[sdiy] Trimmers

[cheater cheater]

Another option is to fix up the parts that generate the incorrect
voltage, or that process the voltage incorrectly... by piggy-backing
resistors for example..

On Mon, Mar 2, 2009 at 4:51 PM, ASSI <Stromeko at nexgo.de> wrote:
> 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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