[sdiy] sq2saw

[harrybissell at prodigy.net]

Jonathan asked...

>Hello!
>Where can I find an usable(without amplitude troubles)square to saw converter?

Uhhh.... In Heaven ??  (or Oz, or Never-Never Land...) ;^P

That said... lets get it on.

Do you know anything more than the square wave ? (can you accurately
predict the frequency, etc ?)

Is it a perfect square wave ?

Could you get the square wave at a different frequency (like much higher)

>From your sig line... I'm presuming you are using a theremin to
get your waves (stop me if I'm wrong)

One way is to use a much higher frequency... then use a digital divider
to make a staircase wave (summing resistors).  The more you divide..
the better the staircase gets.

Another way is pitct to voltage conversion, then run a sawtooth oscillator.  I do this with my PV-1 (shameless plug) which is based on
the Etherwave Theremin Pitch to Voltage converter by Bob Moog - used with permission. There might still be some boards available at EFM.
This will track your square wave at a latency of 2 cycles...and output
a stable voltage that could drive a saw VCO.

If you ARE using a Theremin... you cannot get a step change in frequency... so a converter than can make small adjustments to a
derived sawtooth might be possible.

How much amplitude error can you tolerate ?

over...

H^) harry


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