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Old 4th February 2013, 01:38 PM   #111
VT67 is offline VT67  Belgium
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Quote:
Originally Posted by jean-paul View Post
They look good but did you use lead free solder ?

And how do they perform ?
Are you asking this because the soldering looks a bit dull in the picture?
Answer; Bad picture

Regards
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Old 4th February 2013, 02:28 PM   #112
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That's the same what I say when somebody asks me ! No such problems when using Fluitin.
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Old 11th February 2013, 04:36 PM   #113
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Hi All

I'm now connected to Internet !
10 days before beeing "online" due to a pair connexion mismatch...
So what's up ?

Regards

Phil
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Old 18th March 2013, 01:46 AM   #114
palmito is offline palmito  United States
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Default Increasing current delivery to 0.5mA?

Quote:
Originally Posted by jean-paul View Post
With a larger transformer you can supply 0.5 A. I guess it should be an off board transformer then or maybe a 5 VA version exists that fits on the board ? When using an off board transformer please use safe wiring to the PCB or go straight from the transformers primaries to the fused IEC receptacle.

Now you do the math for the current limiting resistor PCB tracks are quite wide but we havent tested the PCB for 1 A (or more) for instance. You are on your own trying stuff out.
I want to use one of my PS boards to supply 0.5mA. I looked at the LM723N datasheet and it indicates to use the formula
Ilimit = Vsense / Rsc for the 2-7v output level
R5 is Rsc, but what is Vsense ? Please pardon my complete ignorance, I just want to figure out what size current limiting resistor to use to get a 0.5mA PS. I got a slightly over-sized 0.8mA 9v potted transformer mounted externally to power the PS.

Thanks.
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Old 18th March 2013, 06:48 AM   #115
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Hi I think you mean 800 mA or 0.8 A. Vsense is 0.6 V.

Please be aware that you definitely will need a large heatsink and that this power supply was not meant for more than 0.5 A current nor was it tested for more than 0.5 A current. We made it exclusively for the DAC.

I will make the next version more versatile like with an onboard heatsink (if there will be a next revision). I just finalized 2 of the PSUs this weekend and the results are so good that I wish there would be a negative version of LM723.

Oh BTW LM723 is finally out of production now. Just found out when I ordered some.
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Last edited by jean-paul; 18th March 2013 at 07:09 AM.
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Old 18th March 2013, 09:49 AM   #116
palmito is offline palmito  United States
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Quote:
Originally Posted by jean-paul View Post
Hi I think you mean 800 mA or 0.8 A. Vsense is 0.6 V.
Yes! Thanks.
Quote:
Please be aware that you definitely will need a large heatsink and that this power supply was not meant for more than 0.5 A current nor was it tested for more than 0.5 A current. We made it exclusively for the DAC.
I will get the smaller transformer, I can always use the .8A for something else!
Quote:
I will make the next version more versatile like with an onboard heatsink (if there will be a next revision). I just finalized 2 of the PSUs this weekend and the results are so good that I wish there would be a negative version of LM723.
And compact! A next version for higher current supply would be most welcomed...
Quote:
Oh BTW LM723 is finally out of production now. Just found out when I ordered some.
Yes, when I went to Mouser to get the datasheet it was marked obsolete...
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Old 18th March 2013, 03:25 PM   #117
Ryssen is offline Ryssen  Sweden
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Quote:
Oh BTW LM723 is finally out of production now. Just found out when I ordered some.
Will there be a problem getting them for the GB then?
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Old 18th March 2013, 04:25 PM   #118
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Hi Ryssen

Don't think so, have a look there :
lm723 Linear Regulators - Standard | Mouser
Try with 511-LM723CN Mouser ref...
More than 4330 available at Mouser's, I've got other sources
Regards

Phil

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Will there be a problem getting them for the GB then?
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Old 18th March 2013, 08:02 PM   #119
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I think your children's children will be able to buy LM723 in the future. These were made in ultra large quantities. No TDA status (yet).
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Old 19th March 2013, 02:27 PM   #120
tome is offline tome  Macedonia
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Quote:
Originally Posted by jean-paul View Post
Just when I thought the right package was delivered it turned out to be a new bank card

Tome, did you already solder one ? Please tell me how you like it.
Sorry for my late reply but I wasn't active on Diy forum last month.
Yes i built one and here is pics for my near finished DAC. I use Hammond aluminium case and I'm very happy with results.
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