[sdiy] Really Low, LFO

[Veronica Merryfield]

Kyle,

Can I ask what you intend doing with such a beast. 

Veronica

On 2010-04-02, at 1:51 PM, 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?)
> 
> 
> 
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