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Old 6th February 2004, 12:47 PM   #1
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Question power amplifier with one-stage voltage amplification

What do you think about scheme of power amplifier with one-stage voltage amplification such use in AD797?
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Old 6th February 2004, 12:56 PM   #2
sss is offline sss  Israel
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ad797 got more then one voltage gain stage
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Old 6th February 2004, 05:42 PM   #3
markp is offline markp  United States
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An op-amp is hardly 'one' gain stage! It is one package though. My amps only have a differential input, a voltage gain driver, and outputs. Simple, clean, and effective.
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Old 6th February 2004, 08:16 PM   #4
PMA is offline PMA  Europe
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Default Re: power amplifier with one-stage voltage amplification

Quote:
Originally posted by alex0
What do you think about scheme of power amplifier with one-stage voltage amplification such use in AD797?
Will you get enough voltage swing from AD797 or do you intend to use power stage with some voltage gain (say 2x).

Pavel
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Old 7th February 2004, 02:27 AM   #5
jcx is offline jcx  United States
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Old 7th February 2004, 12:02 PM   #6
djk is offline djk
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"What do you think about scheme of power amplifier with one-stage voltage amplification such use in AD797?"

The AD 797 gets really good performance out of only one voltage gain stage, doesn't it?

That complementary output stage (diamond follower) is nice too, 50mA of drive!

Try this site:

http://home.kimo.com.tw/skychutw/

click on:

circuits, and then on:

Hadley 622

You should end up here:

http://home.kimo.com.tw/skychutw/Circuits/Hadley622.pdf

Update the output stage to a diamond follower and there you are: a very low distortion single voltage gain stage amplifier.

It even has the Nelson Pass 'X' feedback arrangement.

It even has the bootstrap current source the AKSA crowd likes.

One set of drivers and outputs (2 each of MJE15030/31 and MJ21193/94) should give 200W/4R
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