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Old 23rd February 2013, 11:21 AM   #471
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by EUVL View Post
Let's all go back to some constructive discussions.
Markus,

do you also confirm my finding that MR remain high when the amp is cycled back to the off state?

Cheers,

Nic
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Old 23rd February 2013, 11:58 AM   #472
ashaw is offline ashaw  Australia
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I think that is beyond this discussion. It has already been stated that this is by design. There is a document by EUVL that explains this design decision that will be released shortly. I think it should allay your concerns sufficiently.
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Old 24th February 2013, 07:36 PM   #473
Markus is offline Markus  Germany
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Nic,

I am sorry, I am not so far yet.
We (a group of DIYers) just started with soldering the diff amp sections and we wanted to make sure that this works correctly before we would go ahead with the comperator, logics and supply sections.
It was my pleasure doing some testing for Patrick but I shall leave it up to him to summarize the outcome of the investigations in the circuit description he already announced.

Regards
Markus
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Old 24th February 2013, 07:51 PM   #474
EUVL is offline EUVL  Europe
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The test results from Markus agreed perfectly with the Spice model that I sent Nic a week ago, with recommendations to change a few resistor values.
These resistor values were used by Markus, and his test confirmed that those are correct.
So in the next week or so, Alexis will publish a revision of the schematics plus all other details.

As already mentioned, we shall send replacement resistors to all Batch 1 subscribers in ordinary envelopes in a couple of weeks.
WK is extremely busy with work, and ordering resistors, packing and posting still takes time.


Thank you for your patience,
Patrick
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Old 24th February 2013, 09:26 PM   #475
NicMac is offline NicMac  Italy
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Thank you for the updates Markus and Patrick,

I did indeed get a spice model (that I don't know what to do with.....) and resistor values from Patrick and I understand how to address the diff amp gain/bias issue. Unfortunately, even getting the right voltage over the comparator does not trip any logic downstream.
Just like the rest of what I have found, I think this must be just another soldering flaw of mine

I have decided to give up with the protection board for the moment as this only seems to bring headaches to everybody - and me the most. I will leave to the pro's to solve the issues. For the moment my patched version works perfectly to control the power of the amp.

This weekend I have been listening carefully and trimming the bias of the amp. And THIS IS REWARDING
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Old 28th February 2013, 05:22 PM   #476
EUVL is offline EUVL  Europe
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The circuit description we promised is ready to publish.
We are waiting for Alexis to update the schematics and BoM to go with the article.
No response from him the last couple of days unfortunately, so we are in waiting mode.
Will let you know when we have them.


Patrick
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Old 1st March 2013, 12:52 PM   #477
NicMac is offline NicMac  Italy
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I think I found the right equipment rack for the XEN F5X series
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Old 1st March 2013, 01:18 PM   #478
CeeVee is offline CeeVee  Portugal
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Nice Nic.
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Old 2nd March 2013, 05:49 AM   #479
EUVL is offline EUVL  Europe
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The promised circuit description, as well as the corrected schematics and BoM, will be posted at our website latest by Monday.
WK is busy with work this weekend.

You will then get a link here to download.


Patrick
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Old 6th March 2013, 12:39 PM   #480
NicMac is offline NicMac  Italy
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I think this rack will work out just fine
Now I just need the F5Xpre and 9018/SEN in matched chassis
My first (proudly) made in China set-up

No I just need to redecorate my living room where this setup will relocate once complete

Cheers,

Nic
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