[sdiy] best soundign vco design?

[Scott Gravenhorst]

Peter Grenader <peter at buzzclick-music.com> wrote:
>My vote:  stick to triangle core. Harder to find as far as schematics
>floating around the web,  but it's worth the hunt.

One easy place to start is the LM13600 or LM13700 triangle VCO.  Simple
and single chip core.  The schematic is in the datasheet which can be
found on the web.  All one needs to add is a proper V-I converter for it
since the one they show, just a resistor, sucks greatly, even for linear
applications.  This VCO also provides a square output as well as the
triangle.

>
>Scott Gravenhorst wrote:
>
>> =?iso-8859-1?q?Milo=20Barrowclough?= <delta_316 at yahoo.co.uk> wrote:
>>> Content-Transfer-Encoding: 8bit
>>> 
>>> hi everyone
>>> 
>>> i'm trying to find a vco schematic to build. I want to build a
>>> vco that has a plastic, artificial sound. a sound that is pure,
>>> strong and unashamedly aritifical. like a sonic equivalent of a
>>> loveheart sweet. i've been considering the asm-1 design. would
>>> this have the full-on pure fatness of analogue? also i would
>>> prefer if the design used easy-to-find components. maybe a
>>> minimoog vco? or octave cat?
>> 
>> Well, the ASM-1 _is_ analogue, so I would guess that it has analogue
>> fatness.  Waveshape is what determines the timbre, the ASM-1 is a
>> sawtooth.  I'm not real sure how much different one sawtooth sounds
>> from another.  For me, I like to have a selection of waveforms, saw,
>> tri, square, pulse and sine are the most common.  The ASM-1 is highly
>> rated, has a wide range, accurate tracking and is simple.  From the
>> saw it is easy to derive square and pulse or pulse width modulated.
>> 
>> ---------------------------------------------------------
>> - Where merit is not rewarded, excellence fades.
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>> - What good are laws that only lawyers understand?
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>> 
>> -- 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/
>> -- Autodidactic Master of Arcane and Hidden Knowledge.
>> 
>

---------------------------------------------------------
- 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.
- The only good terrorist is a dead terrorist.
- 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/
-- Autodidactic Master of Arcane and Hidden Knowledge.