[sdiy] Really Low, LFO

[Ian Fritz]

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?)
>
>
>
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