[sdiy] Really Low, LFO

[Tim Parkhurst]

On Fri, Apr 2, 2010 at 1:51 PM, Kyle Stephens <lightburnx at yahoo.com> wrote:
> Can anyone point me to some reading material on infrasonic oscillator design? I want to build a really low, low LFO, with a period of around half an hour (yes, _that_ slow!).
>

Hey Kyle,

How about dividing a square wave waaaaaay down? You can use a variety
of oscillator designs, of course, and you could use an integrator
(with a big honking cap) to smooth the square out. Alternately, you
could possibly use an R/2R converter and sum several divided down
squares (higher freq's get attenuated more) to get a pretty fair
approximation of a slow triangle wave (still might require a smoothing
cap).


Tim (or a pretty fair approximation thereof) Servo
-- 
"Sire, the church of God is an anvil that has worn out many hammers."
- H.L. Hastings