[sdiy] Searching for a VC Clock schematic ......

[Scott Gravenhorst]

If what you want is a clock where the frequency is controlled by a voltage,
then what you need is a VCO with a level shifter and driver.  I have one on
my site, but I the VCO I used is a linear pitch CV type, not expo.  The top
row of parts in the schematic is the linear voltage to current converter. 
For expo, this needs to be replaced with you favorite variety of exponential
voltage to current converter.  (I don't use expo).

http://home1.gte.net/res0658s/fatman/vcngvco.html

The VCO part is just the datasheet triangle VCO.  The square output from the
VCO goes above and below ground, so I put it through a diode and then a
transistor to amplify it, then to a CMOS inverter gate as a final buffer. 
>From there it can clock whatever I want.


megaohm <megaohm1 at gmail.com> wrote:
>Content-Transfer-Encoding: quoted-printable
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>
>Why not the 4036? I haven't tried it. Is it not stable enough or something?
>You can VC a 40106 oscillator using a vactrol for the feedback resistor.
>Drawback is the lag time of the vactrol. I made a bank of six and used one
>as a clock for awhile. Here's a pic with links to the sources:
>
>http://home.comcast.net/~peng5002/modules/sixsquarespage.htm
>
>
>Ray Wilson's musicfromouterspace site has some circuits that use a 40106
>clock. I don't remember if they're VC-able.
>
>peng
>

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