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Other LFOs nearly as slow as the uLFO?
MUFF WIGGLER Forum Index -> Eurorack Modules  
Author Other LFOs nearly as slow as the uLFO?
sonicwarrior
Are there other LFOs which can be nearly as slow as the uLFO?
woodteeth
you can put a negative voltage to the rise and fall of channel 1 or 4 of MATHS and that is suuuuper slow.
tortug
Vulcan with negative CV applied, 46 minutes or so...

http://wiki.muffwiggler.com/wiki/Vulcan_Modulator
syncretism
If you get the Mattson VC DLFO kit and stick a Euro faceplate on it, you'll have:

George Mattson wrote:

Min Cycle time at -5V CV= 2.5 hours.

Max is 1.416 Khz. That's the top end, it won't go faster.
vozs
sonicwarrior wrote:
Are there other LFOs which can be nearly as slow as the uLFO?


Trow a 1000uF cap across original charge cap and it will take weeks until it
changes direction. But the question are, do you have the time to wait?
zombie
sonicwarrior
Wow, that was fast. eek! we're not worthy
vozs
It's dead cheap to! And you can do that on any module that charges a cap up and down. LFO, EG, SLEW etc.
amphonic
The VILFO is 4-5 minutes. I tested it with larger caps but I could not think of a reason for a 2 hour cycle.
paults
The E350 will run 1 cycle in about 14 minute, and you don't have to apply anything.

And it's repeatable within 25uS It's peanut butter jelly time!
KNYST
that
tortug wrote:
Vulcan with negative CV applied, 46 minutes or so...

http://wiki.muffwiggler.com/wiki/Vulcan_Modulator


Have tried it, but didn't realise you could go that slow - cool!
I obviously have to hit it again...
Jason Brock
vozs wrote:
Trow a 1000uF cap across original charge cap and it will take weeks until it
changes direction. But the question are, do you have the time to wait?
zombie


I've just started my LFO cycle....NOW!
I'll post again once the cycle completes.
Dead Banana
paults
I suspect that if it uses a basic integrator (cap in the feedback of op amp), that the internal leakage of the cap (plus any input bias current of the op amp) may result in the cycle:

a) never completing at all
b) maybe doing it once but then the op amp "freezes" because you exceeded common mode

If it's a digital oscillator, then it depends on how the look-up table is mapped to the divider, and if the sample rate is constant or dropped because the length of the divider register is limited.

Pesky real-world electronic getting in the way, etc. Dead Banana
Low-Gain
amphonic wrote:
The VILFO is 4-5 minutes. I tested it with larger caps but I could not think of a reason for a 2 hour cycle.



i think of reasons for doing up to a 1hour cycle..
if you're doing simple drone sets live... by having a sine/triangle wave modulate something such as a piston honda's wave tables (which cross fade from wave form to wave form) you can easily have your drone self evolve over that 1hr set time.

This was why i purchased my uLFO. smile If i buy your LFO i'd probably consider tossing a switch in to go between duty range.

I like me some slow LFO's.
mildheadwound
Not euro, but the Sherman filterbank 2 has an lfo that can go one every half hour or so. Maybe it's an hour. Ha! 'Never had the patience to actually time it.
sonicwarrior
amphonic wrote:
The VILFO is 4-5 minutes.


No offense meant, but I don't like the design, especially the knobs.
theabsent
Slow LFOs are my weapon of choice nowadays. IMO uLFO is by far the best euro module to do it (at the moment and without modding). It's really super. I'd get more if they'd be a bit cheaper and smaller.
vozs
[quote="paults"]
Quote:
I suspect that if it uses a basic integrator (cap in the feedback of op amp), that the internal leakage of the cap (plus any input bias current of the op amp) may result in the cycle:
a) never completing at all
b) maybe doing it once but then the op amp "freezes" because you exceeded common mode

Can happen yes, use buffer design instead, but point was, are
cycles longer then 1 hour useful? Weekly cycles? Hardly no.

OK, long time applications like phasing for 10 minutes could be nice.
Ha, can you hear that? w00t But when time becomes to long the
brain adjust it self to mask them out.
Pesky real-world biobrainmechanics getting in the way. Rockin' Banana!
GeoffC
So - did it finish the cycle yet? eek!
Jason Brock
GeoffC wrote:
So - did it finish the cycle yet? eek!


Sorry, I was just kidding. twisted
GeoffC
Dang! I was imagining this post in like two more days that the first cycle had completed ....
hangar
To bring a really old post back to life,
the DUALFO from CESYG has 2 x 90min lfo's

Main Oscillator
Frequency range: Approx. 200uHz (approx. 90 minutes) to 45Hz Outputs

Waveforms: Three phase-related sinewaves at 0°, 120°, 240°
Level: 10Vp-p output centered about 0V (typ. +/-5V)
Impedance: 1kOhm

Auxiliary Oscillator
Frequency range: Approx. 200uHz (approx. 90 minutes) to 45Hz Output

Waveforms: Triangle, sine, both variable shape
Level: 10Vp-p output centered about 0V (typ. +/-5V)
Impedance: 1kOhm

but with a depth of 128.40mm, it doesn't really fit the average eurorack
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