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Old 11th June 2013, 02:11 AM   #681
EUVL is offline EUVL  Europe
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Since the opamp is just standard SOIC8, you can use anything pin compatible, including the OPA604 as suggested.

I used OPA1641 as it is lower noise.
I personally would consider LT1792 first if I wish to go higher voltage than 36V.


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Old 11th June 2013, 02:13 AM   #682
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I was thinking along the lines of Jan making them available to help support the publication. If I can get the higher voltage version working and performing well, lll do the same. I have to blame you for gettin me on this SMD kick. Kinda addicting once you start. So much performance in such a little package.
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Old 11th June 2013, 02:17 AM   #683
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I'll discuss with Jan when I see him.
I know he does not want to sell PCBs (not even his own design); neither do we.
But we also know there is demand for this excellent design.

We'll see. But some more (3rd-party) testing to go through first.
So not for publishing in 2013.


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Old 11th June 2013, 07:12 AM   #684
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Originally Posted by buzzforb View Post
I have to blame you for gettin me on this SMD kick. Kinda addicting once you start.
Slightly OT: Bruno Putzeys article with the free PCB in Vol 5 got me started in SMD. I've done a few tries and I must say, if you have the right tools (very good tweezers and fine soldering tip) it's not bad at all. Even very fine pitch ICs are relatively simple: just pile up solder, do a pass with solder wick and you get a perfect solder connection, no shorts at all!

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Old 11th June 2013, 08:06 AM   #685
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Setup is key. I am actually faster now using SMD than I am with through hole. Make a weighted pointer to hold it in place and you can solder directly, no wick needed.
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Old 11th June 2013, 09:00 AM   #686
EUVL is offline EUVL  Europe
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Jan,

Try some 0402 LEDs. I"ll send you some if you wish.
They are currently my limit (my hands, not equipment).




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Old 11th June 2013, 11:49 AM   #687
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One more opamp to try -- ISL28110.


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Old 11th June 2013, 01:54 PM   #688
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THanks Patrick. I will add all the suggestions to the next order.
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Old 11th June 2013, 06:01 PM   #689
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Quote:
Originally Posted by EUVL View Post
I should add that I took the liberty to change a few things to suit my own use.
So it is not identical to the published version from Walt and Jan.
Hope they wouldn't mind.


Amongst others :

Voltage reference and zener are replaced by Panasonic SMD LEDs (3 in series)
Higher resistor and lower capacitor values for RC filters (to allow this size)
JFET input opamp (15V version uses OPA1641).
2x 2SK209BL degenerated to 3mA as current source for V_ref and start-up bias

Pin-out's are 78xx / 79xx compatible, with (optional) additional pins for output and ground sense.


Patrick

Nice improvements.
With RRIO, regulator can be simplified even further.
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Old 12th June 2013, 06:38 AM   #690
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Isn't it possible to glue down the parts before hand soldering ? Some glue that doesn't set instantly or catch fire when heated by the soldering iron ! What about rubber based glues ?

Do all you guys who hand solder such small parts use a large magnifying lens ?
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