[sdiy] Trimmers

[George Hearn]

>The Waldorf Q+ (and the AFB16 which uses the same filters) has a 
>different scheme that sorts out all the first order errors with 
>digitally controlled resistors directly in the circuit and then 
>corrects the higher order errors on frequency and resonance via CV 
>pre-distortion like the XPander (i.e. it is applied to the data that 
>goes to the CV DAC).

I would call a digital resistor a 'trimmer' to if it was used to adjust or
'trim' a parameter of the physical circuit.

>I would not think of any of these approaches as "circumventing the 
>need for trimming entirely".  Trimming removes imperfections and 
>variations from a circuit and so do these autocalibration routines.  
>They are designed to cope with a rather wide variation actually so 
>that cheaper components can be used.

I would not consider an auto-calibration routine as a kind of trimming like
done in hardware with resistors or digital pots.  Auto-calibration routines
are there primarily to remove the need for trimming.  G


Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+

Waldorf MIDI Implementation & additional documentation:
http://Synth.Stromeko.net/Downloads.html#WaldorfDocs


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