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

[Dan Snazelle]

all the opamps are beng driven by the same bias as the BBD.


what didnt make sense about the schematic? 

there are three two trimmers and a regulator. i have never worked with ANYTHING in my life that is so finicky about BIAS.





> Date: Sat, 12 Sep 2009 18:00:22 -0700
> From: dixon at interchange.ubc.ca
> Subject: RE: [sdiy] help getting VCO levels down to MN32XX BBD size
> To: subjectivity at hotmail.com; guitaricon at verizon.net; synth-diy at dropmix.xs4all.nl
> 
> 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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