[sdiy] Electronotes, op-amp substitution, thru-zero BODE???

[Steven Cook]

I've built a hardware frequency shifter and also a VST Plugin. Neither have
through-zero capability (although it would be very easy to add to a software
FS) because IMHO it isn't a very useful feature.

My hardware FS uses a pair of two-stage filters and sounds fine, so I wonder
if large 6-stage filters are really necessary... There is a small amount of
carrier breakthrough, but this is probably as much to do with th fact that I
didn't use any noise reduction, either.

Best Regards,

Steven Cook.

http://www.spcplugins.com/

> From: "phil macnutt" <philmacnutt at mac.com>
> Date: Sat, 14 Jan 2006 17:45:05 -0600
> To: <synth-diy at dropmix.xs4all.nl>
> Subject: [sdiy] Electronotes, op-amp substitution, thru-zero BODE???
> 
> Howdy all,
> I'm rather interested in somehow figuring out a way to build a Bode/Moog
> frequency shifter clone of some sort, but I don't understand the guts of how
> it works.  Is the "thru zero VCO" the basis for this famous module?  Would
> anybody care to comment on the possibility of building one?  I'm not looking
> for an exact clone, but something that has the same basic functionality.
> 
> Ten minutes of googling turns up the following info:
> 
> 1. Encore says they sell one for $389 USD, but 1)an email sent bounced,
> and 2)I'd much rather build one at least from a kit/blank PCB
> 
> 2. On Magnus' website there are links to the Moog schematics, but the
> links are dead.
> 
> 3. Two folks I found on the web have built their own (names withheld
> since I don't personally know them), but no PCBS available.
> 
> 4. Analogue Systems sells one for about $1,400 (USD)
> 
> 
> For me, I guess the ultimate goal here is to somehow wind up with a PCB
> layout and a list of components that are readily available.
> 
> So, any help or advice would be most appreciated.
> 
> Best regards,
> Phil