MCMEAT Question

chicago_mike · Post by **chicago_mike** » 09 Oct 2009, 13:05

How the heck do I wire the jacks for the pedals? I dont see this on pisotones or the pdf.

HELP!

himister · Post by **himister** » 09 Oct 2009, 13:13

I hope I understand you right.

Maybe this would help.
http://www.tonepad.com/getFile.asp?id=76

chicago_mike · Post by **chicago_mike** » 09 Oct 2009, 13:33

oh, sorry..

the mcmeat has 2 1/4 jacks for controller pedals. Like a BOSS fv-5 for decay and Intensity.

sorry for the confusion.

himister · Post by **himister** » 09 Oct 2009, 13:46

Oh sorry...my bad.

Did you refer to this one:
http://experimentalistsanonymous.com/di ... McMeat.pdf

chicago_mike · Post by **chicago_mike** » 09 Oct 2009, 14:04

Yep

But I cant see anywhere on that where the pedal jacks are connecting too.

jupagblkxten · Post by **jupagblkxten** » 09 Oct 2009, 14:16

the jacks would bypass the pots. though i don't know why anyone would want foot control over the intensity knob. i always used mine on full and have since left that control out of my builds.

chicago_mike · Post by **chicago_mike** » 09 Oct 2009, 14:31

Yeah they bypass the internal pots so is it as simple as hardwiring them(jacks) to the pots?

Stupid Q I know.

jupagblkxten · Post by **jupagblkxten** » 09 Oct 2009, 14:33

more or less. i would go the route that lovetone does and wire them to the board.

chicago_mike · Post by **chicago_mike** » 09 Oct 2009, 14:36

I hate to ask this....are these connections on the mcmeat layout? I dont see them.

Unless they are right frikkin there and my eyes are on crack.

jupagblkxten · Post by **jupagblkxten** » 09 Oct 2009, 14:41

nope.

chicago_mike · Post by **chicago_mike** » 09 Oct 2009, 14:48

didnt know of a wiki page for this. I'm using the data from the pisotones page. Wish I have translated in babelfish since my spanish is nada.

Im being all silly about this cause I drilled the enclosure for the jacks...so of course I just HAVE to have them filled and useful...

I couldnt just build it simple yanno...I HAD to go all the way.

chicago_mike · Post by **chicago_mike** » 11 Oct 2009, 15:19

NEW QUESTION:

How would I wire up the Sweep control with a footswitch, either a 3pdt or a dpdt?

Thanks!

jupagblkxten · Post by **jupagblkxten** » 11 Oct 2009, 15:30

count how many poles the switch has.

chicago_mike · Post by **chicago_mike** » 11 Oct 2009, 15:38

It looks like I have to use a 3PDT, wich in a rotary I have to special order, so I can use the blue footswitch style units I have...just wondering..I think I have it right, but Im always open to other input.

This thing is a wiring nightmare!

jupagblkxten · Post by **jupagblkxten** » 11 Oct 2009, 15:49

special order? mouser carries them, as does small bear just to name a couple. they're usually cheaper than the footswitches, too. you've already got to order one for the filter; why not just order two?

chicago_mike · Post by **chicago_mike** » 11 Oct 2009, 16:01

I know...I just want this damned thing done.

I have all the other rotaries, cause my local shop has those..just not a 2 position one.

flood · Post by **flood** » 13 Oct 2009, 04:40

chicago mike, you don't specifically need a two position one... the rotary switches have a stopper under the nut that allows you to select the number of usable positions. simply remove the nut and you'll find a disc with a tab underneath, as well as a number of slots. keep your conductivity tester handy and you should be able to figure it out pretty quick. good luck

my mc meat is assembled and now needs wiring. i've used white superbright LEDs with LDRs in heatshrink since getting vactrols here is pretty much impossible and importing them is a fairly costly affair.

ryanuk · Post by **ryanuk** » 13 Oct 2009, 15:09

chicago_mike wrote:didnt know of a wiki page for this. I'm using the data from the pisotones page. Wish I have translated in babelfish since my spanish is nada.

Im being all silly about this cause I drilled the enclosure for the jacks...so of course I just HAVE to have them filled and useful... I couldnt just build it simple yanno...I HAD to go all the way.

chicago_mike - the mcmeat is one of my future builds!! I've done quite a bit of research...

Wiring the pedal jacks is relatively painless.

Pisotones choose to use those black box switchcraft type jacks. I'll try to explain how they work (translating from pistones!!). They have 8 pins. Looking at the diagram on the psitones site, pin 1 is normally connected to LIVE, pin 2 to ground (masa). With a jack NOT connected, pin 3 connects to 4, and pin 6 to 7. With a jack connected, pin 4 now connects to 5, and pin 7 to 8.

Hopefully from this decription, you should be able to figure out how the jacks and pots are wired.

Heres some more info if required...

For Decay pot - the jack should be wired so that the pot in the expression pedal is in SERIES with the on-board decay pot i.e. the pedal pot adds extra decay time to whatever is dialled into the on-board decay pot. For this you need to use a switching jack that breaks the connection to ground at point L on the mcmeat board, and inserts the expression pedal pot. Using the info about the jacks above, and the diagrams on pisotones, you should be able to work it out how.

For Intensity pot - the jack should be wired so that the pot in the expression pedal is in PARALLEL with the on-board intensity pot i.e. used as a fine tune within a limited range set by the on-board pot. It works better with the pot on the main unit set to lower values.
For this you need to can use a standard jack as there's no switching. The ground of the jack should be connetcted to the wiper of the intensity pot (point M on the McMeat PCB). The tip of the jack going to to one end to the intensity pot. Pisotnes isn't clear as to which end!! I believe it should be the one connected to Sw2B on the McMeat schematic - cant see how it would work connect to the other end (point M).

PLEASE NOTE: I think I've spotted is an error on the pisotones wiring diagrams for the insensity pot and sweep switch. The intensity pot wiring shows 2 terminals tied together and joined to point M on the PCB, which is CORRECT. However, the SWEEP switch wiring shows the switch wired to the SAME terminals on the Intensity pot, whereas it should be the outside, unused terminal. Could someone re-check this for me??

For reference, here's the manual - It has some detail on the pedal inputs and loop etc.
http://files.effectsdatabase.com/docs/m ... atball.zip

Hope this helps...

RyUK

chicago_mike · Post by **chicago_mike** » 13 Oct 2009, 15:52

My hero!

Intensity wiring does look WRONG checking both gif's that are associated with it. Windows 7 has a nice page / ;ayout comparring feature wich I use all the time now.

chicago_mike · Post by **chicago_mike** » 14 Oct 2009, 02:24

wonder how I would wire up a jack for external blend control..