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.
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.
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.
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.
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.
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.
For this http://www.diyaudio.com/forums/showthread.php?postid=344186#post344186
solution alone does not solve the problem. There is still a click changing between 01111111 and 10000000. The mute during switching works better.
solution alone does not solve the problem. There is still a click changing between 01111111 and 10000000. The mute during switching works better.
Till,
Thanks for the report.
For the pb at position 01111111 to 10000000.
could it work with
Mute
Then put all to 1: 11111111
wait 10milli second
then open the relay's last 7 bits to: 10000000
release mute
it is be called Make before Break...
It will work one way, but must be done differently for the other way...
Regards.
Alain.
Thanks for the report.
For the pb at position 01111111 to 10000000.
could it work with
Mute
Then put all to 1: 11111111
wait 10milli second
then open the relay's last 7 bits to: 10000000
release mute
it is be called Make before Break...
It will work one way, but must be done differently for the other way...
Regards.
Alain.
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
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
moe29,
A 10K stereo 23 positions for inputs.
For a 5 K go to:
http://homepages.tcp.co.uk/~nroberts/atten.html
You just have to set the value of the pot, the number of pos...
Regards.
Alain.
A 10K stereo 23 positions for inputs.
For a 5 K go to:
http://homepages.tcp.co.uk/~nroberts/atten.html
You just have to set the value of the pot, the number of pos...
Regards.
Alain.
Adams_Leo,
Take a look at:
http://www.diyaudio.com/forums/showthread.php?s=&postid=383590&highlight=#post383590
Starting at post#4
For the attenuator, APOX Kit they are not produced anymore...
http://www.apoxcontrols.com/apoxVolumeBoards.htm
Final buid:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=41466&highlight=
Best regards,
Alain.
Take a look at:
http://www.diyaudio.com/forums/showthread.php?s=&postid=383590&highlight=#post383590
Starting at post#4
For the attenuator, APOX Kit they are not produced anymore...
http://www.apoxcontrols.com/apoxVolumeBoards.htm
Final buid:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=41466&highlight=
Best regards,
Alain.
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