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-   -   single mosfet output stage ? (http://www.diyaudio.com/forums/solid-state/93224-single-mosfet-output-stage.html)

AudioGeek 1st January 2007 01:47 AM

single mosfet output stage ?
 
ok... i know there has been some discussion about this before with various threads, but here goes again:

see:

http://www.marchandelec.com/ec616.htm

i am trying to figure out how they get 20db gain with a PS 42vdc with one output mosfet?

trying different combinations of drain and source resistors and cannot figure out how they got the values.

sooo....

i kinda want to do something similar... but use a 1:1 input tranny then the output stage.

how do i determine the exact resistor values... say using a irf140 as mosfet without randomly using simetrix or similar to find them?

thanks!!!

flg 1st January 2007 02:31 AM

They use a realativly hi gain FET :D A load R of 10 or 11 ohms or so and as small a source R as they can get away with :D
The amp probably has a damping factor of 1 :bigeyes: and THD about the same. Input Z can't be much higher either :D
Might I suggest a ZEN Amp instead :cool:


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