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2HP module to make an LFO unipolar?
MUFF WIGGLER Forum Index -> Eurorack Modules  
Author 2HP module to make an LFO unipolar?
R.U.Nuts
So, often times I wish my LFOs were outputting 0-10V unipolar signals instead of -5/+5V signals. I only have very limited space left in my rack. So is there a module with 2HP width that can mix an LFO signal with a 5V offset or fullwave-rectify an LFO signal? DIY kit is fine. I think this might be also a chance to make my first fully DIY module. So tips about rolling your own are also welcome.
js213
If you can afford 1 more hp, Erica's Pico Scale offers +/-5v offset

https://www.modulargrid.net/e/erica-synths-pico-scale
lohacker
In 4 hp I'm using the good old 8nu8r exactly for this purpose. In 2 hp I've seen the Soulsby Uni-Five (it converts to 0-5v tho) but haven't direct experience with it.
The Junglechrist
https://www.modulargrid.net/e/cfm-bhwr-rectifier ???
defenestration
not much options for this in 2hp - circuit abbey invy is a fantastic 4hp design, 2 channels of polarization/offset and the outputs mix. it also can amplify signals, which is super useful in a 'set and forget' type of utility module situation, but it can make it a bit fiddly for fine control when highly attenuating voltages
euromorcego
i am sure 2hp have an attenuverter/offset. And there is also this one here: https://www.modulargrid.net/e/other-unknown-soulsby-uni-five meant to convert bipolar lfos to use with arduino-based 0-5V inputs.
R.U.Nuts
The Junglechrist wrote:
https://www.modulargrid.net/e/cfm-bhwr-rectifier ???


Yeah, I know this one but it does only halfwave rectification...
R.U.Nuts
js213 wrote:
If you can afford 1 more hp, Erica's Pico Scale offers +/-5v offset

https://www.modulargrid.net/e/erica-synths-pico-scale


That could do it. Since I have a DIY case I might be able to squeeze in one more HP with a little work.
KSS
Some new modules to solve this announcing next week. All 2HP. Most less than

Do you have a preferred dealer?

Edit:
Original threadhttps://www.muffwiggler.com/forum/viewtopic.php?t=178163&postday s=0&postorder=asc&start=50
Navs
If you can DIY and the LFO in question is analogue, making it unipolar probably would not involve more than one resistor.
R.U.Nuts
KSS wrote:
Some new modules to solve this announcing next week. All 2HP. Most less than

Do you have a preferred dealer?

Edit:
Original threadhttps://www.muffwiggler.com/forum/viewtopic.php?t=178163&postday s=0&postorder=asc&start=50


Well, cool... From 2HP? Fav. dealer: Schneider's...
R.U.Nuts
Navs wrote:
If you can DIY and the LFO in question is analogue, making it unipolar probably would not involve more than one resistor.


It's an MFB dual LFO. I guess it's analogue. I DIYed kits and made some passive utility stuff myself but never hacked a module. But if it's only about one resistor I'd be curious how to do that...
KSS
R.U.Nuts wrote:
Well, cool... From 2HP?

Not TwoHP,com company. 2HP size.
Navs
R.U.Nuts wrote:
Navs wrote:
If you can DIY and the LFO in question is analogue, making it unipolar probably would not involve more than one resistor.


It's an MFB dual LFO. I guess it's analogue. I DIYed kits and made some passive utility stuff myself but never hacked a module. But if it's only about one resistor I'd be curious how to do that...


The idea is to add the offset at the output buffer/opamp. Have a look at the pictures. I've simplified it, of course, as it would take a few more resisitors or a trimmer to get the necessary -5V, or whatever it takes to shift the LFO, but you get the idea. Depending on the design of the LFO it may be even simpler, e.g. if the LFO is actually unipolar but is offset to be bipolar at the output. Then all you'd need to do is remove the offset.





FWIW I'm finding more use for unipolar LFOs these days too ... hmmm.....
R.U.Nuts
Actually I can't see any advantage of LFOs being bipolar -besides maybe audio range applications. Thanks for your effort!
Blingley
One example where being bipolar is useful is vibrato. Especially if you have vibrato depth controlled by VCA, you do not want your synth patch going wildly out of tune. Stereo panning is another, and ringmodding two bipolar LFOs together is more fun than two unipolar ones.
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