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Old 6th August 2013, 04:52 AM   #1051
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I have made the second option - moding the board to 3.3 v I2s . Just to check today Dc Refference module I believe that there are some trimming that might help this noise , it is on the background of the music not that notable when playing music but it increases when music stops

it seems that it might be a grounding loops ...
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Last edited by Krokotam_; 6th August 2013 at 05:05 AM.
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Old 6th August 2013, 05:05 AM   #1052
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Quote:
Originally Posted by Krokotam_ View Post
Thank you for your support Oliver , based on your last suggestions i have made this project up and running * a BIG thanks from me ! Well everything fine but not at all There is a strange noise in both channels *it increases when there is no sound, i guess something to be done with the output [I`m going tomorrow to move those knobs - pots ] Should i shorter the I2S cable length ? Again thank you for your time you have some nice beers from me if you plan a holiday near Black Sea
Hmm... Did you change the input voltage to 3.3V?

You should do also the 2nd recommended modification! The free running DEM oscillator soundīs better

If you havenīt a SMD cap, use a small film cap on the backside of the Red Baron.

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Last edited by dvb projekt; 6th August 2013 at 05:09 AM.
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Old 6th August 2013, 05:34 AM   #1053
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I think i`ve got it Voltage on the clock ! is dropping maybe my 3.3 CZ 100 mA voltage regulator is not enough for here ...
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Old 6th August 2013, 08:07 AM   #1054
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Probably way off-topic but has anyone else tried a TDA1541 chip (NOT the 1541A) in one of Oliver's PCBs?

I have one that has sat in a drawer for 30-odd years, ever since I swapped it for a 1541A in my then-current CD player in about 1986 or '87. I recently fitted it in one of Oliver's green (pre-Red Baron) PCBs - it worked straight away, no mods needed, and sounds very, very good.

I've not had a chance to do detailed comparisons with the "newer" chip but I've lived with it for a week now and am still greatly liking the sound.

Moral: if you have a 1541, dig it out and put it to work.
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Old 7th August 2013, 08:06 PM   #1055
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Sorry, I've got to ask again.

But where did you get that connector for the psu to the dac?

How many pins are you actually using ? 6 or 7?
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Old 8th August 2013, 06:03 AM   #1056
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6 pins = 1 connector 4 pins +1 connector 2 pins ( 4 pins TDA power supp 2 pins oscillator power supp )
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Old 8th August 2013, 07:05 AM   #1057
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Hmm i have not edit option for my previous post ...
I have made the first modification for this DAC clock , but you have suggested to do the DEM clock , hmm . There are a few things i don`t understand .
Should i keep the first modification diodes and changes to do the second ? Or in main what is going on with the 3.3 K resistor , 100 R resistors ,68 R they where changed with diodes and bridge ? Should i keep them or just leave their place blank ?

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Old 8th August 2013, 07:58 AM   #1058
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Quote:
Originally Posted by Krokotam_ View Post
Hmm i have not edit option for my previous post ...
I have made the first modification for this DAC clock , but you have suggested to do the DEM clock , hmm . There are a few things i don`t understand .
Should i keep the first modification diodes and changes to do the second ? Or in main what is going on with the 3.3 K resistor , 100 R resistors ,68 R they where changed with diodes and bridge ? Should i keep them or just leave their place blank ?

Click the image to open in full size.
image hosting more than 5mb
The modifications are independend from each other.

Look in the attached pdf from the Red Baron V5.0. Itīs easier to understand

Attached Files
File Type: pdf Red Baron V5.0.pdf (34.9 KB, 52 views)
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Old 8th August 2013, 12:17 PM   #1059
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Sorry for flooding your thread
But i have done your last suggestion :http://img24.imageshack.us/img24/107...unningdemo.jpg : free Dem oscillator mod , aaand there is no sound again . Based on the 2 previous modifications i have put a bridge on 100R resistors , 2 diodes on 3k3 resistors , replaced 1k resistors with diode strings 3k3 , replaced 2k2 with 6k8 , removed 12k , removed signal diodes and 74HC02 . No sound at the output maybe i have done some mistakes can you correct me please ? Are you sure that this DEM clock is compatible with analogmetric I2S ?
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Old 8th August 2013, 01:16 PM   #1060
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Please ignore my last post . Grounds - very important for RUNNING THIS CLOCK . Everyone who is going to use it connect your I2S device ground to DAC GROUND , otherwise you bang your head and thing what is wrong ... I also recommend this DEM clock : First Impressions : Sound is very relaxed mids are clear and highs are a bit mild . Congratulations Oliver very well done !

Cheers
Ivan
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