[sdiy] Re: [AH] Importance of using 100k resistors - real answer

Ken Stone sasami at hotkey.net.au
Thu Oct 12 00:38:21 CEST 2006


If we are going to get technical though, the 1V/oct specification is
actually 1V/oct INTO A 100K LOAD. Thus it's frequenct choice.


>100K is not that "magical". It can be 91K, 127.342222K. It just needs to be 
>"high enough" so that it doesn't load down what is plugged into it (because
the 
>signal coming IN has an associated output impedance, and you want it at least 
>100X whatever *that* is, and in audio it was 600ohms and also 35 years ago 1% 
>resistors were EXPENSIVE and 100K is an even power decade and it's easy to 
>remember, easy to write down).
>
>Paul S.
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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