LT3062 based PSU

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#47
bk856er said:
I'm having 10 PCBs made including a stainless steel stencil, so the SMD components can all be reflowed including the very tiny LT3062 chip. Rudi will take a couple of reflowed boards, but if anyone else is interested just let me know. You'll be responsible for the through-hole stuff and cost will be parts + shipping. Will update here after a successful build. Timeframe should be 2-3wks.

BK
Click to expand...

Wow, that was fast! Received the boards from Elecrow today and they look really good. Status had been unchanged and "in production" all along, then they simply showed up and in my hands in <1 week from order placement. Amazing.

BK
 
#48
Yeah, Elecrow doesn't mess around! I received my first order from them today also. I chose the supposedly "slower" shipper option, but the boards arrived much sooner than I expected and look great.

How about sending me a PM with the price including shipping and your PayPal address?

Thanks.
 
#49
ammel68 said:
Yeah, Elecrow doesn't mess around! I received my first order from them today also. I chose the supposedly "slower" shipper option, but the boards arrived much sooner than I expected and look great.

How about sending me a PM with the price including shipping and your PayPal address?

Thanks.
Click to expand...

Let me make sure everything works before I take any money. The boards come in pairs, so you OK with two boards/supplies? Not certain of your application. Rudi's amps would use two supplies. Need to place a digikey order for the chips.

BK
 
#50
I was under the impression that one board could be used as +/- supply if using a wire for the JP connection.
That's what Rudi stated in post 39.
Is this not the case?

My application is a +12VDC/-12VDC supply for op-amp circuits.

I don't need, or can use, 2 separate boards for a bipolar supply.
This would be double the cost for everything.
In that case, I might as well stick with my LM317/337 boards that I'm currently using.
 
#51
Ammel, I came across the LDO regulators from LINEAR, when I was looking for a "clean" PSU for Calvin's phono pre that needs a +/-18 VDC PSU.

A "simple" LM317 / LM337 PSU didn't do it: it generated too much hum.
A LM3x7 tracking pre-regulator "behaved better", but I finally chose a LDO regulator from LINEAR.
Be aware that it can handle a maximum of 200mA of output current.

You will of course be able to adjust the LT3062 PSU to +/- 12VDC.
The image attached shows the PSU being adjusted for +/-15VDC to operate a MUSES volume attenuation IC.
I am currently checking, if a 2x12VAC print transformer will do the job.

Best regards - Rudi
 

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#52
Have a look at the datasheet of the LM317L: http://www.ti.com/lit/ds/symlink/lm317l-n.pdf

The LM317L with 22uF at the adjust pin has about 20uV rms noise.

The Power Supply Rejection of the LM317L is about 85dB @ 100Hz.

These specs are similar to the LT3062. The only substantial advantage
of the LT3062 is a lower drop-out voltage.

There are occasions where the LM317 is not good enough, but i doubt that
the LT3062 is the answer.

Udo
 
#53
Udo: I am sure that you have listened to a LM317/LM337 - PSU driving a "sensible" phono-pre buffer and that you have even improved your build by a LM3x7 tracking pre-regulator.

I am as well sure that you know about the differences of "datasheet statements" and "reality".
(If you are not: please have a look at this thread: http://www.diyaudio.com/forums/powe...acking-pre-regulator-current-regulator-2.html , it is an example).

I have improved my LM317/LM337 PSU by a tracking pre-regulator (see attached image - regulator is on top) and have read the substantial articles.

After all my choice is either the LT3062 or the TPS7A4700.

Best regards - Rudi_Ratlos
 

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#55
Rudi_Ratlos said:
Be aware that it can handle a maximum of 200mA of output current.

I am currently checking, if a 2x12VAC print transformer will do the job.
Click to expand...

Thanks Rudi for the information.

My circuits won't be drawing anywhere near 200mA, so no problem there.

If you find that a 2x12VAC transformer will work, here's the one I'm considering purchasing:
http://www.mouser.com/ProductDetail/Tamura/3FD-524/?qs=sGAEpiMZZMvwUzoUXIIvyVgtLw924glFapQHsnTpsT4=
Will it fit onto the board and work okay?
 
#56
ammel68 said:
I was under the impression that one board could be used as +/- supply if using a wire for the JP connection.
That's what Rudi stated in post 39.
Is this not the case?

My application is a +12VDC/-12VDC supply for op-amp circuits.

I don't need, or can use, 2 separate boards for a bipolar supply.
This would be double the cost for everything.
In that case, I might as well stick with my LM317/337 boards that I'm currently using.
Click to expand...

No worries. Let me first verify the build then we can revisit things.

BK
 
#60
kasey197 said:
Udo, you can see this article as well for some info on 317 (not L) with bypass caps, and some simple shunts to reduce noise (page 2+3) Simple circuits reduce regulator noise floor | EDN

ps sorry to rudy for the OT post 🙂
Click to expand...

There's been umpteen number of articles/ideas/suggestions on ways to improve the LM317/337 regulators.
This is just one of many.
I've read over a lot of them and there seems to be little agreement as to what values of Cbypass and Cout to use.
I typically use lower values, but I see some people using quite high values(100uF-1kuF) for Cout.
The only thing that most agree on is that these caps should NOT be low ESR caps.

Anyway, I hope we're not derailing this thread into another LM317/337 thread.
 
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