[sdiy] Through-Zero FM

[Grant Richter]

One thing through zero FM is good for is quadrature oscillators. When used
for quad panning a through zero quadrature osc. will reverse panning
direction when the control voltage goes from positive through zero to
negative.

In other words the sound spins in one direction, slows, stops then spins in
the other direction. Nice.

> From: Tim Parkhurst <tparkhurst at siliconbandwidth.com>
> Date: Thu, 16 Dec 2004 15:31:21 -0800
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Through-Zero FM
> 
> So I'm looking at JH's site (looking for a picture where someone had made a
> nifty little PCB for use with SMT tempcos... I thought it was JH), and I see
> he has several VCOs with "Thru-Zero" FM capability. I've seen this term
> bandied about before (especially with respect to frequency shifters), but
> I've got to admit I don't really understand what it is or why it would be
> useful. Anyone care to enlighten me?
> 
> 
> Tim (not afraid to ask the really stupid questions) Servo
> 
> "Epoxy always has the right 'thread' " - Toby Paddock
> 
> 
> 
> BTW - also got an email from Jay saying that he wanted to make good on the
> tempco order. This is excellent news.
> 
> 
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> 
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