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Thread

sine, sine, everywhere a sine...

2002-09-10 by John Papiewski

The sine wave question came up here recently didn't it?? Or wuz it AH??

NTO/PCO sine waves have tiny pips in them, or mine do. I can hear the
extra harmonics esp. in the lower registers.
This is annoying - if I want purity I have to filter them or make a sine
wave from the VCFQ.

Yet I know someone who has a fairly recent vintage Serge that makes nice
sines that don't seem to buzz.
Could this just be a power supply or waveshape adjustment thing?

Any opinions or observations?

Thx

JP

Re: sine, sine, everywhere a sine...

2002-09-16 by John Loffink

No pips in my 2002 vintage NTO. This is probably something that can be
adjusted with a trim pot. It doesn't have anything to do with the power
supply. I don't have any PCOs to measure.

My NTO sine does have a slight flattening/assymetry of the waveform, but
all waveshaped sines tend to exhibit this.

John Loffink
jloffink@...

Show quoted textHide quoted text

> -----Original Message-----
> From: John Papiewski [mailto:johnp299792@...]
> Sent: Tuesday, September 10, 2002 12:16 PM
> To: Serge Modular
> Subject: [SergeModular] sine, sine, everywhere a sine...
>
> The sine wave question came up here recently didn't it?? Or wuz it

AH??

>
> NTO/PCO sine waves have tiny pips in them, or mine do. I can hear the
> extra harmonics esp. in the lower registers.
> This is annoying - if I want purity I have to filter them or make a

sine

> wave from the VCFQ.
>
> Yet I know someone who has a fairly recent vintage Serge that makes

nice

> sines that don't seem to buzz.
> Could this just be a power supply or waveshape adjustment thing?
>
> Any opinions or observations?
>
> Thx
>
> JP
>

Re: sine, sine, everywhere a sine...

2002-09-17 by sonicsynthi

--- In SergeModular@y..., "John Loffink" <jloffink@a...> wrote:

Show quoted textHide quoted text

>

Dear John,
Ditto . My Serge oscillators have a very good sine output. This is a
model I ordered from '94 .Do you have multiple NTOs showing the same
deformity on the scope ?
regards
PK

No pips in my 2002 vintage NTO. This is probably something that can
be

> adjusted with a trim pot. It doesn't have anything to do with the

power

> supply. I don't have any PCOs to measure.
>
> My NTO sine does have a slight flattening/assymetry of the

waveform, but

> all waveshaped sines tend to exhibit this.
>
> John Loffink
> jloffink@a...
>
> > -----Original Message-----
> > From: John Papiewski [mailto:johnp299792@a...]
> > Sent: Tuesday, September 10, 2002 12:16 PM
> > To: Serge Modular
> > Subject: [SergeModular] sine, sine, everywhere a sine...
> >
> > The sine wave question came up here recently didn't it?? Or wuz

> AH??
> >
> > NTO/PCO sine waves have tiny pips in them, or mine do. I can

hear the

> > extra harmonics esp. in the lower registers.
> > This is annoying - if I want purity I have to filter them or make

> sine
> > wave from the VCFQ.
> >
> > Yet I know someone who has a fairly recent vintage Serge that

makes

> nice
> > sines that don't seem to buzz.
> > Could this just be a power supply or waveshape adjustment thing?
> >
> > Any opinions or observations?
> >
> > Thx
> >
> > JP
> >