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Russ White wrote: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. :) hello R can you explain pls? I have 3 exaboards and all behave the same they work against BII, no problem is there any way I may have ruined the BIII boards when I tried dual mono, that make them not work on I2S input and still function on s/pdif inputs? best Leif
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My guess is that it is something very simple that you are overlooking.
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You´re probably right and it drives me mad! he-he anyway; fixed the s/pdif pcb issues HURRAH! it´s really frustrating, because as you know I´ve built quite a few of your dac´s as well as lots of other stuff, and I´ve never hit the wall like this before I´ll have a coffee and a Cognac X/O to clear my mind!  best Leif
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The X/O helped!.....you know what?
it wasn´t a faulty layout, gnd or anything
it´s got to be the F%#"/&! ribbon cables!
even despite that I tested several of them!
I soldered in the pcm jumpers and soldered the cables from the Exa and straight in under the board
now I´ve got a rock solid signal lock!
nothing wrong with Exa, gnd or anything!
will solder BIII, sidecar and s/pdif pcb together, no question about it
have a nice easter
I will
best
Leif
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Very likely the IDC connectors were not making good contact. Glad you have it sorted.
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hello folks not quite home free yet; last night I soldered the 3 I2S leads directly on to the BIII and it was rock solid today I soldered the sidecar piggybacked straight onto the pins on the BIII header and connected the Exa back to the sidecar and voila, same problem cleaned and resoldered whole sidecar and still same works perfect with p/sdif passing through soldered one by one of the I2S cables back onto the board and soldered off again regardless of order as long as one of the I2S cables passes through sidecar I get unstable lock is the sidecar sensitive to screening? best Leif Edited by user Sunday, April 1, 2012 7:46:56 AM(UTC)
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christensenleif@msn.com wrote:hello folks
not quite home free yet;
last night I soldered the 3 I2S leads directly on to the BIII and it was rock solid
today I soldered the sidecar piggybacked straight onto the pins on the BIII header and connected the Exa back to the sidecar and voila, same problem
cleaned and resoldered whole sidecar and still same
works perfect with p/sdif passing through
soldered one by one of the I2S cables back onto the board and soldered off again
regardless of order as long as one of the I2S cables passes through sidecar I get unstable lock
is the sidecar sensitive to screening?
best
Leif Does it still lock when nothing is playing but loose lock when you start playback? Could this have something to do with using 4th pos led from the front panel select to switch the sidecar (is your power supply set up to supply enough current)? Edited by user Sunday, April 1, 2012 11:23:44 AM(UTC)
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yes one lead from led to b on sidecar I wonder too will check later I have 2 dacs and they´re basically the same with same problem ..... they have different psu´s; one have linear for BIII pcb and "old" Placid for L3 and the other have Placid HD i bothe positions what´s weird is that 2 different dac´c based on BIII and Legato 3 with sidecar and s/pdif pcb and selector wired to vacant input 4 behaves identically there must be something I missed I don´t believe in coincidences..... best Leif Edited by user Sunday, April 1, 2012 2:12:51 PM(UTC)
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yet another observation:
fed the sidecar with 2,5vdc from a vacant half of dual linear supply
unstable lock in pos 4 and 2 and stable in 1 and 3
of course when the relays are activated the I2S is selected anyway, but why any difference
is the switch wrongly mounted?
it sits on the side with the profile drawing
best
Leif
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christensenleif@msn.com wrote:yes one lead from led to b on sidecar
I wonder too
will check later
I have 2 dacs and they´re basically the same with same problem .....
they have different psu´s; one have linear for BIII pcb and "old" Placid for L3 and the other have Placid HD i bothe positions
what´s weird is that 2 different dac´c based on BIII and Legato 3 with sidecar and s/pdif pcb and selector wired to vacant input 4 behaves identically
there must be something I missed
I don´t believe in coincidences.....
best
Leif What happens if you switch the sidecar normally (external 5VDC to the trigger header)? And what are the led`s voltage? 3.3 from the B3`s digital/control supply? Perhaps its too much for the B3`s supply (each relay draws aprox 21mA @5V)? Would supplying the sidecar and Sp-dif input card directly from the powersupply lighten the load on the B3`s digital control supply so that it can still power the trigger through the front panels 4th led? Hmmm, sorry for not giving you any answers, I may be throwing the wrong ideas around. Good luck. I realy hope you figure this out. I am not as experienced as you so the fact that you have this problem does not bode well for my nearly identical build yet to be started. Two friends of mine gave up (same build) but I am not sure if they tried external supply to the relay`s.
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hello again
came to think of something;
since the dac is built on a plywood breadboard with just alu backplate, do I need to have a separate gnd wire on the switch assembly?
since the switch unit seems to introduce the problem and not the Sidecar itself
I´ll go down and test right away, even before I walk the dog!
best
Leif
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the switch pcb is already grounded through the umbilical tried again to feed the sidecar by vacant half of linear supply now up to 3,5vdc of course triggers relays and I2S engages no s/pdif module hooked up since it works fine in all combos works nice w/o imput selector switch module on I2S feeding sidecar BUT when plugging in switch its unstable on input 2 and 4, an dead stable on 1 and 3 if I have it on e.g. 4 it´s unstable, but if I unplug connection to BIII by unplugging switch umbilical it locks immedeately to be certain of conclusion I went down and repeated the whole test on the other dac and result is identical no problems until selector switch is hooked up with either input 2 or 4 in, input 1 and 3:no problem just to repeat on sw block 1&2 all are in off and yes I have tested ALL DLL combos! what do you think? may the fw chip have something to do with this? best Leif Edited by user Monday, April 2, 2012 2:56:08 AM(UTC)
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I take it that you mean using the front panel led connectors "1 or 3" or "2 or 4" to switch the sidecar? Stable lock from exxa when using 1 or 3 and unstable when using 2 or 4? Have you seen any drop in voltages to and from the front panel switch when using pos 2 or 4? I do not know what effect the firmware chip has on input mapping, but proborably best to keep it in. Edited by user Monday, April 2, 2012 5:02:50 AM(UTC)
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Yes exactly
will check those voltages
just received Teleporter pair and Trident 3 for BIII
best
Leif
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ok guys it´s the firmware chip
once I pull it out, the lock is dead stable both on s/pdif and the I2S from Exa U21
the downside is that I get s/pdif input 1 on all s/pdif inputs
could you pls fix some new fw?
I don´t know if they´re fried, or you just need changing/rewriting them?
best
Leif
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christensenleif@msn.com wrote:ok guys it´s the firmware chip
once I pull it out, the lock is dead stable both on s/pdif and the I2S from Exa U21
the downside is that I get s/pdif input 1 on all s/pdif inputs
could you pls fix some new fw?
I don´t know if they´re fried, or you just need changing/rewriting them?
best
Leif Are you sure it is not just that without the firmware chip the dac draw`s less power (half of the dac is disabled) and thereby there is no voltage drop when you use the B3`s power to switch the relay`s? Edit: when you remove the chip, there will be less load on the B3`s onboard control supply. I am wondering if it is possible to supply the front panel switch from a 3.3V LCDPS (instead of from the B3`s EXT_IO pin2) and the sidecar and sp-dif module from the other half running at 5V (or keep sidecar and sp-dif running from VD through B3`s pcb)? Edited by user Monday, April 2, 2012 9:58:07 AM(UTC)
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hello with the fw chip in the Placid HD is adjusted for 600mv current it delivers 25vdc to BIII when paying through Exa the shunt is approx 60mv when playing s/pdif the shunt is 110mvvdc is rock stable and doesn´t sag at all! same figures w/o fw chip 25vdc 62mv114mv might be just drifting so I definitely need some firmware that delivers the lot; exa and 4x s/pdif selection through selector switch best Leif Edited by user Monday, April 2, 2012 11:01:35 AM(UTC)
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christensenleif@msn.com wrote:hello
with the fw chip in the Placid HD is adjusted for 600mv current
it delivers 25vdc to BIII
when paying through Exa the shunt is approx 60mv
when playing s/pdif the shunt is 110mvvdc is rock stable and doesn´t sag at all!
same figures w/o fw chip
25vdc
62mv114mv
might be just drifting
so I definitely need some firmware that delivers the lot;
exa and 4x s/pdif selection through selector switch
best
Leif 25VDC or 5,25VDC? (!?) And have you measured the voltage at the sidecar trigger terminal when switch is set to 4 and there is a signal from the exxa? Edited by user Monday, April 2, 2012 11:06:20 AM(UTC)
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Leif, what you are describing means is that you may need to set wider DPLL bandwidth - or simply leave with all of the DPLL switches off (open) so that you use the default setting.
You also do need to make sure you are checking the shunt current while the music is playing.
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5.25 vdc to BIII
absolutely all switches are in OFF position
the 9v-9v 15va x-former and Pacid HD delivers what it shall even when playing
all the voltages and shunt values were measured while playing in my workshop
will test more tomorrow, but now I need some rest
best
Leif
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