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From: John Woodgate
Subject: Re: amplifiers high gain low current
Date: Tue, 17 Sep 2002 19:51:06 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Tue, 17 Sep 2002 20:38:41 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that John Popelish
wrote (in <3D874DD5.C2262583@rica.net>) about 'amplifiers high gain low
current', on Tue, 17 Sep 2002:
>Samuel Kristanto wrote:
>> My name is Samuel, I have a problem with my final project.
>> I have a power supply that step up from battery 3V to 50V(10mA)--> I
>> use boost regulator from Mic2570-2BM.
>> Now I have to make an amplifier using the output from my soundcard to
>> the input of my amplifiers, I want to use maybe an OP-AMPS but its
>> very difficult to find the OP-AMPS that fit with 50V and need better
>> power than 500mW. Please help me to solve this amplifiers problem.
>> please reply me at : email@example.com
>> Thanks a lot
>> Samuel Kristanto
>High voltage opamps that draw less than 10 ma are available, but they
>may not be cheap.
True, but the system is crazy. Why convert 3 V to 50 V and then have to
find a HV op-amp, whereas conversion to 20 V or so would allow normal
op-amps to be used?
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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