• About Nava:
    Nava is Roland TR-909 Rhythm computer clone. This is an exact reproduction of the analog part of the TR - 909  (with the exception of the BA662 VCA Clap has been replaced by a BA6110) coupled with a MIDI sequencer.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 Nava v1.0 user manual)

Nava tr 909 clone Roland

  • Characteristic of Nava v1.0
                        -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 BD, SD, LT, MT, HT, RS, HC and CH
                        -A total accent track
                        -Master out (L/R Mono) 6Vp-p 1Kohm
                        -tempo  30 - 250 Bpm
                        -7 shuffle levels
                        -4 scales (1/8t, 1/16, 1/16t and 1/32)
                        -4 sequencer directions (forward, backward, ping-pong and random)
                        -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 Nava v1.0
                        -3x program EPROM 27C256 with the sound of HitHat, Crash and Ride as those present in the original TR-909.
                        -36 x M5218L Mitsubishi. Those are the original TR-909 OPA
                        -2 x HD14006BP 18 Bit static shift register used to Noise generator
                        -1 x AN6912 Quad comparator. HandClap envelop generator identical to that of TR-808.
                        -1 x BA6110. This is the only component that we have replaced the original TR-909.
                        -19 x 2SA1115-F PNP transistors
                        -56 x 2SC2603-F NPN transistors
                         -4 x 2SA798 PNP Monolithic Transistor Pair
                         -2 x 2SD1469 NPN Small signal transistor
                         -2 x 2SC2878 NPN Epitaxial transistor for muting application
                         -27 x Potentiometers Potentiometers (all necessary controls for the construction of Nava v1.0)
                         -19 x Cherry switches with whites caps
                         -17 x illuminated square tact switches

All other components to complete your kit are available in this Mouser BOM: .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.  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:

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 Nava 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:

And polystyrene capacitor have to be this one:

Transistor are marked like follows:

nava tr 909 clone transistors

2SC2603 and 2SA1115 has different silkscreened symbol, so you can't mix it ;)

nava tr 909 transistor symbol

Let's start to sort 10Kohm resistors for crash, ride and hihat digital to analog converters. Measure the value of all 10Kohm resistors and keep the one whose value is closest to 10Kohm (more or less 0,3%). You need five of them.

nava Tr 909 clone resistors select

We recommend that you build your kit in the following order
                    -Power Supply
                    -IO Board
                    -Master: As the master section GND come from the IO board you have to build it after the IO board

  • Sample: