More Experiments - Envelope Generators this time...
The Old Crow
oldcrow at Access.Mountain.Net
Wed Nov 22 22:22:47 CET 1995
On Wed, 22 Nov 1995 gstopp at fibermux.com wrote:
> phases of the envelope's cycle. These switches all have some finite
> impedance which places restrictions on the time constant range - if you
> want longer maximum times this means a bigger cap and/or higher resistance
> pots. Pots become harder to get over 1 Meg. This means a bigger cap. This
> means that your minimum times get longer too. As you get into the tens and
> twenties of milliseconds your attack/decay/release times start to become
> noticeably sluggish. Not that this is bad, but it should be adjustable and
> not a design brickwall. Chip ADSR's use tranconductance amps internally.
> Discrete designs use discrete NPN and PNP transistors. The EN designs
> either use diodes or 4016/4066-type analog switches.
I wonder how a TMOSFET would work here. I use them all the time
for power stages in variable-frequency 3 phase inverters; it seems like the
low-current versions would work fine as cap gates on the A/R stages (the
on-resistance of a TMOS part is about 0.01 ohms.) Never really thought about
any musical applications of them before...hmmm...
/* Christopher S. Rider */
/* http://www.mcs.com/~syzygy/ */
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