FirstWatt J2

Sorry, my question was academic, I was just thinking about the control loop with two (or more) devices and the best way to control them - as a whole or individually, each has its drawbacks.

As for the J2, the PCB's Iv'e ordered have a single output - hope there's not too much debugging 🙂

Oops, Just spotted J3a drain not connected :sigh:
 

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If you wish to control the two current sources exactly, both for bias and for dynamic current modulation, then you should use separate optocouplers.
They are then only connected at the speaker ouput.
And then they do not need to be matched, whereas the Semisouth's still have to be.

Academic, as you said.


Patrick