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WaveI/O likes to see her current maintained at around .460mA., otherwise she might and could lock and unlock if she shows fluctuations. 
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Hi Regis,
It is not WaveIO that causes the unlocks. Connecting WaveIO directly to the DAC plays perfectly . There must be something I'm overlooking when simultaniously connecting multiple SPDIF sources and I2S at the same time.
Thanks for reacting,
kind regards,Henri
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You need the voltage divider on both Toslink inputs(this makes it consumer level), and you need the 75R (not 10K) termination at the SPDIF4 inputs. Edited by user Sunday, April 15, 2012 1:51:59 PM(UTC)
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Hi Russ,
Mounted the dividers already on 2 Toslink modules but forgot to change the 10k resistors.
I'll change them tomorrow.
btw:I'm going to mount bigger heathsinks on placid HD. They are far too warm for my liking.
Thanks again for your advice.
kind regards,
Henri
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Hello Russ,
Changing 10k resistors on 4*Toslink board. Must be 75 Ohm, but have only 50 Ohm. Is this also ok?
grts,
Henri
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75 is better, but 50 should still work.
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Hi Russ,
A happy guy is posting here. After replacing only ONE of the 10k resistors with 75 Ohm, all seems to be ok now.
I connected Toslink1, Toslink2 and USB/SPDIF simultaneously and all are playing well without dropouts.
I'll also change the other resistor of Toslink 2 and look if all goes well.
I will report on it.
Many thanks Russ for he great service.
Kind regards,
Henri
PS.: Are there Toslink receivers on the market without TTL levelshifting? It should make things a bit simpler.
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You are very welcome, I am sorry it took my so long to realize what was likely going on.
Well what it boils down to is that transmissions lines with a low impedance are far more immune to (and produce far less of) interference than transmission lines with a high impedance.
For that reason I would suggest that all single ended SPDIF signals be converted to consumer level or near consumer level via a voltage divider such as you did.
I am very glad things are straight now. :)
Enjoy the DAC.
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As a side note your experience leads me to think that the next run of TOSLINK boards I will add a spot for an optional voltage divider at the outputs.
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good all works as intended does this relate to my problem as well? I have s/pdif input 3 dedicated for your toslink module, even though I haven´t hooked it up yet, but the resistor is 10K instead of the 75R on the rest of the inputs best Leif Edited by user Wednesday, April 18, 2012 12:52:42 AM(UTC)
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Hi Henri, Today I tried again to loop the GND and '-' together on the S/PDIF Mux. All day it played with no locking issues. I came to sense that the COAX Cable wass still installed at the DAC only and the other side in a Toslink to COAX converter. When removing the cable some lock problems started again. When touching the hot pin on the other end of the COAX Cable distortion was all over. I came to the idea to shorten the Pin with the GND... Seems to work for now.... I think I will need an End Cap. Might also be a good idea for the BNC connector which I have not yet connected. Edited by user Wednesday, April 18, 2012 5:51:59 AM(UTC)
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Hello all, A happy man is posting. After replacing the 10K resistors on 4*SPDIF by 75 Ohm and mounting the voltage dividers on the Toslink output, all seems to be normal. Every source can be chosen and plays without unlocks even if all sources are active. Sound quality is exemplary. I'v never heard a more 3D soundstage before. What strikes me most is the total absence of distortion when feeding the DAC with I2S. Handel plays his Organ concertos deep in the room, Adele sets fire to the rain , Lully plays the viola da gamba on a completely black background for Louis XIV, Mozart finally keeps silent in complete awe when the BUFFALO dances. Sorry for becoming Lyrical. Thanks Russ and Brian for the never ending effort solving our problems. Thanks for giving us this wonderfull musical instrument. Kind regards, Henri Edited by user Thursday, April 19, 2012 1:23:01 AM(UTC)
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Hi Henri! altough the Buffalo may produce sound as a real instrument, it still isn't an instrument :d/  But enough laughing :P Good to hear man! Do you think it'll work for me too this way? Than I will try it tomorrow and hope all the problems are solved after that. This evening I changed the signal wiring from the Toslink Module to the S/PDIF Mux from a COAX cable to normal wires. Why should I use 75 Ohm cable if I had to install a 10 Ohm resistor?! Now again much better 3D sound and more clarity. I also think I fixed the 50 Hz humm. Tomorrow I hope to tackle the Locking Problem with the Toslink and COAX.
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henri47 wrote:Hello all,
A happy man is posting. After replacing the 10K resistors on 4*SPDIF by 75 Ohm and mounting the voltage dividers on the Toslink output, all seems to be normal. Every source can be chosen and plays without unlocks even if all sources are active. Sound quality is exemplary. I'v never heard a more 3D soundstage before. What strikes me most is the total absence of distortion when feeding the DAC with I2S. Handel plays his Organ concertos deep in the room, Adele sets fire to the rain , Lully plays the viola da gamba on a completely black background for Louis XIV, Mozart finally keeps silent in complete awe when the BUFFALO dances.
Sorry for becoming Lyric.
Thanks Russ and Brian for the never ending effort solving our problems. Thanks for giving us this wonderfull musical instrument.
Kind regards,
Henri You quite welcome Henri. You are now a fully initiated Twisted Pear kit builder. :) I fully agree with your appraisal of the music the DAC reproduces. I have always enjoyed it. I am so glad you do too. Cheers! Russ
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Hi Russ/ Brian. Is it correct like this? Only to apply on the Toslink module? Jordo attached the following image(s):  spanningsdeler 2.jpg (18kb) downloaded 53 time(s).You cannot view/download attachments. Try to login or register.
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