Pass aleph 3 project

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Source resistors

Typical construction uses .3 to 1 Ohm. Now the Aleph is not a typical amplifier, but increasing the value reduces gain and increases linearity + load sharing (and also the output impedance.

You should be at .47 now. Suggest you try about .7 or even 1 or so as a starting point (R122 etc). You can also solve this problem by duplicating Q104 if you find a way to separate the output transistors.

A "normal" amp would require changes of source resistors both top and bottom. On the Aleph it is only the bottom that needs changing.

Petter
 
Re: how to choose power fets for audio

Petter:Another question - you suggest to change all this resistors (for example from 0.47 to 0.7 or so) or adjust them ( using different values) to the same current through the IRFPs ( ie to change for example to 0.2, 0.47, 0.47 and 0.33 , 0.7, 0.47 - my case)? What is the point of the Q104? Current source too?
 
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