If it’s right (and I’m hoping MiL0 or extraclassic could check please 
), then I know where to wire the arcade buttons to and which arcade buttons will be where.
One thing I need to check though. If 1-3 are unused by the original numpad (as it seems from my understanding), can I then use them or are they not recognised by the brain?
the next step is re-creating the circuit using wires and buttons!
according to your chart above, connecting a button via two wires to terminals 7 & 8 will replicate the ‘Enter’ key, for example (edit: oops, bad example as Enter actually uses three terminals… you get the point though)
Looks like most of the terminals have 4-6 wires connected to them… so you could daisychain wires by following the chart. This would mean that you only need to connect one wire to each terminal, and then daisychain (solder more than one wire to a terminal) the rest of the wires.
gah, it’s hard to explain properly… hope it makes sense!
edit: terminals 1-3 are unused by the numpad… its unlikely that they would do anything if wired up… doesn’t hurt to try though does it!
I thought using a keyboard was more complicated than it is. Thanks for the explanation guys.
i think your chart is right, it just make a map on paper of where wires need to go. a circuit diagram if you like
No probs. It was my intention with this thread to show how someone can get from knowing nothing to having a mod controller. Will be posting step-by-step photos/logs as it goes along too.
Going away with work for a few days today though, and waiting on parts deliveries from eBay, so might take a couple of weeks to get there.
I get what you mean. So the + wire goes from terminal 4 to all the buttons that use for by going to + on first button, then wire from same + on that button to the next button using terminal 4 and so on.
However, all use 2 terminals, and a couple use 3 obviously. so that mean some of the arcade buttons will have 2 wires soldered onto the + (one to daisy chained onto next button in terminal, and one daisy chained in from button on another terminal). Does this sound right?
That’s the plan. Here’s a rough sketch of a diagram, where they are all connected to the + terminals on each arcade button. Does this look right?
Where would the wiring from the other terminal on the arcade buttons go?
I get it now. Daisy chaining sounded complicated but it all makes sense. I love this thread!!!
So do you have to daisy chain the - terminals on each arcade button the same way as you do the + terminals?
Where are you getting your arcade buttons from?
Hmmm I think you get the general idea but i can see a couple of possible mistakes… don’t forget each button needs at least 2 wires connected to it… The “. Del” button only has 1 wire.
Also I’m not quite sure how the daisy chaining will work when you start to attach more than one cable onto each terminal of a button. Your wiring diagram doesn’t show which terminal each wire is attached to on a button. This matters! Otherwise, if u get it wrong, the circuit will be completed even when the button isn’t pressed.
Going back to your original excel chart, I think the best way to approach this is to make sure that all the wires on column one (the top plastic sheet) are soldered to the + terminal on the arcade button and all the wires on column two are soldered to the - terminal.
You basically want to avoid creating completed circuits when no button is pressed down. Hope that makes sense!
This is what I’ve worked out from your Excel chart:
key: green wires get soldered to one terminal on the arcade button, red wires get soldered to the other terminal.
Basically, it looks alright to me but obviously I haven’t checked it against the actual plastic sheet circuits so there might be some mistakes.
Actually, I can see one already - look at your chart and check out “Del” and “2” - they both share the same circuit which doesn’t look right to me…
hi. I’m working on a numpad-mod myself at this time.
i plan on using a soldering board to keep the wiring to a minimum.
i want to solder every connection i need to the board, and then solder every button to their dedicated board-lanes.
this way every new button only needs 2 wires. in addition, it should give me some flexiblity. if i want to add or remove a “number” from my diy i dont need to rip of half of my mod 
whats your opinion on this?
i added a little (messy) drawing
Yes you could do it that way if you want.
Just buy some stripboard like this (I use it in most of my projects)
It’s good to see you on the forum my friend.
this is a brilliant thread, just what i was looking for, ive been weighing up the options, i have a spare gamepad, a number pad and some buzz controllers lying around. i just want a basic midi fighter style controller for now and build something else later on, my question is, will you be able to use the instant gratification mappings on this??
great work so far and i look forward to seeing it finished.
You would be better off using a buzz controller or gamepad to use the instant gratification mapping 
numpads don’t require intermediary software to work with Traktor but as a midifighter clone, there’s quite a limitation in the fact that you probably can’t press more than two arcade buttons at the same time. Before you start the mod, it’s probably worth mapping your numpad to Traktor cue points and testing it out to see if you can live with any limitations.
I’m still working on this. Just having broadband issues with my ISP. BT are truly fucking shit!
Amazing, we have been doing the same things this week!
Here’s mine so far.
Bought numpad from eBay £3.50 delivered!
I would advise making sure that the numpad has cursor arrows and home, insert, Del on top of the usual numbers and symbols, this way you can use the ‘numlock’ button to add another bunch of mappable keys!
Once open it looked like this:
This made mine a bit easier to understand, each half of the shiny circles is a + or - so just touching one half to the other makes the button work.
I want to point out here that I CAN press at least 6 buttons at the same time, and no reason to think I can’t press and hold all of them!
So next step was to prepare for soldering, to do this I drill very small holes for wires to sit in:
This is where I discovered the daisy chain, when tracing the circuit lines to the chip, I notice that all of the buttons connect to one of three ground pins on the chip. This means in theory I only need 3 wires to be soldered for ground, then link them to whatever buttons were part of the original chain.
Hope this helps add a bit of clarity.
That Numberpad pcb will make it alot easier.
Nice find any chance of a link?
Can’t do links that well from my iPhone, but search eBay for:
Commtel USB Numeric
Beware! I learnt my first lesson yesterday, the circuit board is double sided so be careful where you drill, there is at least 1 button that cannot be directly drilled through, but there is a way around it by linking from other buttons.
Thanks.
Here’s the link for anyone interested
To be honest i would’nt drill it anyway - just a quick rub with some wire wool then secure with hot glue.
