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Stompbox for modules
MUFF WIGGLER Forum Index -> Guitars, Basses, Amps & FX  
Author Stompbox for modules
Kwote
i was just messin with my guitar through various modules and realized it'd be nice to have a stomp for the cv's so i could engage and disengage each module's effect.

is there a generic multi stomp out there for this type of thing or should i readdress this in the DIY section?
felix
Sort of, basically sounds like you want a simple footswitch to break the patch connection. You could do this with any "true bypass" design that you can find (they are all passive, no components other than jacks and switches) and simply don't wire up one half of the switch. When it's switched "in" you have your CVs, when it's switched "out", it's as if you've unhooked the cables since you have in effect broken the connection.
Kwote
felix wrote:
Sort of, basically sounds like you want a simple footswitch to break the patch connection. You could do this with any "true bypass" design that you can find (they are all passive, no components other than jacks and switches) and simply don't wire up one half of the switch. When it's switched "in" you have your CVs, when it's switched "out", it's as if you've unhooked the cables since you have in effect broken the connection.


that's exactly it. i want to house like 8 to 10 stomp switches in a row in one box.

not trying to be lazy but do you have any links to one of these designs?
flts
For just a few more wires and 8 to 10 more jacks you can make it a simple A/B switcher so you can switch between two patch cable routings (if all three jacks are connected) or break the connection (if one of the "output" jacks is unconnected). So with a single stomp you could, say, route the LFO either to filter or VCA or whatever depending on switch position.

Think of it in groups of three jacks and one DPDT stomp switch, and multiply by the amount of switches you want. There are no connections between the individual groups. For every one of those groups:

1) Wire one of the jacks (the "common" / "input" jack) to the center poles of the DPDT switch.
2) The switch controls which poles the center ones are connected to, the top or bottom row
3) Wire one of the "output" jacks to the top row and another to bottom row - just remember that the tip and sleeve are connected on the same side of the switch for all three jacks

Here's a quick "schematic", O is a pole in the DPDT footswitch and --- is wire:

connector 2 sleeve --- O O --- connector 2 tip
connector 1 sleeve --- O O --- connector 1 tip
connector 3 sleeve --- O O --- connector 3 tip

It's that simple. If there's nothing connected to either 2 or 3, setting the switch to that position means it breaks the connection. If you don't think you'll ever need the A/B, just leave jack 2 or 3 out for every switch.
flts
If it wasn't already clear from that one, here's something I found with quick Google: http://www.talkbass.com/forum/attachment.php?attachmentid=90115&d=1209 764691 ... Just put as many of those in one box as you want channels, and leave one of the side jacks out if you just need to make or break a connection.
Kent
The expensive but 'proper' option:


http://www.voodoolab.com/gcx.htm

Teamed up with the 1st version of this, is how I roll:


http://www.voodoolab.com/gcontrolpro.htm


Cheaper, yet still cool.



http://www.voodoolab.com/switcher.htm




The Voodoo Labs products use gold-plated nitrogen sealed relays. I've had my GCX rack switcher for.... geez, I dunno 15 years? And it still works flawlessly and switches silently.

The GCX (rack unit) can be chained if you need more than 8 loops & will respond to MIDI program change from anything. With the correct MIDI cable, it will even power the footswitch unit.
Kwote
very much appreciated flts.

@ Kent that Voodoo Pedal Switcher seems cool http://www.guitarcenter.com/Voodoo-Lab-Pedal-Switcher-Guitar-Footswitc h-150459-i1380144.gc

but how can i be sure it'll send the right amount of voltage. have you ran it with your blacet modules?
wetterberg
http://www.dv247.com/invt/52354/ ?
Kent
Kwote wrote:

@ Kent that Voodoo Pedal Switcher seems cool http://www.guitarcenter.com/Voodoo-Lab-Pedal-Switcher-Guitar-Footswitc h-150459-i1380144.gc

but how can i be sure it'll send the right amount of voltage. have you ran it with your blacet modules?


Perhaps me no understand good. Me thinked that you want like this:

http://www.analogman.com/switchbox/index.htm


but MOAAR!!!! non?


Like so, no?

Please to be letting know if wrong.

My solution eez more like all audio signal go through and modules to be switched in and outzee of signal pathways.

Is right, no?

OKay. Bye now. K?
Kwote
seems like it i just don't know what can of voltage would reduce the effect. maybe i'm just being lame but i'm thinking it would need a specific voltage amount to actually disengage the CV's that are effecting my guitar signal.
Kwote
wetterberg wrote:
http://www.dv247.com/invt/52354/ ?


that looks okay but the layout isn't doing it for me. i want all the switches to be parallel.
flts
kwote, could you re-explain carefully what it is that you want to do? i'm getting kind of confused with the "i'm thinking it would need a specific voltage amount" part.

as i understood it was, what felix described: you need a stomp switch that either makes or breaks a connection made by patch cables. so you don't need any extra voltages or anything, just so that when you stomp on a switch it connects an output to an input in your modular, and when you stomp it again it disconnects them (or connects the output to another input). for example, you want to disconnect the guitar signal from a filter and let it go directly to a vca and vice versa, or you want to connect/disconnect a lfo from filter cv in with a footswitch. or whatever, you get the idea.

if that's what you are looking for, you don't need to worry about any voltage scaling or generation or whatever in the stomp box itself. you'll just need something that connects and disconnects things in the modular audio / cv paths. easy way to do it is to wire some footswitches and jacks the way i described. a more "advanced" way is to use something that uses relay switching, like what kent posted. if you do it the "easy" way you'll also need some longer cables that you wire from the modular to the stomp switch and back again, if you use the gcx system kent posted you can keep all the connections in a rack and use the stomp switcher to control the rack unit -> shorter cables.

edit: or if you just want to switch complete modules in and out of the signal path, you can wire a bypass switcher like what kent described later... so basically in that case audio comes in and goes thru a series of switches, and if the stompswitch is on the audio gets routed to an effect and back to the next switch and if the switch is off, it just gets routed straight to the next one.
plord
Ok, wait, wait, what? The believe the correct answer for those of us with The Modular Aaffliction is: What do you mean, footswitch? We're talking about processing your guitar through your modular, so OF COURSE you want to have VOLTAGE CONTROL of any routing or switching ! SlayerBadger! Then you can switch the effects in and out with any CV pedal, or the Moog thing, or your 311 controller and JAGS, or from the Noise Ring, or even some DIY multi button footswitch contraption that, apparently, you'll have to invent smile

Here is one DIY version of a CV switch: http://www.zen22142.zen.co.uk/Circuits/Switching/vcs555.htm Or if you want the platinum coated version, you can build up the MOTM-700 http://www.synthtech.com/motm700.html behind a Frac panel; this is what I'm doing quad Wiard style. Paul sells the PCB and rare chips, Scott at Bridechamber sells the rest of the parts.

Or, of no interest to you personally, Doepfer has a VC switch. and unless I'm crazy and it is hiding under a different name/primary function, CGS does NOT have a simple switch. But jeez, don't make yourself tapdance, let the modular make all those decisions for you!

This has been: The Voltage Police. We'll let you all off with a warning this time smile
flts
lol epic win!
neandrewthal
plord wrote:
I'm crazy and it is hiding under a different name/primary function, CGS does NOT have a simple switch.


Perhaps both? razz

Analog switch matrix Simply 4 simple SPST switches with a common pre-switch mix input and pos-switch mix input. Of course, you don't need to build everything you don't need.

I dig this one. Very simple when you consider that 80% of the circuit is for the reversing attenuators which you can leave off if you dont want em (but I do, because then you have a very flexible comparator on the input and 2-step sequencer on the output)
Kwote
i'm just looking for manual breaking of the patch connections via footswitch. sorry for confusing the situation as i was confused smile
Kent
Then you be wantin' the kind o' shit I mentioned.
plord
Ah, right, forgot about the Tellun. Cheaper than the MOTM for sure and no super rare parts.
Kwote
neandrewthal wrote:
plord wrote:
I'm crazy and it is hiding under a different name/primary function, CGS does NOT have a simple switch.


Perhaps both? razz

Analog switch matrix Simply 4 simple SPST switches with a common pre-switch mix input and pos-switch mix input. Of course, you don't need to build everything you don't need.

I dig this one. Very simple when you consider that 80% of the circuit is for the reversing attenuators which you can leave off if you dont want em (but I do, because then you have a very flexible comparator on the input and 2-step sequencer on the output)


those look nice. i'll add them to my want to buy list. smile
22tape
howabout this?

http://4mspedals.com/bendmatrix.php

i just sent Dan at 4ms some questions to see if i can spec it out bit. i'm gonna get one...should be too much fun!
wetterberg
22tape wrote:
howabout this?

http://4mspedals.com/bendmatrix.php

i just sent Dan at 4ms some questions to see if i can spec it out bit. i'm gonna get one...should be too much fun!
Nice, in concept at least. I find them to be absolutely ENORMOUS machines for what they do, though... amirite?
22tape
wetterberg wrote:
22tape wrote:
howabout this?

http://4mspedals.com/bendmatrix.php

i just sent Dan at 4ms some questions to see if i can spec it out bit. i'm gonna get one...should be too much fun!
Nice, in concept at least. I find them to be absolutely ENORMOUS machines for what they do, though... amirite?


i don't think they're THAT big. dimensions are:

2mm Aluminum panel 12" x 10" on aluminum box (2" tall)....

that's not bad at all, imo
wetterberg
wow, I reckon you're right. Hmm. Must have totally misunderstood all those pictures, hehe.

Definitely get the one with the trigger inputs if you decide to go for it, though.
22tape
i hear ya....they look alot bigger on the youtube vids. i think its the camera angles....

but yeh, not bad at all....

mmmm, trigger inputs SlayerBadger!
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