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does the mf-103 self oscillate??
Posted: Fri Jul 07, 2006 11:22 pm
by spacefuzzz
i was playing mine today and i had it set on the 12 stage, lfo on kill and the fastest speed. and i heard it oscillate. um, my amp does buzz a little so i dont know if it was just phasing the buzz. does yours do this??
Posted: Sun Jul 09, 2006 4:41 am
by spacefuzzz
i see that theres 85 views on this post and not one can answer my question
Phaser
Posted: Mon Jul 10, 2006 6:51 am
by eric coleridge
It sort of does. It doesn't produce the same kind of sharp sine wave as a LPF would, but when the resonance is all the way up, it starts to get pretty squelchy. So yes, it does oscillate but not anywhere near that of the MF101 for instance. I'm sure you wouldn't be able to play notes with it, but it will make noises (only very quietly if nothings controling it or running through it).
Posted: Mon Jul 10, 2006 10:19 am
by spacefuzzz
yes! so its not broken. ok yeah it does exactly that. a low squelched hum. it sounds cool but i was a little worried. thanks for replying eric!
Posted: Mon Jul 10, 2006 3:00 pm
by swiss_destruction
its not self oscillation. self oscillation is with a filter that hum you here (wich can get pretty high in my opinion, it can go upto about 250 hz wich is about c3 i think but i'm not sure) anyway that hum is because the lfo wich is basicaly a kind of an oscilator just its one with a very low hz rate to be able to function as it is so anyway when you put the rate on 180-250 hz it begins to produce a sound that you are able to hear...anyway this was a bit of a shity explanation but i hope you understood something from it
Posted: Mon Jul 10, 2006 5:06 pm
by spacefuzzz
no i got you. but lets say my zvex fuzz factory, that will oscillate and i dont think it has a filter in there??
Phaser feedback
Posted: Mon Jul 10, 2006 5:22 pm
by eric coleridge
swiss_destruction wrote:its not self oscillation. self oscillation is with a filter that hum you here (wich can get pretty high in my opinion, it can go upto about 250 hz wich is about c3 i think but i'm not sure) anyway that hum is because the lfo wich is basicaly a kind of an oscilator just its one with a very low hz rate to be able to function as it is so anyway when you put the rate on 180-250 hz it begins to produce a sound that you are able to hear...anyway this was a bit of a shity explanation but i hope you understood something from it
It may just be semantics, but I think it is self-oscillation. The Moog Phaser is a filter, a comb filter, with resonance. And when the resonance is turned all the way up, I hear some oscillation (besides or beyond the audiable LFO). You could call it feedback also, but it's just another term for the same thing.
Posted: Mon Jul 10, 2006 7:36 pm
by spacefuzzz
very true eric.
Posted: Mon Jul 10, 2006 8:57 pm
by Impossible Sound
It almost self-oscillates, which makes the MF-103 a good source for woody hand-drum type sounds. With the resonance cranked up all the way, control the sweep with an LFO or sequencer, and put the clock output from the sequencer or a square from another LFO into the input. The same thing can be done on the MF-101 (or any filter) by putting the resonance just shy of self-oscillation.
Posted: Tue Jul 11, 2006 6:55 am
by peter ripa
if u put resonance all the way up and then feeds some extra voltage thru the cvin for resonance it does selfresonate
Posted: Tue Jul 11, 2006 4:46 pm
by Impossible Sound
Awesome! I'll have to try that. I guess I assumed the CV ins couldn't exceed knob position.
Posted: Tue Jul 11, 2006 6:09 pm
by peter ripa
they add up
Posted: Fri Jul 14, 2006 5:12 pm
by Impossible Sound
Been trying out the self-oscillation on the MF-103, and it's very cool. Great metallic tones and plucky percussion goodness. Even weird breathy and throaty tones at some settings.