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ok
1)can I connect both plus and minus on unused input 4 to gnd on terminal block even if I use LED4 on switch pcb to sidecar term "b" ?
2)input 3 is configured for TTL Toslink module. should I do the same there? can just let module out of equation
2) each s/pdif input have seperate gnd connection from "minus" of rca chassis connector to terminal block and they´re isolated from metal rear plate (rest of chassis is wood)
If I do like you say and short minus on both s/pdif input 1&2, 2 is muted and 1 locks to signal
if I don´t jump input 2, input 1 gets unstable/flickering sync!
I´m home in 8-9hrs
best
Leif
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It sounds like something is wonky on the board. Strange behavior anyway.
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yes I started to suspect a short or something wrong with the puls transformer
I can start by bypassing the transformers; first on s/pdif 2 and then 1
if faulty, can I replace by same as you had on the MUX?
I bought a couple of those after my changing pc-power nuked my B32!
best
Leif
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hello again
the circus continues:
did what you said and after fiddling, measuring cleaning etc both s/pdif inputs seem dead stable with unused consumer lvl input 4 both plus and minus with jumper to gnd
denon dvd1920 on one input and wav sd card player on the other
however now the exa signal is unstable and the lock led flickers
used the other BIII board and problem the same
also lifted connection to s/pdif board with no change on exa signal
now I´m fed up
will try isolating last problem by first switching sidecar pcb and then exa pcb
but problem with s/pdif pcb seems solved
thxs so far
best
Leif
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hello again
changed first sidecar, then exa and problem still same
on usb in
pulsating lock and flickering led
short ((maybe 15-30seconds)intervals with stable, then loos stability
got to be something with the configuration of gnd
best
Leif
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summed up s/pdif 1 and 2 are ok even through sidecar usb input unstable even w/o s/pdif connected to sidecar and changed: BIII Sidecar Exa ribbon cables exa fed from 3,3vdc I2C header BIII exa fed from unused secondary on BIII transformer through separate LCBPS adjusted up to 4vdc have also tried shielded cables from Placid HD to BIII and from BIII I2C header to Exa all gnd is only through ribbon cables or psu to Legato and psu to BIII all connectors isolated from metal rear plate(wood chassis) ac gnd only to rear plate and dac gnd "floats" input and output connectors have individual gnd cables and are not batched up with common return to pcb I am soon out of ideas  best Leif Edited by user Thursday, March 29, 2012 6:16:23 AM(UTC)
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Wood chassis offer no shielding at all. What is dpll set to? I think you need firmware that offer the "best" setting (safest setting; the least jitter reduction but easiest to get lock).
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Try this...
Remove the I2S ground coming from the Exa board. Connect it's power ground directly to the Buffalo's power ground at the supplies.
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hello
I´ve tried all sorts of gnd comfig involving Exa, but it doesn´t change anything
BUT
the lock is dead steady until the signal starts coming in
once stopped, steady again
and I don´t dare say what happened to the s/pdif signal once I moved the unit up to my main systen in the living room
input 2 is dependant on the gnd via s/pdif source 1 to lock
but I´ll focus on the usb signal
the s/pdif board I´ll pick apart and resolder
best
Leif
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Have you tried changing the DPLL bandwidth yet? People using the Exa with Buffalo-II was the reason we released high-bandwidth versions of the firmware. I suspect you will need to adjust it on the B-III as well.
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block 1 5,6 and 7 ON ?
best
Leif
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Or some intermediate setting
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yeah, but if it doesn´t change with widest, it´ll hardly improve with something intermediate? comment on steady lock without signal, but looses it on incoming ? often steady on startup, but looses it if I switch source and go back never gets back to good again....? and yes, have tried on different pc´s as well have one in workshop with foobar and exadriver installeed.... best Leif Edited by user Thursday, March 29, 2012 2:52:10 PM(UTC)
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christensenleif@msn.com wrote:yeah, but if it doesn´t change with widest, it´ll hardly improve with something intermediate?
comment on steady lock without signal, but looses it on incoming ?
often steady on startup, but looses it if I switch source and go back
never gets back to good again....?
and yes, have tried on different pc´s as well
have one in workshop with foobar and exadriver installeed....
best
Leif Software issue? Is your exa set up for 2ch output? Edit: I just read this at the exa site: "*Sampling frequencies 352.8 kHz and 384 kHz are possible only on ES9018 and ES9012 DACs when SCK signal is not used." Edited by user Thursday, March 29, 2012 3:31:44 PM(UTC)
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the Exa setup is the same as it always has been Yes best Leif Edited by user Thursday, March 29, 2012 9:48:54 PM(UTC)
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just tried my third! exa usb -I2S pcb and still same unstablilty into both BIIIs !
what the F%&#! ?
ideas? ANYONE?
best
Leif
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christensenleif@msn.com wrote:just tried my third! exa usb -I2S pcb and still same unstablilty into both BIIIs !
what the F%&#! ?
ideas? ANYONE?
best
Leif Do you have a metal case to put them in (even an old cd-rom drive chassis would work for testing purposes)? I do not know what the standard or least sensitive dpll setting is on the firmware from TPA (medium)? These settings are a bit confusing since the "low" is actually the goal (?), and "best" is the setting that many will have to use in our wireless world unless you shield the chip. If you look at more elaborate production dac`s they shield the chip, while simpler solutions don`t bother. Proporably to ensure that they work in all situations... Now I am not saying that the TPA firmware setting is wrong, but there seems to be an issue with high sample rate sources. Ess has made a chip that is capable of 32bit/384, but that does not mean that that will be possible in all situations. I cant say that I am looking forward to this trouble-shooting later on (I have a dual mono B3 + exxa in progress) but the more I read about it the more I am convinced that proper shielding is a good idea (also pcb chip-shields). I will try to get some shields made or make a mold to stamp them out myself unless I can find some that will fit the ess chip on the b2 and b3. Furthermore, I am sorry if I have underestimated your abilities. I am no expert, just an eager DIY`er that have fallen into quite a few pits (item not working... pulling things apart only to find that I forgot the power cable). Best regards Gunnar Edit: I do not want to hijack this thread. I do not want to offend anyone. I see now that there should not be a problem due to dpll settings when sw1:5, sw1:6 and sw1:7 are set to on. Edited by user Friday, March 30, 2012 6:50:09 PM(UTC)
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I am not sure what the problem is. Many, many people are using this combination, so there is not inherent issue.
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Since it seems to behave the same into both B3s I would start to suspect the source. There is a reason I don't endorse it. :)
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Geir:
since I left dual mono project, I have 2 complete BIII dacs, one in wood chassis with metal back plate and one in parmetal alu case.....problem the same...i´m just to avoid confusion, referrring to only one.
this is also why I have tried swapping all parts, I have duplets of all and even triplets of some parts
still same problem
all works fine in my BII ?!
I´m on my way to Sweden for a shopping frenzy, but will try higher shunt supply setting on dac psu when I get home to see if anything happens
will also turn off oversampling
I´m quite experienced DIYr too, having built loads of dac´s, TVCs, all my all out tube gear incl LCR riaa, bassamps, eq, x-overs etc, but this is the biggest challenge so far
I´ll be back!
best
Leif
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