[sdiy] ML317: 12V to 10V?

[Mykolas]

Hi all,

I'm building up VCO scale adjust tool (see idea:
http://electro-music.com/forum/viewtopic.php?p=307414#307414 ), and
thinking of
precise 10V reference (I can go down to 7V, no big deal), but I can
get only 12 pin
rotary switch, so extra pins with ref voltage will be in good use in future :)

I don't want it to adjust ref voltage each time I'll use it, so in
this case stable voltage to op-amp suits me.

I've got plenty 12V 100mA DC wall wart power supplies and wish to use
it in this project. I can dismantle it and use only transformer and do
other things by myself.

I'm thinking to use LM358D instead of TL082.

Other thing is: Can I change 10k 1% resistors to 100K 1%? More acuracy
I suppose?



2010/9/16, David G. Dixon <dixon at interchange.ubc.ca>:
>> > Can I use LM317 voltage regulator to have +10V out of +12V? (2V
>> > difference) Can't find on net.
>>
>> It may work, although 2V is a bare minimum Vin-Vout difference for the
>> 317.
>> How much current are you requiring on the 10V side?
>> You might consider a low-dropout (LDO) regulator if that is an option.
>
> What's your application?  Are you sure you couldn't just divide down to 10V
> and buffer with an opamp?  Or, if a precise 10V reference is what you are
> after, but not much current (< 10mA), something like REV102 might be more
> appropriate.
>
>


-- 

Mykolas
+370 67626261
www.analogas.uzrasai.lt