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darkfenriz 5th September 2004 12:30 PM

Another out of this world topology
 
2 Attachment(s)
Hi again
Some poeple may ask why I tend to show bizzare and stupid topologies.
Are you fed up??
I'm just bored with always the same topologies again and again...
What I do is (pathetic?) trial to find some new ways
so I show you thoughts that came through my mind...
patience please....

This one uses 3 integrated OPAMPS and 3 short feedbackloops.

Values aren't crucial - take care to topology

Looking forward to comments
(schematic attached)

johnnyx 5th September 2004 01:07 PM

Why don't you get a Simulator program? LT Spice is free, from Linear Technology website. I haven't used that one, but I have a simulator. If I have an idea, I can draw it out, run the simulator, and see what happens. It really is a very good way of trying things out. You don't get the smoke that you get with a breadboard layout, and it will display all the operating conditions for you without the need for measurements. You would easily be able to try any topology you can think of.:D

Tube_Dude 5th September 2004 01:18 PM

Hi darkfenriz

Your amp is a transconductance amplifier ... output will be a CCS and it will have zero damping to the speaker.

darkfenriz 5th September 2004 03:38 PM

hi johnnyx

could you link this page...
maybe i should simulate things first but a simulator cannot tell me what is actually wrong and what to change


hi Tube_Dude
I don't get your point
what is CCS ?

thanks guys

Tube_Dude 5th September 2004 03:57 PM

Quote:

Originally posted by darkfenriz



hi Tube_Dude
I don't get your point
what is CCS ?

Is a Constant Current Source...that mean that it will suplly the some current independent of the impedance of the load.

In simple terms your amp will have a output impedance of MOhms.

For to make your amp a normal voltage amp you must take the feedback from the output...

darkfenriz 5th September 2004 09:07 PM

DEAR Tube_Dude

I thought that feedback loops taken from sources to the -input of opamps will do...
when one mosfet is open and the second closed there's huge current through the speaker and thus through the dren resistor..

much confusion....

Tube_Dude 5th September 2004 09:22 PM

Quote:

Originally posted by darkfenriz
DEAR Tube_Dude

I thought that feedback loops taken from sources to the -input of opamps will do...
when one mosfet is open and the second closed there's huge current through the speaker and thus through the dren resistor..

much confusion....

Yes ...much confusion :)

With your feedback schema you are sensing the current through the load...then making a current amplifier.

johnnyx 6th September 2004 08:23 AM

There are a couple of threads about driving a 'speaker with a current amplifier, there are some advantages, but I don't think that you intended to design such a thing.

What about the crossover region between positive and negative output currents? would it give high crossover distortion?

I think a simulator would tell you a lot, if you split the design into sections and simulated each section independantly, you would see what each section does, with all the operating conditions, and then you would have a good idea how the whole thing would work.

darkfenriz 7th September 2004 09:44 AM

2 Attachment(s)
yes, got it
shame it took me so long
i am slowly thinking
here i've corrcted my project using global feedback too.
it is also about 200W, but I fear it would be low-performance


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