Ahh. I think I'm starting to understand.
The PWM can be connected to a pot to set the width of the pulse? Is
that what you are saying?
And without this, the pulse width would be so thin, that there's no noise?
How would I wire a pot to the PWM? I'm thinking the PWM to the wiper
of a pot, and the to other ends to +/- voltages?
Cole
The PWM can be connected to a pot to set the width of the pulse? Is
that what you are saying?
And without this, the pulse width would be so thin, that there's no noise?
How would I wire a pot to the PWM? I'm thinking the PWM to the wiper
of a pot, and the to other ends to +/- voltages?
Cole
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
>
> >I connected the PWM to a front panel jack. Did you mean the SQ wave
> >doesn't work when there's nothing modulating the PWM input? Or that
> >it has to be connected to the front panel?
>
> It needs an input, usually from a pot, to work. If it doesn't have
one, the
> detection voltage the op-amp is seeing is outside the range of the
signal.
>
> Ken
>
> >
> >Cole
> >
> >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >>
> >> 1) Use a different VCO output. The square wave likes the PWM
input to be
> >> connected.
> >>
> >> 2) Sweep the tune knob, and if you still don't hear anything , try
> >adjusting
> >> the SPAN and ZERO trimmers. This VCO can quite happily work well
> >above the
> >> hearing range if these are wrong.
> >>
> >> Ken
> >>
> >>
> >> >Hello everyone,
> >> >
> >> >I've build a small system, only the bare minimum to make music,
so far.
> >> >
> >> >I have the following modules built:
> >> >Oakley Basic VCA
> >> >Music From Outer Space Lowpass Filter
> >> >Music From Outer Space Envelope Generator
> >> >CGS VCO
> >> >
> >> >I hooked everything up today, but there's no noise coming out. This
> >> >is how I've it patched:
> >> >VCO -> Filter -> VCA
> >> >and
> >> >EG -> VCA
> >> >
> >> >I'm thinking there's a problem with the VCO. I've only wired three
> >> >things: 1V/Oct input, tune knob, and square wave output. I tried
> >> >hooking this straight into my keyboard amp, but did not get any
sound.
> >> >
> >> >Also, I have no idea if the EG or Filter are working. Is there
anyway
> >> >to test them without a VCO?
> >> >
> >> >The VCA seems to be working. I connected my guitar to it, and the
> >> >gain knob DID change the volume, so that's good.
> >> >
> >> >Where should I start troubleshooting?
> >> >
> >> >Also, when I was first starting up the system with the VCO in
place, I
> >> >was testing to see if it was getting the correct voltages from the
> >> >power supply. It was, but, when I was probing it with my
multimeter,
> >> >I accidentally touched the bracket that the PCB is connected to.
This
> >> >created a small spark... Could I have shorted the circuit,
making it
> >> >unusable?
> >> >
> >> >Any help would be wonderful. This is very discouraging.
> >> >
> >> >Thanks,
> >> >Cole
> >> >
> >> >
> >> >
> >> >
> >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >> >
> >> >Yahoo! Groups Links
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
_______________________________________________________________________
> >> Ken Stone sasami@
> >> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> >> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>
> >>
> >
> >
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>