I think it only sends gate signals when the plates are pressed.

MFOS "Matrix Scanning 1V/Octave Keyboard Circuit" is designed for matrix keyboards.

A) Yes.
B) No, I have a crimping tool
C) Custom case / open-source case plans? (I'd like to repurpose a broken 49 key controller as a keybed, but that would require a longer chassis).

Also, we're working on a manual for release, hopefully, by the end of the year. However, in the meantime, for those out there who are a little confused by the signal routing on this thing, we've drawn up a signal flow diagram, which can be downloaded here . Thank you! That's handy! I saw you guys u...

Go to electro-music.com/forum and visit the DIY section. Ther in the stickies at the top will be a collection of Nicolas circuits. Find the ADSR which has a simple, inexpensive build on stripboard. More better, it is a really good ADSR. Can you please link me to the post? I cant find it :despair: I...

PCB is ~194 mm x ~120 mm

In case you want to put it behind a panel, make sure you solder C5, C16 and C20 leaning on the board

:woah: Would it work with other keybeds? So I've built this to give the original CPU (or the TUrbo CPU in this case) the 3 octave switch/diode matrix that it expects. It so happens that the Fatar 37 key OEM unit has this configuration. As long as the other keybed was laid out with the Make/Break sw...

Would it work with other keybeds?

Have you tried their facebook group? https://www.facebook.com/rakit.kits

If I recall correctly, the one I had issues with (isn't mine, helped a friend fixing it) had to have all the 2N7000 replaced as they were all DOA.

If you have a spare, you could try replacing one of Q2, Q3, Q4, Q5 or Q6 and see if that fixes it.

My first guess would be LED orientation... :)

Have you tried the "attachable battery unit"? I know it's not the transformer, but at least you'd see if it works.

I'm interested! +1 for the corner holes.

Is it just me or is the vca control extremely non linear? It’s hard to coax a smooth decay or release from it, even using external envelopes. At long decay or release settings, the vca stays at full volume then just falls to zero really quick instead having a slow drop in volume. All my units behav...

Looking at the schematic, I think the EG is a variation of this one http://electro-music.com/forum/phpbb-files/adsr_160.jpg (from http://electro-music.com/forum/viewtopic.php?t=31473). With my limited knowledge, it seems like the 1M pot for release was replaced with a diode (D10).

It's interesting that Dreadbox can't/won't release the schematics and they don't provide support either. Feels a bit like a black box when it comes to troubleshooting. :ripbanana: Could anyone confirm how the expo conversion works on this? I'm assuming it's done with the ATmega and a pair of DACs, s...

I'm in for a complete set!

I'm afraid you have to wait till the pcb & schematic pdf is published.

I'm glad to hear you got the steps back OB1! I hope you've ordered more than one 2N7000 replacement... (Please bear in mind, I'm not an EE, just trying to trace the symptoms on the schematic) LED problem: the LEDs are controlled by the other 2N7000s (Q2-Q6). I would try to replace Q5. Range problem:...

I'm afraid 2N3904 won't substitute the 2N7000...

I think I've found the issue with mine, Q1 (2n7000) seems to be broken. By using a multimeter in continuity tester mode, the source and drain legs seems to be connected. As far as I understand electronics (and bare in mind I'm not an expert in any sense) the diode between source and drain should not...

Have you tried shorting the reset and clock enable pins on the 4017 (13 & 15)? Mine has similar problems (only first step is cycled), and out of curiosity, I tried to invert the clock enable and it started to behave, sort of. The 4017 has +5V on the reset pin and 0V on the clock enable, which I thin...

I'm interested as well.

I'm interested as well!

Nice!

What type of switches are those?