High precision voltage regulator

[dody_b]

Hi all …:'(

I

[dody_b]

Hii All !!!!!!!!!!!
???

do anyone want to help me ?

I need a reply
Please  :-\

Dody

[plouf]

LM138 supposed to have 0.0 - 0.2% diffirence with a worst case max 0.4

duno any other , however the bigger capacitor you add to input the more accurate output it gives ...

btw how can a circuit be so strict in power suply ?
most components are not so acurate anyway ?
it is a reference voltage ?

[dody_b]

Thank you for reply my question

I want to use ADC 22 bit, so even 1ms ripple can make my data gone crazy.
Is there any more suggestion, I would  happy with it
:)

[audioguru]

Hi Dody,
You don't give any details about what you want and why, so you have few replies.
1) What are you measuring and why doesn't it have its own regulation like an audio amplifier?
2) Line regulation?
3) Load regulation?
3) Ripple rejection?
Just a short piece of wire will drop more than only 2mV if it has any current in it.
A half-wave rectifier and a tiny filter cap will produce too much ripple voltage.

[hotwaterwizard]

Why not add a batery into the mix to smothe out the voltage even more.
A battery will act as a big capacitor.
Use a silver Oxide or Nicad and draw the power from the battery while charging it with the power supply.