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'[OT]: Regulation voltage'
2001\03\21@130408 by

Hello!

Maybe some kind person want to help me
with this problem:

I have two voltages on 13,3 and 12V as I want
to take down to a level on 2,3 and 1V,
accordingly the same difference between them.
The voltages isn`t pre-set without changing
between 13,3 and 12V.
My intention is to with this voltage drive a
levelindicator.
Is there any IC as can do that or it`s possible
on any other way?

Regards
ÅkeN

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I have two voltages on 13,3 and 12V as I want
to take down to a level on 2,3 and 1V,
accordingly the same difference between them.
The voltages isn`t pre-set without changing
between 13,3 and 12V.
My intention is to with this voltage drive a
levelindicator.
Is there any IC as can do that or it`s possible
on any other way?

What are you trying to do with these voltages?
Why do you need to maintain the same difference or are you effectively
trying to measure the difference?
What is the level indicator telling you?
Are the voltages always 13.3 and 12 (if so its an easy task :-) ) or do they
vary and if so over what range?
How much does the difference vary by.?
Is one always larger than the other or can they swap?

What we really need to know to answer your question well is - "WHAT ARE YOU
TRYING TO DO?"

regards

Russell McMahon

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Hello Russell,

Thursday, March 22, 2001, 1:20:40 PM, you wrote:

RM> I have two voltages on 13,3 and 12V as I want
RM> to take down to a level on 2,3 and 1V,
RM> Is there any IC as can do that or it`s possible
RM> on any other way?

It seems, I seen some ICs on MAXIM web-site http://www.maxim-ic.com

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Best regards,
Alexey Musin
At 08:20 PM 3/22/01 +1200, Russell McMahon wrote:
>I have two voltages on 13,3 and 12V as I want
>to take down to a level on 2,3 and 1V,
>accordingly the same difference between them.
>The voltages isn`t pre-set without changing
>between 13,3 and 12V.
>My intention is to with this voltage drive a
>levelindicator.
>Is there any IC as can do that or it`s possible
>on any other way?

Use a Zener diode to "trim off" the excess voltage.

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> At 08:20 PM 3/22/01 +1200, Russell McMahon wrote:
> >I have two voltages on 13,3 and 12V as I want
> >to take down to a level on 2,3 and 1V,
> >accordingly the same difference between them.
> >The voltages isn`t pre-set without changing
> >between 13,3 and 12V.
> >My intention is to with this voltage drive a
> >levelindicator.
> >Is there any IC as can do that or it`s possible
> >on any other way?

I think he wants to reduce the voltages but still
keep the 1.3v difference between them? Zener diodes
are not perfect ,ie the zener knee varies greatly
with voltage changes. Maybe two opamps? One op amp?
What sort of level indicator is it?? :o)
-Roman

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