• BD PCB silkscreen

TR909 clone nava

  • BD parts list

Let's continue with the bassdrum section. First add resistors. Do not pay attention of resistors type on the picture you certainly have differents resistors.

IMPORTANT for the mainboard v1.0l owner: refer to this TOPIC before to start this section. For the V1.01 owner connect a wire between P1 and P1'. For v1.02 owner no more mods is needed and C89 has been removed

nava tr 909 clone basdrum resistors

Add film capacitors

nava tr 909 clone bassdrum caps

Add electrolytics capacitors. Electrolytics capacitors are polarized, the long leg of the capacitors is the positive. Pay attention to orientation in which you solder electrolytics capacitors. The black part on the silkscreened electrolytic capacitor symbol is negative.

nava tr909 clone bassdrum electrolytic caps

Add diodes. Diodes are polarized, the black ring  must match the symbol silkscreened on the PCB.

nava tr 909 clone bassdrum diodes

Now, add transistors. Pay attention ! There are two different type of transistor: 2SA1115 and 2SC2603. Do not mix !

nava tr 909 clone bassdrum transistors

Now, check bassdrum section power voltages and add ICs. Do not overheat ICs pins during solder process !

nava tr 909 clone bassdrum ICs

Finally, add potentiometers. Pay attention to potentiometers value they are all different. Then bassdrum section is finished, let's go to the snaredrum section.

nava tr 909 clone bassdrum pots