Meatball / McMeat Layouts with on-board switches

[Strategy]

Im going to try this one out. The McMeat is a wire nightmare. I just wonder what size enclosure we'll need.

thanks chicago_mike look forward to seeing the results if you can verify that it works.

If you want to use an enclosure that "echoes" the original Lovetone enclosures check out these Hammond sloping consoles:

http://www.hammondmfg.com/dwg16.htm#10degree

I'm using one for my Great Cheddar (Big Cheese) (which I can't photograph and post yet as it's at the powder coat shop this week being painted.) These don't "flip" like the original Lovetone enclosures, but they are robust, not too expensive (mine was $19 from Mouser) and come in a variety of sizes.

- Strategy

[chicago_mike]

cool. Forgot about those. Ive been thinking of getting a powder coat machine from  harbor freight....

[chicago_mike]

Okay I dont know what size this layout is supposed to be. Everytime I get it right for the IC'c it looks way too small for the rotary switches.

Could someone let me know what size in MM is the board without any border? THanks!

[Strategy]

Review the posts on page 2, there are some measurements proposed, the layout author claims that the rotary switch configurations are slightly small for their choice of hardware, so they "had to bend the pins" to get the rotary switch in. You could probably modify the layout in photoshop to more easily accommodate your rotary switches (?)

- Strategy

[chicago_mike]

Man...I want the work done for ME! ME ME ME! 

[ringworm]

I've knocked up a version of this in Eagle, so that should keep the ic's and switches at the right size, also I have a layout that should make things easy to build. If anyone can spot errors (glaring or otherwise) please say. As you can tell,  I only have the 'light' version of eagle so could not fit everything in the layout size available but you can deduce fairly easily what goes where on the right hand side. I'll draw up a version with jumpers inked in and post that if anyone has trouble following it, also i havn't got round to filling in the values, follow the mcmeat pdf for that info.

[chicago_mike]

I have the full blown eagle. If you want to, send me what your working on and Ill check it out. I also have B2 spice to check stuff out.

PM for my email addy. Oh, make your traces 24mil , its easier to transfer to pcb with home made methods. I found out the hard way.

[Strategy]

bump

chicago mike and ringwork: any update on a test worthy layout?

- strategy

[chicago_mike]

Almost done, been super busy.

[Strategy]

If you get something that needs beta testing let me know and I'll try to etch a board and test it as well. I still cannot get my 'standard' mcmeat working, so looking forward to helping develop any alternative! PM me if you get something that needs 'beta'-ing.

- Strategy

[Skruffyhound]

Little bump , I'm etching in the next two days, would be really nice to get this in with the rest of the batch, if there's been any progress. Thanks for your work!

[ringworm]

I've updated the two files I had previously posted. I've also made a file of the off board wires. Mike is working on an Eagle project of a much more thorough version of this from the same .brd file.
The part numbers on mine correspond to the original mcmeat pdf which still works afaik, i only rejigged the layout for sizing problems with the ics and switches.

[Strategy]

I might just give this a try on the testing tip...!
Thanks!!!
- STrategy

[Shed_FX]

Hello,
Just checked in and saw this had come up again. I left the final write up as most people seemed content with doing the wiring. The layout that I did works as I have the working unit. The only problem is the rotary switches are reversed in position on the front panel of the pedal if that makes sense.
The final layout was this one


The front of the pedal looks like this (asthetically finishing pedals was never my strong suit!)



The layout above I see is based on mine soo the rotary switches will also be in the wrong place.

The best solution for this project may be using the original layout if someone can find a good picture of the original board.
I need to get a load of bits sorted for the Wobulator project (which works but ticks, see the other thread) and I completed the layout for the doppelganger but never got round populating the board. Finally the flange with no name I have a layout and parts list but not a shematic for where the parts go. Just one thing or another, buying a house and building a car has kinda taken up all of my time.

Anyway have fun with the project.

Tom

[Strategy]

by 'reversed in panel position' I assume you mean that the switches are in different locations than on the original meatball? I think that is only important if you are trying to recreate the front panel - as long as it doesn't affect functionality it's not a huge deal probably. Please verify?

I resurrected this thread hoping that a new Layout would fill some of the gaps in what's currently there- the Joep layout is rock solid but its followed by an array of conflicting/contradictory/confusing info and threads regarding the wiring. Hopefully what you started here and the new layout work can evolve into a new project file.

- Strategy

[chicago_mike]

So I get to start over after a crash. No worries, we will prevail!

What size box is that? THe graphics dont look too bad.

[Shed_FX]

Yes it is just that the switches are in the wrong places as far as the original unit goes. If you compare the front panel of mine with the original unit you will see what I mean.
I used the pisotones website to do all of the links for the switches and pots and thinks seemed ok. I did it a long time ago now but it required very little debugging. The box is a pressed aluminium box from Maplin here in the UK. It was the only thing I could find which would accomodate the board of approximately original size. It is just cuboid and not sloping.

[ringworm]

Not sure if it's bad form to post these, they're not mine, I found them through Google pretty quick and hadn't seen them before but these are the best gutshots I've been able to find. If there are any objections I can take them down but they are definitely worth a look as afar as this thread is goes.
Check out the LDRs and LEDs! Not a Vactrol in sight!

[Skruffyhound]

No Vactrols is good news, cheap and cheerfull. Thanks for the gut shots, now I understand that this is the only way to go, all those, what, 56 switch leads and 18 pot leads making noise, no thanks. Etched today but didn't have a big enough piece of board for this

[ringworm]

Ok, I've had a go at this from the pictures and have gone over it against the schematic in the v1.1 mcmeat.pdf and I think it might be good.
Not sure when I'll have a chance to build and test this myself but feel free to have a go yrself. The partlist corresponds to the  mcmeat.pdf so you will need that, it can be found in this thread somewhere. I've designed it with vactrols but it would be easy to do the led/ldr thing also. the jumpers (in yellow) go off the layout (i did all my work in a trial version of Eagle, cutting and pasting in P'shop) but it will be easy to see where they go on the pcb. The files are correct size at 300.025dpi (don't ask about the .025 something about Eagle exporting at that size).
if anyone sees any glaring errors, please tell and i'll correct. I havn't got round to figuring out the supply and in/out yet but will post that as soon as I do.