[sdiy] LFO with variable waveshaping

[Theo]

Check with the korg MS20 LFO for the basic principle, see Marjan Urekars
website for a good drawing.

Using diodes instead of the FETs also works, but FET or CMOS switches works
better.
Replace the shape pot with LDR, done...

The schematic is very easy to modify with CV speed control too, no OTA
needed :)
CV to one FET/switch, inverse CV to the other.

BTW There are other ways to Rome too, but this one is quite straight
forward.

Theo



From: Luis Marka <lmarka at yahoo.com>


> Hi DIY,
> I am thinking about building a LFO with waveshaping. It would be
> something like this:
>
> Waveshape CV @ 0V:
> |\        |\        |\
> |  \      |  \      |  \
> |    \    |    \    |
> |      \  |      \  |
> |        \|        \|
>
> Waveshape CV @ 5V:
>     /\        /\
>    /  \      /  \
>   /    \    /    \
>  /      \  /      \  /
> /        \/        \/
>
> ...and @10V:
>         /|        /|
>       /  |      /  |
>     /    |    /    |
>   /      |  /      |  /
> /        |/        |/
>
>
> (Please use a non-proportional font in order to appreciate the beauty
> of this fine piece of ASCII art).
> Any ideas on how to implement such an LFO?? I don't recall seeing
> anything like this before...
>
> All my best,
> Luis Marka
>
>
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