Re: this should be easy
From: Jim Thompson (thegreatone_at_example.com)
Date: 01/23/05
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Date: Sun, 23 Jan 2005 09:15:20 -0700
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
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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