Rate my poweramp design

Thread Starter

simeonz11

Joined Apr 29, 2008
98
This is a power amp I have in mind , plz do not laugh yes I work things out brute force with my scope and breadboard , I am not a sim guy .

Here is the design I have in mind , input will be a sine wave about 2 V p-p anywhere from 300 hz to 20 khz . I am using op amps as phase splitters to drive the mosfets . This is what I believe to be a class A transformer coupled push-pull modified by me .

Mosfet will probably be a class-d lateral mosfet with 900 pf input capacitance and 12 , still choosing . Op amp is the lm8261 , wich is just perfect for my application from the looks of it .

So I am gonna be running 2 x mosfets per amp , so 1800 pf input , yes Its strange i know .

Transformer secondary is floating , load might be anything from capacitive to inductive , put an x value , I am not aiming for maximum power in 8 ohms or w/e , this can go from a couple mA to large amps , most likely a slightly reactive load load ... I wont go beyond 6 amps on the secondary side .

Transformer will be either 1:1 or 1:2 step up audio range type .

Plz tell me if this is good , is the biasing resistors good like this ? Do I understand things correctly ?
 

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Wendy

Joined Mar 24, 2008
23,415
One of the nice things about this site is the OP can delete their own posts.

Have you built this design?

I'm not an expert in this aspect, but I think MOSFETs don't handle linear very well. I could be wrong, I'm sure other opinions will join in.
 
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