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

[harrybissell]

I see you like your projects BIG...

Yes, you need a thru-zero VCO, and some phase splitting filters
(that are not simple) and a couple of good multipliers.

I believe everything can be found at Jurgen Haible's site.

He likes his projects BIG, too...   :^P

H^) harry  (who likes his projects BIG too... but does not need freq
shifting
THAT bad... :^)

phil macnutt wrote:
> 
> 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
> 
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Dave Kendall
> Sent: Saturday, January 14, 2006 6:41 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Electronotes, op-amp substitution, thru-zero
> oscillator...
> 
> >> i'm also looking at the thru-zero VCO... pretty complex project,
> >> but i'll never be buying one from cyndustries... any of you
> >> oldtimers ever build one of these beasts?
> 
> I found this. Doesn't look too complicated......
> 
> <http://www.edn.com/article/CA341451.html>
> 
> Cheers,
> 
> Dave