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Old 7th April 2013, 08:18 AM   #81
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Great stuff, Patrick

I hope the TCS comes up to expectations - looking forward to the results, and appreciate all the effort that you've put into this particular project that we're all benefitting from.

Thank you very much indeed.
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Old 7th April 2013, 10:01 AM   #82
EUVL is offline EUVL  Europe
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I made a small layout mistake with the TCS board, so we need new ones made.
I am waiting for that right now, but it wil take a few weeks at least.
So patience.


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Old 7th April 2013, 10:08 AM   #83
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I'm waiting for Jan's no 5 publication to arrive and have hopes that the Tone Control project will be compatible with your new design and the Xfeed ccts.

All good things take time ....
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Old 24th May 2013, 09:39 AM   #84
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Fresh from my work bench, the revised TCS daughter board.


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File Type: jpg 130524 DAO TCS3 Proto 1s.JPG (146.7 KB, 511 views)
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Old 24th May 2013, 09:47 AM   #85
EUVL is offline EUVL  Europe
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A custom made transformer from Toroidy for the DAO.

There are 4 secondaries (+/-Vs for 2 channels).
2 of them were wound between from o'clock, via 12 o'clock to 3 o'clock.
The other 2 from 3 o'clock, via 6 o'clock to 9 o'clock.
There is also a electrostatic shield between primary and secondary.
This is an attempt to minimise cross talk between two channels.
But the Tx was rather expensive.


Patrick
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File Type: jpg 130524 DAO Tx s.JPG (276.0 KB, 504 views)
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Old 27th May 2013, 12:01 PM   #86
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Looking good, Patrick!
Watching with interest.
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Old 3rd June 2013, 08:00 PM   #87
NicMac is offline NicMac  Italy
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Patrick,

I know you have not finished the build description of this beauty yet, but as I have plenty of 2SK2013, and a fellow admirer of the DAO has plenty LU1014D, we would very much appreciate your opinion on the optimal type and values of matching to aim for with this build.

Any comments would be greatly appreciated

Nic
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Old 5th June 2013, 04:17 AM   #88
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All the modules are working. I am just waiting for mechanical some parts before final integration.

For devices, I don't aim for a specific value of 2SK2013, as long as they are matched to each other at bias.
As long as you take close-to-average Vgs values (from a large batch), you should be fine.
LU1014D is more complex, as we curve trace in the real triode-cell circuit.

Suggest you build up a triode cell and do some measurements first.
If you can repeat the triode curves as in the publications, you are on track.

ALL but 50 of our own LU1014Ds were pre-matched for Vgs.
So we are only dealing with minute differences.
If you have random devices, you might need to change the cascode voltage and/or degeneration individually to get the right responses.
And then things becomes very complicated.

No short cut I am afraid.


Patrick
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Old 5th June 2013, 10:04 AM   #89
NicMac is offline NicMac  Italy
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Thanks for your kind clarifications Patrick,

>For devices, I don't aim for a specific value of 2SK2013, as long as they are matched to each other at bias.

For what bias did you settle?

> LU1014D is more complex, as we curve trace in the real triode-cell circuit.
Suggest you build up a triode cell and do some measurements first.
If you can repeat the triode curves as in the publications, you are on track.

Ok - I guess I will have to study and see if I can find out how to build and use such triode cell.
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Old 5th June 2013, 10:25 AM   #90
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200mA.
Read the articles.


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