Nava TR-909 Clone

Table of Contents

1 BOM: v1.0
2 Bugs
3 MODIFICATION:

BOM: v1.0

Bugs

update the Firmware to v1.023 (30 May 2017)

(current: http://www.e-licktronic.com/forum/download/file.php?id=106)

Release Notes:

http://www.e-licktronic.com/forum/viewtopic.php?f=25&t=864&p=4853#p4853

You should replace C89 (BD-Section) and C163 (Snare Section) by 10nF filmcap (Build manual and Mouser BOM updated)

HH Bug

http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=1233&p=7905#p7905

MIDI SYNC ISSUE (only if happen)

Sync test in slave mode with a TR505 and with Ableton and Midi interface.

Sync with hardware is perfect but Nava loose some clock signal when sync with a software thru a Midi interface.

Replace R365 value by 1K and R314 value by 4K7 to increase Midi signal should solve this issue or by replacing the Transistor on the switchboard (higher HFE)

only for rev.1.00 pcb: (not for 1.01, 1.02)

Issues: (respect the change for C89 and C163 too (to 10nF)

Afaik the first pcb (v1.0 ) has 3 bugs, all of them are highlighted in red in the build guide and are easy to fix.

BD: http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=889&start=50#p6085

SD: http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=970&hilit=snare+q43&start=40#p5823

Q43, Q46, Q49 Mixed Collectors and Emitters

This is a mistake. When we designed Nava SD PCBs, we placed this transistor to act like switches to generate SD envelopes. We had some sound test and it was okay for us but this transistors should act like amplifier.

To solve this issue you need to bend transistors pin 1 and 2 to swap their position in the pad.

Master: http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=850&hilit=master+mods&start=10#p4855

To bypass the muting circuit simply omit both transistors Q82 and Q83 and you don't need all part from the muting circuit (C142, C143, D193, D194, D195, R468, R469, R470, R471, R472)

open: check in BD C8 for closer BD Decay (the Nava Decay is bigger as the original)

modify C153/ C154 to 10uF check: http://www.e-licktronic.com/forum/viewtopic.php?f=24&t=850&hilit=master+mods&start=50 & https://www.gearslutz.com/board/electronic-music-instruments-electronic-music-production/584333-tr909-owners-stereo-out-less-bass-than-individual.html

MODIFICATION:

my version was build with addon second Noise source for fixing the loudness balance with snare and handclap

Gerber File v3 from Altitude :

https://www.e-licktronic.com/forum/viewtopic.php?t=837&start=70

1.Remove R208 on Mainboard

connect the Noise Out of the secondary Noise PCB to the R208 solder hole which is connected to C42and R209.
connect +15V power and GND to the Secondary noise PCB. you can steal it from the mainboard or PSU..

Bildschirmfoto 2026-02-12 um 12.10.41.png

MUX BOARD:

https://www.e-licktronic.com/forum/viewtopic.php?t=1549

IC111 an 114 need a milled pin socket or adapter

Nava 2: You must unsolder C517, C518, C519, C89 (BD), C163 (SD), C164 (LT), C165 (MT), C166 (HT), C167 (RS), C168 (HC)
If you have Nava v1.02 PCB go to step 3 those capacitors are not on the PCB (no further changes required)

power for the Dmux pcb comes from J15