Zen V4 and A75 listening with CCS-X-BOSOZ

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#21
Francois,

I am currently doing tests with the unbalanced outputs of the CCS-X-BOSOZ
connected to the A75, and there is so few differences driving the A75 balanced or not. I will persue these tests with the records we listened yesterday, to hear if there is any difference. Perhaps a little more background noise...

I joined kuo kyc about the wishay dale 10K stepped attenuator I use at the outputs, he told me about a lubricating excess, and to "repeatedly rotate the switch"

Well I did 50 complete rotations, thats 50 one way and 50 reverse,
and the noise diminished a lot, I will test 100 more complete
rotations... will see after that. He offered to replace with an other one
or send the money back to me ; if it doesn't work properly...

Best regards.

Alain.
 
#22
Till, and Grey

I have done some little math, old logic... 1/*2/*4/*8/*16/*32/*64/*128 etc

For 64 steps: if I use 6 relays with the following resistors

100 Ohms
200 Ohms
400 Ohms
800 Ohms
1600 Ohms
3200 Ohms

That gives me
0;100;200;300;400;500;600;700;800;900;1000;1100;1200;1300;
....................
etc until
5900;6000;6100;6200;6300 End
all steps with 100 Ohms increment

Thats a variation from 0 to 6300 Ohms or 6.3 K

Is it usable for the purpose of the CCS-X-BOSOZ or is there an other type of progression to use... ?

Alain.
 
#23
i did not find any better than doubeling each bit.

For my 8 Bit i use 62/120/240/510/1000/2000/3900/8200 Ohm

I made before a 6 Bit with ADC 0804 control and ended adding a 7th with a separate switch. That one was like the lower 6 of the above i hope to remember.

I think what your values are ok.
 
#26
The make before break (without muting inbetween) and things like switch only a few bits, wait, switch the others etc. was not sufficient.

The mute inbetween makes a make before break unneccessary, it would only make the time for one state change longer. Check my site
http://home.tu-clausthal.de/~tpa/relais/index.html at software http://home.tu-clausthal.de/~tpa/relais/software.html you see some different versions, some with mute during switching. Its very easy to modify and experiment with the existing code, an assembler is for free at Mircochip and a programmer could be made for 5€. The mute during switching needs a mute relays like on this board: http://home.tu-clausthal.de/~tpa/relais/inputboard.gif
 
#27
Some pictures of the: CCS-X-BOSOZ
 

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