ASM is Done!!
Byron G. Jacquot
thescum at surfree.com
Sun Dec 19 05:04:49 CET 1999
>1 When the res (Q) is at around 95% - 100% and I spin the cutoff freq knob
>all the way there is one little point in the rotation (around 45% or 11
>oclock)where there is noise almost like distortion or the type of fuzz that a
>bad pot would cause . But its not the pot becuase this only happnes when the
>Q is at around 90% or above. ?
If you've got the oscillators running directly in with no attenuation, then
the filter may crackle a bit when the cutoff point crosses the harmonics of
the waveforms. You just need an attenuator on the input, to scale the input
waves down a bit. Solved that crackle for me.
>3 The inital pulse widt knob is only active in a narrow band from around 10
>oclock to about 2 oclock, in which the PW does change, but Id like to have
>full spectrum available here........
You could put a couple resistors on the PW pot: one between the top lug and
V+, and the other between the bottom lug and V-. Since you've got a useful
range of about 1/3 of the rotation, then resistors of a value about equal to
the pot should do the trick.
>My MIDI/CV converter isnt ready yet, and im not done with my dedicated CV
>keyboard, so I was wondering.. Can I use the square LFO set slow to trigger /
>test the env generators? Any way to do this without a real gate/trigger/cv
>source?
The LFO should work fine, though it's been recommended to put diodes on the
gate inputs of the ADSRs if you're going to try to trigger them with a
bipolar waveform. Otherwise they act really wacky. (Been there, done that!
Thwe diodes are a must!)
You could also use a toggle switch that closes to a suitably high voltage,
with a pulldown resistor.
Byron Jacquot
More information about the Synth-diy
mailing list