[sdiy] HV Voltage translation

[Karl Ekdahl]

Hi Mike,

The problem i have is that i want a variable voltage, basically a small voltage controlling a high one. The HV opamps are nice but expensive and if i'd at some point would want to go with higher voltages the opamps gets *seriously* expensive...

Karl

----- Original Message ----
From: mike ruberto <somnium7 at gmail.com>
To: Karl Ekdahl <elektrodwarf at yahoo.se>; Synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 20, 2007 11:52:30 AM
Subject: Re: [sdiy] HV Voltage translation

HI Karl,

I've been working on my mixing console again which has +/- 22V rails
and looking for devices to replace it's output amplifier modules.

This looks somewhat promising though I think the parts count is too
high for my available space:

http://www.tnt-audio.com/clinica/dynamicopamp_e.html

Also there are many op-amps that can run on 44 volt supplies. The
OP275 seems like a decent one:

http://www.analog.com/en/prod/0,2877,OP275,00.html

Many standard opamps also have a high voltage model available.

M. A. Ruberto

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!
>
> Karl
>
>
>
>
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