[sdiy] help getting VCO levels down to MN32XX BBD size

[David G. Dixon]

All Ken Stone's module does to the synth level output is attenuate it by a
factor of 22 across a divider and send it to the effect, and then re-amplify
the signal from the effect by the same factor in a non-inverting opamp and
send it back into the synth.  There are some ac coupling capacitors and a
few other bells and whistles, but basically its pretty simple.  I don't know
why this wouldn't work for what you want to do.

Also, I don't understand what you mean by "adding the proper bias".  What is
this bias, and why do you need to add it?  Does the flanger output have a dc
component (i.e., is it not centred about 0V)?  Granted, I couldn't make
heads or tails out of your "back o' the napkin" schematic, so there's
probably something I'm missing.


> not sure if that will work stock as that is for using LINE with an effects
> chain. (i think that is why there is a 1m to ground)
> 
> that is not my intention.
> 
> i want to solder this up as a module for my modular
> 
> 
> also, I am interested in how I need to modify any filtering for a line
> level.
> 
> the main issues i have had so far with trying to use a simple neg gain and
> offset opamp is that unless I add the proper Bias, it does not seem to
> work with the rest of the circuit.
> 
> maybe I need to just keep trying things!
> 
> thanks
> 
> 
> 
> ----------------------------------------
> > From: guitaricon at verizon.net
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: Re: [sdiy] help getting VCO levels down to MN32XX BBD size
> > Date: Sat, 12 Sep 2009 19:41:24 -0400
> >
> > Ken Stone's Stomp Box Adapter?
> >
> > http://www.cgs.synth.net/modules/cgs60_sba.html
> >
> >
> >
> > ----- Original Message -----
> > From: "Dan Snazelle"
> > To:
> > Sent: Saturday, September 12, 2009 7:19 PM
> > Subject: [sdiy] help getting VCO levels down to MN32XX BBD size
> >
> >
> >>
> >>
> >>
> >> i got a very basic flanger working
> >>
> >> http://electro-music.com/forum/phpbb-
> files/snazzy_simple_test_flanger_162.jpg
> >>
> >> however it only works with Guitar signals
> >>
> >> In order to get it to work with +/- 10 volts and +/- 5volt signals,
> what
> >> can I add to the front end??
> >>
> >> in most cases I would just level shift, etc But this signal needs to be
> >> TINY (lets say .50 volts peak to peak)
> >>
> >> so far I cant find anyone that does this without a compander.
> >>
> >> any ideas, schematics or links appreciated
> >>
> >>
> >> thanks so much
> >>
> >>
> >>
> >> --------------------------------------------
> >> check out various dan music at:
> >>
> >> http://www.myspace.com/lossnyc
> >>
> >> (updated monthly)
> >>
> >> http://www.soundclick.com/lossnyc.htm
> >>
> >>
> >>
> >> http://www.indie911.com/dan-snazelle
> >>
> >> (or for techno) http://www.myspace.com/snazelle
> >>
> >> ALSO check out Dan synth/Fx projects:
> >>
> >> AUDIO ARK:
> >>
> >> www.youtube.com/watch?v=TJRpvaOcUic
> >>
> >> www.youtube.com/watch?v=BqIa_lXQNTA&feature=channel_page
> >>
> >> www.youtube.com/watch?v=V4nJPjGgOcU&feature=channel_page
> >>
> >> and soundtrack/design work:
> >>
> >> NEW: check out Dan's sound design from the 1998 award winning film
> SAFARI
> >> by catherine chalmers
> >>
> >> http://www.catherinechalmers.com/videos.cfm
> >>
> >>
> >>
> >> _______________________________________________
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> >
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