[sdiy] Really Low, LFO

[Greg James]

Here you go: http://www.synthtech.com/motm320.html


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Kyle Stephens
Sent: Friday, April 02, 2010 4:52 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] Really Low, LFO

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