Twisted Pear Audio Support
»
Product Support
»
Digital
»
Buffalo DAC
»
Replacing Buffalo II onboard s/pdif switch with "external" switch
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
hello folks
are there any problems in replacing the onboard s/pdif switch with a panel mounted one?
will I run into any noise issues?
best
Leif
Norway
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
It will probably work fine, but its not really ideal from a routing perspective.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
ok thxs thought so will switch between feed from s/pdif and I2S module and find it impractical to switch on the pcb itself inside an enclosure best Leif Edited by user Wednesday, April 27, 2011 8:34:22 AM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 2/10/2009(UTC)
Posts: 299
Location: Italy
|
Russ,
what does the switch actually connect? The TTL level S/PDIF between the comparator and the DAC chip?
I have poked around with a DMM but my probe is wider than the legs of the DAC chip and I have not come up with a conclusive answer.
It's not connecting input S/PDIF to the comparator and it not on the supply line for the comparator.
Cheers,
Nic
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
christensenleif@msn.com wrote:ok thxs
thought so
will switch between feed from s/pdif and I2S module and find it impractical to switch on the pcb itself inside an enclosure
best
Leif (without having access to the schematics, I would say) leave the switch off, tap the boosted spdif signal at the input of the switch route to your external switch
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
NicMac wrote:Russ,
what does the switch actually connect? The TTL level S/PDIF between the comparator and the DAC chip?
I have poked around with a DMM but my probe is wider than the legs of the DAC chip and I have not come up with a conclusive answer.
It's not connecting input S/PDIF to the comparator and it not on the supply line for the comparator.
Cheers,
Nic I believe is the output of the comparator to D1 (feeding the boosted spdif signal to D1, which is shared with I2S)
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
ok
thxs glt
will try
best
Leif
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
hello R&B :d/
when I measure at the s/pdif switch it seems as if the on posistion just connect the 2 traces on each end of the switch as seen from the top of the pcb?
if this is correct, I might as well leave the pcb switch in "open" and solder another panel mount switch to the above mentioned traces on each end of the pcb-switch.
in "ON", it will engage s/pdif; in "OFF" it will engage I2S
then I can still have the MUX with 2 s/pdif inputs and select externally between I2S and the 2 MUX s/pdif´s.
Have I gotten it right?
best
Leif
Norway
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 2/10/2009(UTC)
Posts: 299
Location: Italy
|
No - I don't think so. When using S/PDIF I don't think you can have a I2S source connected. I think you will need to have a switch disconnecting the I2S when using S/PDIF. Cheers, Nic Edited by user Thursday, May 5, 2011 1:10:48 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
ok thxs for answer, but why can´t those who knows just barf up the solution/answer? can it be solved this way or not? best Leif Norway Edited by user Thursday, May 5, 2011 9:45:24 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
The firmware in Buffalo sets for auto spdif detection. In such configuration, no other signal can be applied to the pins. Thus in theory, you must removed all other signals when using spdif (as the input pins are shared). It may be possible to leave the pins connected to i2s if you can turn off the i2s signals
There is however a manual mode (requiring that you use your own code) where you select the input pin and the input mode. In this case it it may be possible to leave the pins connected to live I2S signals while just switching one pin to spdif.
(I can try the send scenario when I get a chance and report back)
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 2/10/2009(UTC)
Posts: 299
Location: Italy
|
glt wrote: In this case it it may be possible to leave the pins connected to live I2S signals while just switching one pin to spdif.
(I can try the send scenario when I get a chance and report back) I look forward to hear what you find! This might be the final drop to make me go down the arduino way..... Cheers, Nic
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
You never want to have two signal connected to a single pin ever, because one will contend with the other or even short it out (or load it badly) when its not interfering with it. If you want to multiplex signal you need to use relays or a real multiplexer.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/21/2008(UTC)
Posts: 314
Location: Norway
|
ok
but the Mux I already have installed, only handles s/pdif in and s/pdif or I2S out
I´d like to be able to switch between I2S and s/pdif in on the dac board from the outside of the chassis
how do I solve this?
the forth coming audio controller reminds me of Jesus; everybody has heard about him and nobody´s seen him he-he
best
Leif
Norway
|
|
|
|
|
|
Twisted Pear Audio Support
»
Product Support
»
Digital
»
Buffalo DAC
»
Replacing Buffalo II onboard s/pdif switch with "external" switch
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
