[sdiy] ADSR sustain question

Tom Wiltshire tom at electricdruid.net
Wed Nov 20 14:48:59 CET 2013


Ok, thanks both. I get it now. "Output impedance" is a good way of putting it, and that's why the buffer helps.

So…now I have to decide; to buffer or not to buffer! I think Uwe makes a good case.

Thanks,
Tom

On 20 Nov 2013, at 13:11, "Colin f" <colin at colinfraser.com> wrote:

> 
>> And which 
>> bit of the Sustain pot is causing the problem? In centre I've 
>> got 5K toward Vdd, and 5K to ground. Which of these 5Ks 
>> alters the Decay setting and why doesn't the other one affect it too?
> 
> Actually you've got 4k7 above the pot too.
> Even if you didn't, 5k to Vdd and 5k to ground is equivalent to 2.5k to
> (Vdd+0)/2
> In effect, the pot has an output impedance.
> 
> Cheers,
> Colin f
> 
> 
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