Fwd: [sdiy] RE: WP20 VCA

[rdrake at data2action.com]

then there's tom's stuff at http://www.ele4music.com/... tomcat, or bassace.  

lbd

>----- ------- Original Message ------- -----
>From: ethan at monsoonmicro.com
>To: synth-diy at dropmix.xs4all.nl
>Sent: Fri, 12 Sep 2003 13:58:30
>
>sorry, i did it again. i'm not used to this yet.
>
>> can anyone recommend any other mini synth
>projects that are fairly 
>> simple for beginners and are finished as far as
>development is 
>> concerned.
>> and please don't say fatman, i'm well aware of
>the paia stuff and am 
>> trying to ignore it.
>>
>> thanks,
>> -et-
>>
>> On Friday, September 12, 2003, at 12:42 PM, Scott
>Gravenhorst wrote:
>>
>>> Is this a contest or a dare or what?  (c:
>>>
>>> Grant Richter <grichter at asapnet.net> wrote:
>>>> Hi Ray,
>>>>
>>>>> I just went and did some breadboarding to see
>what I was thinking 
>>>>> 20 years
>>>>> ago. The answer... not much. At best the
>circuit is very 
>>>>> non-linear. In
>>>>> other words if you start with a triangle wave
>in you get a severely
>>>>> distorted triangle wave out. While
>experimenting I had to double 
>>>>> the gain
>>>>> (200K instead of 100K feedback resistor) so
>that the signal was a 
>>>>> little
>>>>> more above the noise level of the chip. I
>recommend that you find 
>>>>> another
>>>>> VCA circuit. I have a couple of pretty low
>parts count VCAs on my 
>>>>> site but
>>>>> the WP20 stuff was the misguided effort of a
>much younger and not 
>>>>> very
>>>>> electronically savvy man (me). I can't even
>remember if I had an
>>>>> oscilloscope back then.
>>>>
>>>> Somebody used the term "anti-synth" a while
>back. That go me 
>>>> thinking about
>>>> a synth deliberately designed from nasty,
>distorted, non-conforming 
>>>> and
>>>> imperfect modules. (kind of like a PAIA Gnome,
>only deliberately 
>>>> this time,
>>>> just razzing you John!!!)
>>>>
>>>> So let's call this circuit, part of the
>"anti-synth" collection. 
>>>> <grin> I
>>>> found a VC waveshaper that sounds like a train
>wreck (not 
>>>> literally), I will
>>>> post an "anti-synth" design at some point.
>>>>
>>>> Like that CA3096 based VCO with 10K of DeFranco
>compensation. While 
>>>> still a
>>>> VCO, it has the most waveform shift with
>frequency. Bad in the 
>>>> traditional
>>>> sense, but a design win for an "anti-synth".
>>>>
>>>> No offense intended here. The brilliant people
>on this list who are
>>>> dedicated to producing ever improved designs,
>have my complete 
>>>> admiration.
>>>> But it is kind of fun to reverse your
>perspective, and see how BAD 
>>>> you can
>>>> design, while still making a module function.
>>>>
>>>
>>>
>>> - Where merit is not rewarded, excellence fades.
>
>>> - Hydrogen is pointless without solar.
>>> - What good are laws that only lawyers
>understand?
>>> - The media's credibility should always be
>questioned.
>>> - Governments do nothing well, save collect
>taxes.
>>>
>>> -- Scott Gravenhorst | LegoManiac / Lego Trains
>/ RIS 1.5
>>> -- Linux Rex	 | RedWebMail by RedStarWare
>
>>> -- FatMan: home1.gte.net/res0658s/FatMan/
>>> -- NonFatMan:
>home1.gte.net/res0658s/electronics/
>>>
>>>
>>>
>>
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