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Old 20th May 2013, 09:49 PM   #2221
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by amsoque View Post
Thank you Frans. I'll post tomorrow a couple of pics of the PCB's.

I've already read the threads about PSU, but being not a specialist, with little understanding about electronics, you know... Explain me a thing. I bought two transformers rated 2X24 V at 750 mA (Triad). But I measured 2X28 V AC. Is this OK? That gives at the end of the pre-reg +/- 39 V DC without any load.

Emil
That's o.k. when not loaded the voltage may be a bit higher then nominal. The DC voltage is, about, 1.4 times the AC voltage. (and 1.4 * 28 = 39.2).
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Old 21st May 2013, 06:48 AM   #2222
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I think the issue of the shortage to ground is only on the latest batch of PCB's. My guess is that in order to make room for the compensation capacitors in the shunt, the resistor was moved to the right. In the same time the clearance rectangle from the bottom layer was not moved to the right, so the rightmost end of the resistor now accidentally connects the ground plane on the bottom layer. Maybe Alfred can confirm that also on the PCB file?
That connection should be removed, otherwise the short circuit can also create issues for the previous box (the pre-regulator).
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Old 21st May 2013, 07:39 AM   #2223
amsoque is offline amsoque  Romania
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Morning heavenly fellows!

Did you sleep well (the Europeans)?

So, let's try post some pics.
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File Type: jpg IMG_0246_cu explicatii.jpg (951.2 KB, 272 views)
File Type: jpg IMG_0249_detailed.jpg (714.0 KB, 261 views)
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Old 21st May 2013, 07:40 AM   #2224
amsoque is offline amsoque  Romania
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What do you think Alfred?

Emil
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Old 21st May 2013, 07:43 AM   #2225
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Al is on Holydays...
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Old 21st May 2013, 07:48 AM   #2226
amsoque is offline amsoque  Romania
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And a question:

What's about the X resistor, in parallel with the 10R, that appears in the schematic to be a 1M resistor. Should I put a 1 M resistor, or it is optional? And if yes, what wattage?

Emil
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Old 21st May 2013, 07:50 AM   #2227
amsoque is offline amsoque  Romania
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Ah, he told me something, that he travel this time ( a week ago). So, enjoy your holiday Alfred.

Emil
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Old 21st May 2013, 07:51 AM   #2228
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Old 21st May 2013, 08:24 AM   #2229
amsoque is offline amsoque  Romania
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Thanks Peter

Emil
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Old 21st May 2013, 08:57 AM   #2230
hesener is offline hesener  Germany
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Originally Posted by amsoque View Post
What do you think Alfred?

Emil
hi guys, so sorry about this mistake!! my sincere apologies....

the layout is quite crowded and double-sided, should have done a better job in checking the result and run one more DRC and ERC....

thanks a lot emil for the fix, i will also email this to all subscribers

alfred
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