racking the fooger collection

[latigid on]

Righto




It's a bit tricky without the gear in front of me, but try this:

Use the half-normalled config with the grey socket in the front

Rear B should go to the correct CV input of the MF104 (TRS cable)
Rear A should go to the 100k dummy load (1/4" plug (MUST BE TRS, RING IS NOT CONNECTED), resistor tip to sleeve)

Plug your CV into Front B (grey)

Presumably this will disconnect the dummy load and "insert" your CV or Exp pedal.

Please try it and see if it works!

[willi]

What happened to the Drive and Level pots on that delay?

[seank]

oooooh. i get it now. thank you so much! that was a revelation.

so if i use a 90 degree trs plug with a 100k resistor from tip to sleeve, i don't actually need a cable connected to that plug right? it's just the plug? that makes sense to me.

[latigid on]

willi, heh, yeah I was trying a few things. The input levels work a bit strangely IMO and I was seeing if I could make things a bit better. I couldn't find a better solution for the moment so they'll probably go back in unchanged.

seank, you've got it. I hope it works for you and you have enough patch points! POIDH

[seank]

Now I'm paranoid that I won't have enough patch points. There are 52 connections total, 10 are used to chain the pedals together leaving 42 going to the patchbay. If I did want to modify the patchbay with the resistor like you were saying (it was the patchbay and not the pedal itself, right?) to save a patch point how would I go about doing that?

[latigid on]

Yes, you would be modding the patchbay, not the 'fooger.







Above is how you would wire a socket. In an off-the-shelf PB the situation will probably be more complex than this, as there are additional traces on the PCB so it "knows" what you plug in and which configuration you need.

The operation is pretty simple: pins 1, 2 and 3 represent the normally closed switch contacts. 6, 5 and 4 are the T, R, S contacts, respectively. When no plug is inserted, the switches are closed and the signals flow to/from pin 1<>6, 2<>5 and 3<>4. When a plug is inserted, the signals instead flow to/from pins 6, 5 and 4 to the T R S plug and are disconnected from 1, 2 and 3.

So for the 104, an expression signal is represented by

6: CV/"resistance" (input)
5: +5 VDC output (supply)
4: ground

And to "normal" your connection, you need to send the signal hitting pin 6 through a 100k resistor to ground, ONLY IF there is no plug inserted. No plug means pin 6 is connected to pin 1.

So connect pins 1 and 4 with a resistor, the input will be clamped to ground when you need it. Insert a patch cable and the resistor is out of circuit.

[seank]

your spear of wisdom has pierced my brain. and I thank you for this.

i'll let you know what the patchbay circuit looks like. should be a flawless victory.

[seank]

custom rack case in the house.



wiring everything up over the weekend. huge order from redco coming on tomorrow!

oh yeah, that empty space on top... it's for a slim phatty.

and on the floor... an mp-201. life is good.

[acatcalledanarchy]

Wow!

I want one... Where did you get your flight case made and to what specifications..? Let me know how you get on with your wiring / soldering shenanigans.

Peace, love and flowers...

[seank]

a&s case company in north hollywood. i could get you specs if you need. could be a bit smaller, but i wanted room for the power supply.

[slabwax]

Nice looking case ( I just couldn't bring myself to say Nice Looking Rack). Thanks for posting the photo. A Sp will top it all off nicely.

Slabwax

[seank]

here's what the pcb from the patchbay looks like. not sure how to get the 100k resistor to do its job.



also, i should be running most of the cv stuff in the "isolated" configuration, right?



the murf is acting weird. it's like the mix is all the way down when it's plugged into the patchbay. might need the resistor on these inputs as well?

also, the freqbox is giving me some strange noise like it's being modulated by something. the wave seems to jump randomly.

i need to step away for a moment, i've been piecing this together and soldering for 2 days straight.

[acatcalledanarchy]

Hi SeanK

Sent you a Private Message - good luck with the rest of your soldering shenanigans.

Peace...

[latigid on]

Hi Sean, let's keep it public so others may learn from your troubles ( ?)

here's what the pcb from the patchbay looks like. not sure how to get the 100k resistor to do its job.

Perhaps upload a close up photo and it might be a bit clearer. It looks like some sockets are non-switched. You'd need to use a switched one for this to work.

also, i should be running most of the cv stuff in the "isolated" configuration, right?

Sounds good.

the murf is acting weird. it's like the mix is all the way down when it's plugged into the patchbay. might need the resistor on these inputs as well?

First off, check your soldering, you may have a short somewhere. When you use an expression pedal on any of these CV inputs, the knob must be turned to halfway. I've used a patchbay with my MuRFs; no problem from memory.

also, the freqbox is giving me some strange noise like it's being modulated by something. the wave seems to jump randomly.

Try powering from a separate wall wart and see if the issue remains.

i need to step away for a moment, i've been piecing this together and soldering for 2 days straight.

That's usually a good idea.

P.S. case looks really good so far, I hope everything works out properly in the end.

[seank]

just in case you can't make it out: in the top photo, the grey jack is on the top left.

i'll post schematics/dimensions for the case when i'm all done with everything.