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

Sun Sep 13 06:48:09 CEST 2009

that is a super duper idea

thanks
(as dan moves to the bench to test it out!)

--------------------------------------------
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

----------------------------------------
> Date: Sat, 12 Sep 2009 21:29:49 -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
>
> OK, Dan, I don't profess to understand this circuit (I haven't tried using
> BBDs or PLLs yet), but I think I can offer some advice about your finicky
> bias:
>
> Don't try to set a bias by putting a trimmer between two rails. Pretend you
> can get the exact voltage you want with a divider (i.e., two specific
> resistors), build that divider, and then put a small-value trimmer in
> between. Then the trimmer won't be too touchy.
>
> For example, if you need 5.2V and your rails are 9V and 0V, then you need
> two resistors in a ratio of 3.8/5.2. 22k/30k would work nicely. Then, put
> a 2k trimmer in between and take your bias from the tap. The trimmer will
> now have a range of 5V to 5.33V. If it's a multi-turn trimmer, then you
> should be able to find your magic bias point easily.
>
>
>> for further refrence you could look at the MN3207 zombie chorus
>>
>>
>> http://www.synthdiy.com/files/2007/zombie_chorus_mn3207_based.jpg
>> --------------------------------------------
>> 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
>>
>>
>>
>>
>>
>>
>> ----------------------------------------
>>> 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
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Synth-diy mailing list
>>>>>> Synth-diy at dropmix.xs4all.nl
>>>>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>>>
>>>>> _______________________________________________
>>>>> Synth-diy mailing list
>>>>> Synth-diy at dropmix.xs4all.nl
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>>>>
>>>> _______________________________________________
>>>> Synth-diy mailing list
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>>>
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