[sdiy] Trimmers

[ASSI]

George,
On Sonntag, 1. März 2009, George Hearn wrote:
> I would call a digital resistor a 'trimmer' to if it was used to
> adjust or 'trim' a parameter of the physical circuit.

what would you call it if it just produced a correction CV?

> 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

If you want to get rid of the offset on a CV summer, you can provide a 
trimmer at some suitable node in the circuit, a DCR in place of the 
trimmer, a DAC in place of the trimmer or a (however produced) voltage 
at an extra input to the CV summer.  Where and why do you stop calling 
it trimming when the result is just the same?  Any auto-calibration 
routine only eliminates the need to measure and correct the offset by 
hand and really is an orthogonal issue (to me anyway).

[It would be nice if you'd convince your mailer not to quote 
signatures & trailers.]


Achim.
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