Frequency Shifter (was: Re: [sdiy] Electronotes, op-amp substitution, thru-zero BODE???)

[Sean Costello]

Or software! (running on a DSP for a hardware module)

Things like low noise multipliers and through-zero oscillators are trivial
to program in DSP. The phase differencing network is a little more
difficult, but I have published the code for doing a 12th order network in
the Csound source code, and the same technique could be extended to a
digital realization of JH's more complicated network.

Sean Costello

----- Original Message ----- 
From: "karl dalen" <dalenkarl at yahoo.se>
To: "JH." <jhaible at debitel.net>; "phil" <philmacnutt at mac.com>;
<synth-diy at dropmix.xs4all.nl>
Sent: Monday, January 16, 2006 3:41 PM
Subject: SV: Frequency Shifter (was: Re: [sdiy] Electronotes, op-amp
substitution, thru-zero BODE???)


> Or go the FM a delay route!
>
> KD
>
> > > I checked Jurgen's site, and indeed you are right, it is all there,
just
> > too
> > > much of it!  I think I counted like 9 different circuits that I guess
> > would
> > > all have to be transferred to PCB.
> >
> > Really, you don't want a pcb for this. (Unless you plan to put it into
> > production commecially, in which case we should talk about it anyway
8-) )
> >
> > Just do it like I did: Use plenty of Veroboard area and solder the
> > components
> > such that the lay out reflects the topology of the *schematics*. That's
the
> > secret to easy troubleshooting as well.
> >
> > BTW, I don't think you really need a thru-zero VCO for a Frequency
Shifter.
> > It's more important that your VCO can go down to very low frequencies
> > (<0.1 Hz), for these special chorus / infinite phasing effects.
>