Electronics > Beginners

TL431 linear power supply

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T3sl4co1l:
Simplest possible supply that meets those requirements:
- Phase controller or VARIAC
- 18 to 20VAC transformer, rated 8-10A RMS
- Rectifier, capacitor filter

You did not specify anything further in depth like regulation or noise, or adjustable current limiting, or cost, so #4 is easiest to optimize.  This uses about six parts (including fuse and power switch), hard to beat. :)

Tim

mike_mike:
Thank you.
But I need a power supply made by me. I am a kind of maniac in electronics.
I need that the power supply to be variable via potentiometer and stabilized.

T3sl4co1l:
Literally just the first schematic, with an R+C connected between TL431 ref and cathode.  Say 10k and 1nF for starters.  Adjust values to give good step response.

Tim

xavier60:

--- Quote from: mike_mike on December 12, 2018, 05:58:49 pm ---Thank you.
But I need a power supply made by me. I am a kind of maniac in electronics.
I need that the power supply to be variable via potentiometer and stabilized.

--- End quote ---
You have not mention if you have tried adding compensation to the TL341 or not.
That first power supply circuit has the best chance of working properly than most others you are likely to find.
There are a few more small improvements that can be made. For example the overload LED can be moved to a better spot.
The BD140 isn't necessary.

spec:

--- Quote from: mike_mike on December 12, 2018, 05:58:49 pm ---Thank you.
But I need a power supply made by me. I am a kind of maniac in electronics.
I need that the power supply to be variable via potentiometer and stabilized.

--- End quote ---
:)

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