• About Yocto²:
  Yocto² is Roland TR-808 Rhythm computer clone. This is an exact reproduction of the analogue part of the TR - 808 (with the exception of the BA662 VCA Clap has been replaced by a BA6110) coupled with a MIDI sequencer. You can store up to 128 patterns organized into 8 banks of 16 patterns in a Non-volatile EEPROM. Various functions have been added such as the ability to mute every sound, to chain patterns as you want, copy, paste, clear patterns ... (cf  Yocto² user manual)
  

• Characteristic of Yocto²
  -128 Rhythm patterns from 1 to 16 steps
  -16 tracks of 999 measures
  -1 external instrument track by pattern that can store 99 notes like SH101 sequencer style.
  -A Midi keyboard mode allow you to play external Midi device
  -Multi out for each instruments
  -Individual accent for all voices
  -A total accent track
  -Master out (L/R Mono) 6Vp-p 1Kohm
  -tempo 30 - 250 Bpm
  -7 shuffle level per voice or global
  -4 scales (1/8t, 1/16, 1/16t and 1/32) per voice or global
  -4 sequencer directions (forward, backward, ping-pong and random) per voice or global
  -Easy copy and paste pattern function
  -Shift left or right the entire pattern or individual instrument
  -In/Out/Thru Midi
  -DinSync 24ppqn Out
  -Trig Out 2ms +5V
  -And More...

• The kit includes:
  -2 x PCBs: the Mainboard and the IO Board
  -The µC, a Atmega1284P pre programmed with Firmware Yocto v2.0
  -1x  HD14584 HEX Schmitt Trigger used as Noise generator
  -1 x AN6912 Quad comparator. HandClap envelop generator identical to that of TR-808.
  -2 x BA6110. This is the only component that we have replaced the original TR-808.
  -18 x 2SA733-P PNP transistors
  -51 x 2SC945-P NPN transistors
  -2 x 2SK30-A JFET transistord
  -1 x 2SC828R NPN Small signal transistor
  -2 x 2SC2878 NPN Epitaxial transistor for muting application
  -27 x Potentiometers Potentiometers (all necessary controls for the construction of Yocto²)
  -19 x Cherry switches with reds, oranges, yellows and whites caps
  -17 x red illuminated square tact switches
  -6 x 1N34A Germanium Diodes

All other components to complete your kit are available in this Mouser BOM:  http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=ae6c8bf807 .The only component that you must get is a 15VAC supply 1000mA, the same used for the Yocto v1.0. A screen printed aluminum case will soon be available on the forum (ask KacperPawluk). The wall wart PSU have to be a 15VAC or 16VAC 1000mA. It is easily found at all distributors of electronic equipment. You can find it here: Jameco_16VAC_1000mA .

• Build it:

Parts lists and building guide are available in the Download section on the Yocto² product page ;)

For assembly process you need a soldering iron, tin, wire cutters for electronics, multimeter.That is it. Settings for different sounds you'll need either an oscilloscope or Scope software that allows you to use your computer's sound card as an oscilloscope. Be focused and meticulous during assembly, pay attention to orientation of the polarized electrolytic capacitors, diodes, transistors and integrated circuits components. If you don't find a component position, download the BRD file Yocto² PCB and the trial version of Eagle. Open the file in Eagle and click the "Show object" function represented by an eye, then type the name of the component you are looking for the location and press Enter. The component will highlight indicating its location. Patience and organization are the key words that will make your Nava work the first time. If it's your first project or you never soldering a components have a look on this Soldering tutorial:

The components you will receive may differ from the components on pictures mounting tutorial, this is due to regular update of Mouser list. Especially for the non polarized capacitor:

Film capacitor could be one of those:

Ceramic capacitor could be one of those:

• Demo: