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Old 25th February 2012, 07:15 AM   #31
Frex is offline Frex  France
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Hello all,

I've finally ordered a new set of drilled and engraved front and rear panel of the PSU to Schaeffer-ag.
I discover their services, and cost is very reasonable.
So, i wait these new panels, with color marking for a beautiful finishing.
I have find also another green windows that give a very good display result.
(i use a translucent green CD cover ! ).

I've also made some tests, connecting PSU outputs in many serial configurations, and all pass successfully.

I don't have much time right now to perform all needed test, but i'll post any results as they become done.

Maybe, if some DIYers are interested to build this project, i could open a wiki page to summarize infos about it and create a list of potential builders.
Please, give me your feedback about that...
Regards.

FRex
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Old 4th March 2012, 05:51 PM   #32
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Nice work, excellent handicraft.
Impressive that you wound your own off-line transformer, shows that you know what you are doing. I have a question refereing to the schematics-
D14,D19,D23 , what are their purpose ? the Vsense is at Vref (1,2 V aprox) ?
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listen! Can you hear that ...
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Old 4th March 2012, 06:27 PM   #33
Frex is offline Frex  France
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Hi rikkitikkitavi,

Thank you for your interest.
The three zener diodes D14,D19 and D23 protect the TPS5450 feedback inputs from over-voltage. This is need because the OPAMP that drive these inputs is supplied from the buck input voltage (~22Vdc).

Normaly, i will receive my newly drilled and engraved panels from Schaeffer this thuesday...
That's cool....

Frex

Last edited by Frex; 4th March 2012 at 06:29 PM.
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Old 6th March 2012, 04:06 PM   #34
Frex is offline Frex  France
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Hi all,

I've receive as expected my new front and rear panel from Scheaffer today.
It's the first time i use their service and i'm very impressed.
It's a very clean job as you can show below.

Click the image to open in full size.

I will mount them tomorrow and new pictures will come soon.
Regards.

Frex
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Old 6th March 2012, 04:11 PM   #35
carpin is offline carpin  Netherlands
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Nice panels Frex
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Old 6th March 2012, 05:27 PM   #36
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Very nice psu. I can use a bench power supply. Is this available?
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Old 6th March 2012, 06:04 PM   #37
Frex is offline Frex  France
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Hi merlin,

I will organize a PCB group buy and a wiki dedicated page when the project will be fully finished.

Frex
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Old 6th March 2012, 06:59 PM   #38
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Great thanks!
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Old 10th March 2012, 01:03 PM   #39
Frex is offline Frex  France
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Hello all,

The new panel has been mounted now, they give a professional look of the PSU.
You can see the results on some pictures below.

-1 - Front view, off state.
Click the image to open in full size.

-2 - rear view.
Click the image to open in full size.

-3 - front view, on state.
Click the image to open in full size.

-4 - Front view with Metrix AX322 PSU for size comparison.
(The EPSUX3 is also very lighter than AX322!).
Click the image to open in full size.


Before to terminate this design, i must optimize the current regulating loop that oscillate in some conditions. That will be only change some parts values.
Then after that, doing a complete and accurate measurements table for each output.
I've weigh the PSU (without cord) and it's only 1.2kG (2.64 pounds).

I hope to open the new wiki page for the PSU project very soon, and starting to take the name of interested DIYers to get the PCB.
Because i understand that building the flyback transformer can be a barrier to build this PSU project, if enough buyers are interested i could try to order the transformer to a manufacturer.


Frex.

(I've already start a new project, a power amplifier for my squeezbox Touch, but you be informed about it later. )
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Old 10th April 2012, 05:31 PM   #40
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That looks great. I could use a bench power supply. Awesome work on the case too.

Are you going to make the boards or kit available?
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