Mono in- stereo out auto panner build suggestions

[njkmonty]

Can anyone suggest a build for a
Mono in stereo out auto panner?
I don't need isolated outputs etc

I'm assuming it's lfo driven?
After that Leslie effect but instead of rotating speakers
Having the sound fade into 1 speaker while fading out of another

Has anyone built something like this?

[snap]

manual: http://www.geofex.com/Article_Folders/panner.pdf
LFO: http://www.geofex.com/Article_Folders/VCA%20Applications.pdf  (App.4)

[blackieNYC]

I would suggest the cardinal tremolo LFO. As it is here, two LEDs are inverted in turning on and off, and they drive two series LDRs.  Use this LFO, but the audio section of the cardinal is not exactly what you want.  It filters and recombined to mono.  Use the tremulus lune schematic for the audio path, just as it is - twice.
The cardinal, for the LFO
http://www.diystompboxes.com/smfforum/index.php?topic=110779.msg1017347#msg1017347

[GibsonGM]

How about this?  Panning by envelope.  Good stuff in here:  http://moosapotamus.net/files/stompboxology-envelope-effects.pdf

[njkmonty]

like this?
can i use VTL5C1 (i have heaps of them)   the Cardinal uses them , but the Tremulus uses VTL5C2

[blackieNYC]

Yes.  Just like that.  Either vactrol will probably work well.  One might be slower than the other, one might be a little less quiet at the low swing of the LFO, and one might have a higher resistance, in which case you simply adjust your 50k trim for unity gain.  It will be fine.
What you have shown is true stereo in and out, which is very cool. For flexibility's sake - keep it that way, and put a Y cable on the inputs, or a switch combining the two inputs into one.  This may require a buffer or at least an active pedal in front.  Another possibility is, having a switch that moves the input side of the 2nd LDR/vactrol resistor to the same point as the input to the first LDR.  That seems simple. The first op amp should make a good buffer to drive both vactrols. The other would be unused.
Stick with the cardinal LFO exactly.
Now you can build some other stereo thing to put in front.  Or (I've done this, it's awesome) use the thing to sweep between two different fuzzes, or eqs, and recombine to mono.  Play with the depth a little. You've got this morphing fuzz sound, or a fake univibe/cardinal kind of thing. Build a simple mixer, 2channels, don't really need level controls on it at all.

[digi2t]

Now you can build some other stereo thing to put in front.  Or (I've done this, it's awesome) use the thing to sweep between two different fuzzes, or eqs, and recombine to mono.  Play with the depth a little. You've got this morphing fuzz sound, or a fake univibe/cardinal kind of thing. Build a simple mixer, 2channels, don't really need level controls on it at all.

Build a Stereo Panneur. It's two Lunes side by side. You can sync or split them, trem, or pan. Stereo in as well, so you can do some crazy stuff like blackie points out. My fav is running the trem stereo out, but having each side set to different speeds. Mucho psychadelio.

[Transmogrifox]

You can do this with something as simple as an EA tremolo.  All you need to do is put a second pot on the output to blend the  input signal with the output signal on an EA.  Probably a trim pot that you adjust to your liking and leave it alone, "set and forget". The out-of-phase tremolo signal coming off the EA will cancel the in-phase input, and create a complementary signal for the right channel.  It could be improved by buffering both outputs so the relative panning is load independent.

The panning width is set by the tremolo depth control.

[njkmonty]

i do have some stereo pedals, (still trying to get a/da flanger clone stereo outputs to work too!)

Build a Stereo Panneur

do you mean just build 2  tremulus lunes?
or Build the 4ms Stereo Panneur? i had a quick look and i thought you have to buy the pedal?
is there a "Stereo Panneur " schematic.

[blackieNYC]

I must say I prefer that buffered output of the cardinal's LFO. At any depth, the led is fully on and dipping downward in dimness.  The others I believe must fluctuate around a point halfway between the maximum resistance and the minimum resistance of the LDR, causing a little gain loss.  At the risk of having rotten fruit thrown at me, Boss adds this buffer, and their stereo tremolo is truly hard to beat.
Midwayfair, where are you?  My fruit umbrella is collapsing under the barrage!

[digi2t]

i do have some stereo pedals, (still trying to get a/da flanger clone stereo outputs to work too!)

Build a Stereo Panneur

do you mean just build 2  tremulus lunes?
or Build the 4ms Stereo Panneur? i had a quick look and i thought you have to buy the pedal?
is there a "Stereo Panneur " schematic.

Essentially, the Panneur is two Lunes, with Sync/Unsync, and Trem/Pan toggle switches between the two. You can either sync the two Lune's together (or not, very cool), and use the Lune's as inividual trems, or pan between the two.

I built the kit from 4ms. For 145 clams, you get everything. if you're gung-ho to diy it all, all the documantation is here, including some nice add-on mods;

http://www.commonsound.com/kits/doku.php?id=commonsound:panneur

[njkmonty]

cheers!

[Kevin Mitchell]

Interesting topic. Just last night I felt the need to research the same thing pretty much! My thought was to use R.G.'s Panning For Fun -panning between outputs and replacing the pot with an(well 2) LDRs to a custom lfo using alternating pulsing LEDs (to act as an automatic voltage divider) and eventually adding in a LERA-like effect (double ramping?).

This is something I plan on bread boarding some time this week. Please excuse my novice strategy  Should be a fun little project.