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Minimalist A/B fet amplifier
Minimalist A/B fet amplifier
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Old 17th February 2003, 01:21 PM   #21
Banfi T. is offline Banfi T.  Hungary
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Location: Feketeerdő
" The only problem with MAT04s is their small 40v breakdown voltage, which limits your supply to +/-20v. Either you add a current mirror, or a cascode or just use them in parallel for the input pair." - carlmart

Yes, if the MAT04's base sits on the -20V rail

By the way, parallelling does not helps too much when to voltage is too high....
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Old 17th February 2003, 01:30 PM   #22
halojoy is offline halojoy  Sweden
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Question be a drain - or - be a source

Originally posted by traderbam
"The input stage, if it is has some amplification,
will be the heart of the amplifier.
And give the "sound"."

I disagee. The input stage is just the subtractor. Even with a perfect subtraction the amp's output will not be a perfect, enlarged copy of the input. Getting the subtractor to work accurately is important but not very difficult compared to the rest of the circuit.
All details have some importance.
So, where is "the heart" of your power amps?, traderbam.
Do they have any heart at all?
So, you do not pay much attention to the input stage?
You think the output devices are more important?
Well, we all have different ways of designing.

How easy to be critical and turn down what other say.
I am glad there are positive people at this site as well.
And if you break down the opinion of another,
give your own opinion in that place.

So, lets hear where traderbam, the critical man,
consider the heart of his amplifiers is situated.

/halo - some people drain - others are my source of joy & inspiration

traderbam is not very far from my ignore-list
and that list is not EMPTY, I tell you!
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Old 17th February 2003, 01:59 PM   #23
traderbam is offline traderbam  Europe
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Default Ignoring is bliss

I cannot think of anything I'd like more than for you to ignore my posts. Please add me to your "ignore" list immediately. Thanks.
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Old 17th February 2003, 02:10 PM   #24
carlmart is offline carlmart  Brazil
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Originally posted by Banfi T.

Yes, if the MAT04's base sits on the -20V rail

By the way, parallelling does not helps too much when to voltage is too high....

Of course not. In this case I suggested pralleling to improve noise in the first stage. I thought it was implicit.

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Old 9th June 2003, 12:58 AM   #25
millwood is offline millwood  United States
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Join Date: Apr 2003
Location: US
Originally posted by Tarasque

You HAVE to build this as described on Aren's page.
Aren's FET amp

Let me know what you think...
This is a design that used a CMOS inverter as input and driver stages. I did this approximately 15 years ago, while working on a project that required a lot of CMOS logic ICs.

The design is sound in that an inverter is essentially an inverted open-loop op amp. While the sound isn't top notch, it did work.
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Old 13th June 2015, 03:15 AM   #26
ericfe1975 is offline ericfe1975  France
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Originally Posted by nobody special View Post
I was looking for the same thing- just a basic A/B p-p mosfet amp. Couldn't find anything, so I decided to start working on my own. I don't know if you'd call it minimalist, but it certainly isn't that complicated!

Hi ,
very interesting schematic, have you build it, or only simulations? how does it sound?
I am looking for a class AB that sound very smooth.

Cheers from France

Last edited by ericfe1975; 13th June 2015 at 03:24 AM. Reason: forgot to quote
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