control voltage generator - which circuits have this

[widdly]

For the adventurous, I will note that any of the 391x chips (3914, 3915, 3916) used for bar graphs and such can be adapted to "quantize" a continuous control voltage produced by hand or other movements into discrete steps.  The bar-graph chip reads the CV input as if it were a signal, and provides outputs from the appropriate pin as if it were illuminating an LED to indicate that signal-level range.  Those quantized outputs can also be used to do things like switch devices electronically with a CD4016/4066/4053, etc.

That's an interesting idea.  Might be handy in a modular synth.  You could make a CV driven step sequencer and feed it different LFO signals for different sequences.

You could probably make a bit crusher out of one of those too.

[The Tone God]

Yeah, I think I got it. I can take out the jacks and put a switch instead, making it in an all-in-one-box.

Correct. The jacks were for a foot controller which you are not using. Ground is a connection. You can't just ignore it. Yeah I know that means you have to with the more complex 3-pole but thats the deal.

ADDED LATER: What would be a good opto for the invisible touch + wah? I was thinking of using the wah board on that nelson's sequencer pdf thing.... perhaps the VTL5C3?

I have no idea. Check the specs. I roll my own optos and configure them for the application needed so I don't have much experience with commercial optocouplers.

Andrew

[DWBH]

ADDED LATER: What would be a good opto for the invisible touch + wah? I was thinking of using the wah board on that nelson's sequencer pdf thing.... perhaps the VTL5C3?

I have no idea. Check the specs. I roll my own optos and configure them for the application needed so I don't have much experience with commercial optocouplers.

Andrew

What should I look for?

[The Tone God]

Well usually I go by what the original control called for. 500K pot I try to get a 500K dark opto. With my circuit I put in a bunch of controls to help deal with the range of optos but they can only go so far to compensate.

Andrew

[Jaicen_solo]

If you need to alter the resistance taper of an opto, would parallel resistors help?

Also, you can look at using a transistor after the LDR to scale the voltages, which is a pretty neat solution as it means you can just get one type of LDR which is known to respond well to the control range of your controller, and use it in a number of different projects without worrying about the resistance values.

[DWBH]

Parts ordered! I'm going to use wah board+filter add on that's on nelson's pdf.

I'm so excited! 

[DWBH]

So, my parts haven't arrived yet, but I'm already thinking about mods and add-ons.
I was thinking of addind a boost in front of it, so that I can tell my friends it's almost a Zvex Wah probe. No, really it's to add some more gain to the wah itself, to give it some more juice, some crackle. Thought of the SHO, the mosfet boost, but all those have mosfets, fets, whatever. I was thinking of a boost with a more common tranny. What do you guys advise me to look at?

EDIT: I must mention that some of these circuits here are also an option: http://www.geocities.com/tpe123/folkurban/fuzz/snippets.html

[DWBH]

After a few days without looking at this, today I found myself doing this picture, because I didn't know how to wire these things, yet.



Is this correct? (i'm pretty sure that's not, but I didn't know how to connect these things.)

[DWBH]

bump

[~arph]

in short: No

The output poles of the R'n C should not be connected together. they replace a pot. A pot always has at least two connections (2 pole version) and sometimes three (therefore the 3 pole version). In the two pole version it's a variable resistance and in the three pole it's a voltage divider. I don't know what that pcb is you're connecting to, but I can tell you that if that pad you are trying to connect to needs a varying voltage that you probably  need to use the two pole version of the R'nC and hook up one pole to Vc (or GND) and the other to the pole on the pcb.

[DWBH]

The pcb I posted there is the Invisible Touch, from topopiccione.
The pad is a CV out - so it needs varying voltage.

Can't I use the Rock n' control (3pole) with the Invisible touch, then?

[theblackman]

what you need to do is make the 2 pole rock'n'control and connect the output from the invisible touch to one pole and the ground from the invisible touch to the other pole.

[DWBH]

Cool.
Got it.

But if i need to use the 3pole version, I can't do it with the invisible touch, then....

Do you guys know of more circuits like this Invisible Touch?

[theblackman]

sorry my knowledge isn't that great, you may be able to do it with the 3 pole but i don't know how to at present.

[DWBH]

So, I received my parts yesterday.

I bought a CD4049U - in the site description, it says that it is unbuffered - I think that's what the U stands for...

So, is there any problem in being unbuffered? Do I need a buffer?

[DWBH]

So, I received my parts yesterday.

I bought a CD4049U - in the site description, it says that it is unbuffered - I think that's what the U stands for...

So, is there any problem in being unbuffered? Do I need a buffer?

bump

[widdly]

That circuit is all the wrong way around. 

The CV out of Invisible touch should replace the pot and power connection stuff on the RIGHT hand side of the Rack 'n' control.  Something like CV Out -> trim ->  LED -> Resistor -> Ground.

When you wobble your foot over the Invisible touch it generates a voltage at the CV out point.  This voltage should then drive the LED in the Rack'n' control.  The LED causes the photocell resistance to change.

The left hand side connections then connect to where the pot in your effects circuit would have connected.  Two or Three wire circuit should work.

[DWBH]

Wooo Hooo! It works!

The leds brightens as I put my hand above the antenna!

[oldrocker]

So do the BugBrand effects use cv for their touch control designs?