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Old 9th December 2011, 10:46 PM   #601
smyslow is offline smyslow  Europe
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Impressive results Dave! And also impressive lab equipment.

Attached a picture from my "kitchen table" and an additional scope plot. For this I've used my UGS-based preamp as a single to differential converter to get a balanced input voltage. The cheap USB-scope with build-in waveform generator doesn't give such a voltage. Now the results are much better than the former one, even without the cascode devices.

Uwe
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Old 9th December 2011, 10:52 PM   #602
EUVL is offline EUVL  Europe
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All great results. Congratulations.


Patrick
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Old 9th December 2011, 10:59 PM   #603
EUVL is offline EUVL  Europe
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BTW there is a third member of the test team who has been giving me very detailed reports of his tests and many valuable suggestions and feedbacks.

I also thank him sincerely for all his hard work, but leave him to decide whether he wants to post his results.


Patrick
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Old 10th December 2011, 03:41 AM   #604
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Hi Uwe,

Thank you, yours too! Making a DIY test and measurement setup like yours work well is much more interesting than what I am using. I enjoy making tools and fixtures as much as the projects themselves...

Dave
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Old 10th December 2011, 05:51 PM   #605
EUVL is offline EUVL  Europe
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Those who might like a very simple phase splitter to convert single ended signal to balanced might want to have a look at this :

Fet based phase splitter?

Don't use this to supply the F5 for THD measurements.




Patrick
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Old 11th December 2011, 08:44 AM   #606
ashaw is offline ashaw  Australia
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So I am in the middle of testing the protection board. All seems to be going well so far. Current measurements:
The power supply ripple is 20mV on the +/- 12V rails and 8mV on the 5V rail.
Every part of the circuit that I have tested so far works.
Supply voltages are OK accurate (set by 7800 regs).
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Old 11th December 2011, 08:57 AM   #607
EUVL is offline EUVL  Europe
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Are we then ready to release the protection board after you send us the revision ?


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Old 11th December 2011, 09:02 AM   #608
ashaw is offline ashaw  Australia
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Not quite yet, will finish testing tomorrow. However I cannot see anything going wrong there.

A general question: what would people prefer for connectors on this board?
No connector, just 0.8mm holes;
4 pin JST connectors;
The MOLEX 2mm connectors that are on the current board.

None of these will hold up the release of these boards.
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Old 11th December 2011, 09:34 AM   #609
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Quote:
Originally Posted by ashaw View Post
Not quite yet, will finish testing tomorrow. However I cannot see anything going wrong there.

A general question: what would people prefer for connectors on this board?
No connector, just 0.8mm holes;
4 pin JST connectors;
The MOLEX 2mm connectors that are on the current board.

None of these will hold up the release of these boards.
Molex 2mm connectors work for me.
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Old 12th December 2011, 10:04 PM   #610
alazira is offline alazira  United States
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Quote:
Originally Posted by ashaw View Post
Not quite yet, will finish testing tomorrow. However I cannot see anything going wrong there.

A general question: what would people prefer for connectors on this board?
No connector, just 0.8mm holes;
4 pin JST connectors;
The MOLEX 2mm connectors that are on the current board.

None of these will hold up the release of these boards.
I'd prefer 0.8mm holes.
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