rdf]

Congrats on a very impressive review.

Review and Measurements of Okto DAC8 8Ch DAC & Amp | Audio Science Review (ASR) Forum

 

[dahlberg]

Hello.
Just making shure about i2s connections and stuff

Data 1-4, done.
mclk to Pulsar clock. Still waiting for the regulator so....
Solderpad to be shorted is jp1 ?
bclk to usb reciver, done.

That schould be it, right ?

If more gain is needed do you have a table for what resistance gives what result ?
The resitors in question have to be the 1k ones, right ?

 

[Okto Research]

Hello dahlberg,

JP1 needs to be shorted to disable the on-board oscillator and JP2 (on the back side) to connect the Sabre's MCLK pin to the pin on the main connector.

Yes, the 1k resistors are the ones. The dependence is linear, so the value can be calculated.

Pavel

 

[dahlberg]

OK, thanks.
There is a discrepancy in the manual at page 5 and 8 regarding the 15v connections. Could be confusing even though I belive that page 5 would be correct.

I figured out the i2s connections by the way.

 

[dahlberg]

Lets say that I would like twice the amount of gain on two channels ( I have
dipole subs that need some serious compensation) what would be the value of
these resistors ?
Are channel 1-2 the ones located closest to the the back of the board ?

To enter ON: I should short gpio1 to ground, right ?

 

[Okto Research]

There is a discrepancy in the manual at page 5 and 8 regarding the 15v connections. Could be confusing even though I belive that page 5 would be correct.

Thanks for pointing that out. Page 5 is correct and page 8 wrong. We're going to fix that.

Lets say that I would like twice the amount of gain on two channels ( I have dipole subs that need some serious compensation) what would be the value of these resistors ?

2k (or closest value you can get)

Are channel 1-2 the ones located closest to the the back of the board ?

Closest to the data connector.

To enter ON: I should short gpio1 to ground, right ?

Actually, newest firmware revision does that through the onboard MCU. Thus there is no need to have the jumper in place, while the signal from the MCU can be overridden. We also have to update the manual on that point.

Pavel

 

[dahlberg]

Actually, newest firmware revision does that through the onboard MCU. Thus there is no need to have the jumper in place, while the signal from the MCU can be overridden. We also have to update the manual on that point.

Pavel

So when will the "pwr" led be lit, all voltages are in place ? (no jumper yet) (clock still the onboard one)

 

[Okto Research]

Yes. All voltages nominal.

 

[dahlberg]

Well I have all of them in place but no led is on. There is +/- 12v on the opamps. I haven't measured anywhere else.

 

[dahlberg]

There is 3,3v on the gpio plint as well, on all pins except "gnd" and "gpio4".
I don't dare to measure anything else.

 

[dahlberg]

GPIO1 ON/STANDBY:
When pulled high, DAC8 enters active state if all power supplies are at nominal levels.
Maximum voltage on this pin is 3.3V, use jumper to short this pin high if not in use.

On this Picture you can see a jumper between pin1 (3.3V) and pin3 (GPIO1).
Is this what's ment with the text above ?

I'm using the possibility with the Sabre volumecontrol as descibed in the connection diagram.

 

[dahlberg]

There is music playing

 

[wcwc]

Question on stereo mode. How is the input handled? So are the spdif pins the only way to get signals into the DAC or can I2S be used in stereo mode?

 

[emailtim]

The board looks really nice and the build is coming along

Any updates on your progress ???

 

[Mooly]

Franta has made us aware of another thread. Please direct all enquiries here:

DAC8 launch and Tour announcement!

This thread is now closed.