Demo 3: Ornament And Crime a la Carte

I admit that this is a bit of a stretch for the QICBoard system, but the Ornament and Crime is so fun that I couldn't resist trying to build one.

This demo is built on a QICBase_ERL, a 34-HP Eurorack-compatible base which gets its power from the Eurorack case.

The core is a Teensy 3.2, just like the original O&C.  The extra boards are:

a 4-channel CV DAC, electrically compatible with the original O&C version,

a 2-channel trigger input, also compatible, and 

a board with encoders and feedthroughs to connect to a top-mounted OLED display.

That last board is a bit of a cheat: the encoder shafts don't quite fit into the 1/4" holes, so you need to (carefully) ream those holes.

Because I was only running the envelope generator, I didn't install the analog input or trigger output boards, demonstrating the "a la carte" nature of this kind of build.

Wiring is kind of jumbled in this pic.  Here it is unscrambled, going CCW around the Teensy, from the lower left

GND to breadboard ground

"0" to TR1 on trigger board

"1" to TR2 on trigger board

"4" to SWB (bottom switch) on UI board.

"5" to SWT (top switch) on UI board.

"6 "to DC (display DC input) on UI board.

"7" to RST (display Reset input) on UI board

"8" to CS (display chip select) on UI board

"9" to RST on DAC board

"10" to CS on DAC board.

"11" to MOSI on DAC and UI boards.

"13" to SCK on DAC and UI boards.

"14" to SWR (right encoder pushbutton switch) on UI board.

"15" to ENCR1 (right encoder 1) on UI board.

"16" to ENCR2 (right encoder 2) on UI board.

"21" to ENCL2 (left encoder 2) on UI board.

"22" to ENCL1 (left encoder 1) on UI board.

"23" to SWL (left encoder pushbutton switch) on UI board.

Vin to +5V on breadboard.

The DAC and UI boards are powered (and grounded) from their dedicated 8-pin power connectors, but I added redundant ground connections from the DAC and UI boards to the breadboard ground, to help reduce the path between the Teensy ground and those boards' grounds.  The trigger board doesn't use any power, and it gets its ground connection from the mounting posts, but I added a redundant ground for the same reason.

DAC and trigger module schematics are on the board pages.  The user interface is a two-board sandwich, with the encoders on the bottom board, and the OLED and pushbutton switches on the top.

PDF of schematics of bottom board:

Altium source files of bottom board:

Gerbers of bottom board:

PDF of schematics of top board:

Altium source files of top board:

Gerbers of top board: