I'm still looking for some higher frequencies clocks for my AB1.1 with ES9023 (usual problem: with ESS DACs the higher the clock freq. the better the audio performance...).The Vanguards are not bad but the Crystek oscillators http://www.crystek.com/crystal/spec-sheets/clock/CCHD-957.pdf are 25 dB better at 1 KHz:
Vanguard: Phace noise: -125dBc/1KHz
Crystek CCH -148 dB @ 1 KHz
I'm still looking for some higher frequencies clocks for my AB1.1 with ES9023 (usual problem: with ESS DACs the higher the clock freq. the better the audio performance...).
Could those 45/49 MHz Crystek oscillator be suitable for that purpose? Which kind of modification would be required to AB-1.1 to use them?
HiRes photos of AB-1.2 for download"
https://dl.dropbox.com/u/25211990/QNKTC/AB-1.2/HiRes/AB-1.2.zip
Not working on windows can anyone help...things i did
downloaded the drivers
installed the drivers
installed ASIO on foobar
checked the output as ASIO in foobar
when running an song i get following error
Unrecoverable playback error: Sample rate of 44100 Hz not supported by this device
any idea?
removed the drivers then installed the softwarae again and then now i can not see any output where i can select this as output in foobar or anywhere...
the test audio is getting the sound as headphone in green i guess 24/94 bits only....when its red i am not getting anything...
V
Start from here:
[IMGDEAD]https://dl.dropbox.com/u/25211990/QNKTC/AB-1.2/software/audio-widget-windows.png[/IMGDEAD]
sounds easy!If you look at the analog board schematic you'll see that R8 is installed for 2:1 MCLK division. It is possible to remove it and install R11 instead for 4:1 division. That way you can use the 4xMHz frequencies and still provide the 11.2896/12.288MHz required by the MCU.
sounds easy!
What about those Crystek oscillators?
Crystek Corporation CCHD-957 Standard Clock Oscillators | Mouser
Crystals and Oscillators | Oscillators | DigiKey
are they mechanically and electrically compatible with the ones installed on AB-1.x?
That is, is it enough to simply replace the clocks and R8 with R11 ?
Are there any possible side-effect?
I actually tried to work out how to fit a CCHD957 onto the existing AB1.12/13 board layouts a few days ago, just looking by eye at photos of the pcb layouts I think they end up fouling some of the bypass caps and surrounding components potentially? Though I think the pad placement for the golledge parts lines up ok with the CCHD957 pads.
Borge would be the best for that. Changing surface mount oscillators looks to be quite difficult in general without some very special tools. You could add some short wires and float the oscillators above the board. Attach a bypass cap beneath them incase the internal bypass is not enough. The isolation from floating them may help since crystals are sensitive to vibration.
That, or you can dead-bug prototype them. Glue or tape them upside-down onto some free boards area and patch the wires onto the SMD pads of the Golledge XOs. Works with both SMD and pinned components. Just check if the case should be GND or float. And remember to put decoupling right onto the dead bug itself. Wires should be insulated and pushed tight to board/XO so that they don't create a loop antenna.
The tricky part will be to get the Golledge XOs off, yes. You can do it destructively by drenching the whole XO in solder. The method I use is a tweezer-iron with wide paddles which each cover two pads.
Børge
Borge,
can you help in my problem as i showed earlier the problem is still there...
V
Have you changed the settings about which I and alexlee188 wrote before?
On your screenshot I see something completely different ...
(Read post number #1713)
You must choose the same parameters and save them...
Later, you must reset the AB 1.2 (on backpanel)
Your computer supposed to show only this: [IMGDEAD]https://dl.dropbox.com/u/25211990/QNKTC/AB-1.2/software/UAC2AudioDrivers.png[/IMGDEAD]
In Foobar2000
/Library/Configure/Output/ASIO "USE 64-bit ASIO drivers" must be OFF