Nava TR-909 Clone

Project

Projecttitel:Nava TR-909 Clone

Status: FINISHED

Startdate: 01. May 2016

Duedate: July 2016

update march 2017

update Jun 2017

Manufacture link: http://www.e-licktronic.com/en/nava-parts-kit/50-nava-tr909-clone.html

Table of Contents

BOM: v1.0

Bugs

update the Firmware 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

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

MUX BOARD:

http://www.e-licktronic.com/en/nava-parts-kit/57-mux-sh-boards.html

Bill of Materials from S_H Board v1.00.sch, 16 parts, grouped by values, as of 26/09/2017 10:33:34

Part	Value	Device	Package	Description	Qty
C1, C2, C3, C4, C5, C6, C7, C8	470p	C-EUC0805	C0805	CAPACITOR, European symbol	8
C9, C10	100n	C-EUC0805	C0805	CAPACITOR, European symbol	2
IC1	4051A	4051A	DIL16-S	8-channel ANALOG MULTIPLEXER	1
IC2	4051D	4051D	SO16	8-channel ANALOG MULTIPLEXER	1
IC3, IC4	TL074D	TL074D	SO14	OP AMP	2
J1, J2		MA03-1	MA03-1	PIN HEADER	2