[sdiy] Really Low, LFO

[Kyle Stephens]

Herr Schmitz, immer fantastisch, nicht Wahr? (ie: Rene rocks!)

Thanks Ian!


_Kyle

--- On Fri, 4/2/10, Ian Fritz <ijfritz at comcast.net> wrote:

> From: Ian Fritz <ijfritz at comcast.net>
> Subject: Re: [sdiy] Really Low, LFO
> To: "Kyle Stephens" <lightburnx at yahoo.com>, synth-diy at dropmix.xs4all.nl
> Date: Friday, April 2, 2010, 2:13 PM
> Rene's VCOs take on that problem.
> VCO3 goes down to 15 min as is and could probably be
> extended by changing a 
> cap.
> http://www.uni-bonn.de/~uzs159/index.html
> http://www.uni-bonn.de/~uzs159/index.html
> 
> Ian
> 
> 
> At 02:51 PM 4/2/2010, Kyle Stephens 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!).
> >
> >As HF designs have their share of issues that get worse
> in that spectrum, 
> >infrasonic has its problems too I would imagine - I
> just don't know what 
> >exactly they might be.
> >
> >For my app, accuracy isn't as important as
> precision/repeatability, though 
> >if both are possible then both are welcome.
> >
> >Closest I've found so far is this:
> >
> >http://tinyurl.com/yf9wzp3
> >
> >I reckon I can tailor it if I make the integrator cap
> several decades 
> >larger, to shift that 0.1Hz to 100KHz range several
> decimal places downward.
> >
> >I've a copy of AD's Nonlinear Circuits Handbook, which
> has some material 
> >on the topic, though nothing too specific on freqs
> beneath 1 Hz (half an 
> >hour is ~ 0.0001 Hz).
> >
> >I spoke to Prof. Lanterman about this a while back, and
> he recommended a 
> >microcontroller based solution, and while that's
> something I want to break 
> >into, it's a whole 'nother can of worms too. If this
> can be done in 
> >analog, it'd be a cool achievement and an enrichment
> exercise if nothing 
> >else... :]
> >
> >
> >
> >_Kyle (so slow it Herz?)
> >
> >
> >
> >_______________________________________________
> >Synth-diy mailing list
> >Synth-diy at dropmix.xs4all.nl
> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
>