RG's Walking Ring Counter LFO

Started by idiot savant, February 08, 2006, 09:51:51 PM

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idiot savant

Here's the article:

http://www.geofex.com/Article_Folders/LFOs/psuedorandom.htm

My question has to do with the Ring counter LFO.  Getting stepped and sine waves with just the 2 chips looks quite appealing.

The way it is shown you would have to clock the CD4015 at sixteen times the frequency you want out. correct? twice the number of stages.

so if that is the case, and you want a LFO rate between say .5Hz-10Hz you would have to run the clock at 8Hz-160Hz.

wouldn't this interfere with the audio something fierce? Bleedthrough? ???

am I way off base here or what

R.G.

Quoteso if that is the case, and you want a LFO rate between say .5Hz-10Hz you would have to run the clock at 8Hz-160Hz.
wouldn't this interfere with the audio something fierce? Bleedthrough?
It will certainly interfere if you let it, just as all LFOs will cause interference if you let them. The whole idea in LFOs is to restrict the LFO to NOT bleeding through into the signal path by careful design and layout.

There are many threads about LFOs clicking, causing thumping. or other interference with signal, including the tremolo in all-tube guitar amps.

There is a general principle that the higher the frequency, the smaller the components needed to filter it out, though. Moving the LFO interference frequencies higher makes them easier to kill.

R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.