[sdiy] HV Voltage translation

[Steve Lenham]

At 08:03 AM 11/20/2007, Karl Ekdahl 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!
>
>Karl

Why not use an audio power amp IC as a "power opamp"? They are inexpensive 
and, for obvious reasons, have large output swings and PSU voltages.

Steve L.