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TL431 linear power supply

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spec:
UPDATE #1   2018_12_18 The attached schematic has the opamp input connections reversed- see reply #77 for revised schematic.

Hi mike_mike

I got the message that you wanted to use parts from your spares box, so I did the attached schematic for you:
(and from the above post I see you need components second sourced in Romania)

mike_mike:
Thank you.
But I cant see were is the current limit or the short circuit protection...

spec:

--- Quote from: mike_mike on December 14, 2018, 07:11:36 pm ---Thank you.
But I cant see were is the current limit or the short circuit protection...

--- End quote ---
No sweat.  :)
There isn't any current limit- didn't you say that you didn't need current limiting in one of your posts?

spec:

--- Quote from: David Hess on December 14, 2018, 12:51:06 pm ---
--- Quote from: not1xor1 on December 14, 2018, 08:22:22 am ---you must be kidding  ;D
a 20V/µs opamp with a huge 1µF compensation capacitor...
and what would be the advantage versus a proven and foolproof design using the traditional LM723 ?
--- End quote ---

The compensation capacitor is way too large but a fast operational amplifier like that would be selected for lower noise.  I have done the same thing many times using an LT1007 or OP27.

--- End quote ---
I don't mess about with compensation. :-DD

mike_mike:
I need current limiting. I dont need current limiting led.
I need something like a transistor and a power resistor for current limiting. And I dont need that the current limit to be variable.

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