Re: this should be easy
From: Mike Fields (spam_me_not_mr.gadget2_at_comcast.net)
Date: 01/23/05
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Date: Sun, 23 Jan 2005 09:15:09 -0800
"Jim Thompson" <thegreatone@example.com> wrote in message
news:3bj7v058ov4d06s74qvp0hl1ql90nicaum@4ax.com...
> On Sun, 23 Jan 2005 08:40:55 -0800, Luhan Monat <x@y.z> wrote:
>
> >Mook Johnson wrote:
> >> I'm looking for a sine wave driver that can deliver 2 volts p-p 30Khz
sine
> >> wave into a 3 ohm load. +/- 4.5V rails are available and sine wave
will be
> >> the input. Distortion needs to be reasonable but not ultra tight. >1%
> >> maybe.
> >>
> >> I have a design using complementary NPN and PNP biased to class AB
(audio
> >> amplifier) with a opamp completing the loop and providing feedback to
> >> minimize the residual xover distortion.
> >>
> >> Thermal runaway is a high concern. I'm using large 2 ohm emitter
resistors
> >> on the output and diode biasing to compensate for temperature affects.
> >> Anything else I should be looking at? both xisters will be mounted to
a 6
> >> layer PC board with lots of copper underneath.
> >>
> >> This amp will be running above 125C (ambient) so the audio amp ICS with
the
> >> thermal cutoff will be of no use to me.
> >>
> >> Just looking for different opinions..
> >>
> >> thanks.
> >>
> >>
> >> P.S. Class D is also out due to noise issues in the immediate areas.
> >>
> >>
> >>
> >Hi,
> >
> >You have not said what this whole thing is for. From the description
> >you have given, it could be an electric cigar lighter. You get better
> >directions if you let people know just where you are going.
>
> RS-232 to TTL??? You have something against 1488 and 1489 ?:-)
>
> ...Jim Thompson
> --
OK, sometimes I have trouble "reading between the lines", but how
did we get from a 30khz amp at 120 deg C to RS-232 ??????????
mikey
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