Cgs synth

Richard,

I am not getting anything from the SQ output.

Cole

--- In cgs_synth@yahoogroups.com, Richard Brewster <pugix@...> wrote:
>
> Wait a minute. The PWM input does not need to be connected up. The
> 100K resistor to ground from the - input of the comparator sets the
> detection point to zero. And the AC-coupled sawtooth wave going to the
> + input of the comparator centers the waveform around ground. So
> without anything else connected you should get a nice square wave from
> the SQ output.
>
> -Richard Brewster
> http://www.pugix.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
> >>>
> >>>
> >
>