On my NTO, sine and triangle are 180 degrees out of phase with one another.
This could just be from an extra inverting op amp in the circuit.
The sawtooth edge coincides with the peak of the sine wave, where the slight
discontinuity is seen.
Sine and sawtooth position on the variable wave output look nothing like the
normal sine and sawtooth outputs, or any mix in between.
Sine out and variable out set to sine have different phases, 180 degrees
apart. The variable "sine" peak is much sharper than the valley.
I maintain that the variable out can't be a quad crossfader. For instance,
the square to pulse transition changes the pulse width of the waveform from
about 40% to 90%. It does not create a stairstep in the intermediate
position as you would get by crossfading square and pulse waveforms.
What was the vintage of the NTO you repaired?
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
This could just be from an extra inverting op amp in the circuit.
The sawtooth edge coincides with the peak of the sine wave, where the slight
discontinuity is seen.
Sine and sawtooth position on the variable wave output look nothing like the
normal sine and sawtooth outputs, or any mix in between.
Sine out and variable out set to sine have different phases, 180 degrees
apart. The variable "sine" peak is much sharper than the valley.
I maintain that the variable out can't be a quad crossfader. For instance,
the square to pulse transition changes the pulse width of the waveform from
about 40% to 90%. It does not create a stairstep in the intermediate
position as you would get by crossfading square and pulse waveforms.
What was the vintage of the NTO you repaired?
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
> -----Original Message-----
> From: Peter Grenader [mailto:peter@...]
> Sent: Tuesday, June 08, 2004 6:28 PM
> To: SergeModular@yahoogroups.com
> Subject: Re: [SergeModular] Re: Quadrature Oscillator
>
> Steve Ridley wrote:
>
> > Can't remember if the
> > Sine out and NTO Variable out set to sine have the same
> > phase.
>
>
> I belivee they would be - as the variable out is a quad panner in reverse
> (or so it seems form the unit I had for repair). So it takes the four
> waveshapes and pans between them. I was talking about the triangle and
> sine
> being out of phase.
>
> - P
>