[sdiy] HV Voltage translation

[John Luciani]

On Nov 20, 2007 11:03 AM, Karl Ekdahl <elektrodwarf at yahoo.se> wrote:
> Hi list
>
> I need some help amplifying a DC signal to voltages that is beyond the common opamp range, say 0-5V amplified to 0-30V for example. I was thinking that one of the easiest ways should be to use a opamp with a transistor in it's feedback loop but i cannot really seem to make that work. Any ideas greatly appreciated!
>

You could use an op-amp and a FET to adjust the output of an LM317
(Vout < 37V) or a LM317HV (Vout < 57V).

Also you could try searching for linear regulator circuits and
feedback voltage regulator circuits.
There are some applicable examples in "The Art of Electronics" book.

(* jcl *)


-- 
http://www.luciani.org