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  • SD PCB silkscreen

TR909 clone Nava

  • SD parts list

Nava tr909 clone

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

nava tr909 clone snaredrum resistors

Add film capacitors. On v1.02 mainboard C163 has been removed.

For v1.02 builder, you must add a 1Mohm resistor across C83 on the bottom side of the PCB like describe on this topic. This prevent too long snare tone decay issue.

nava tr909 clone snareDrum cpas

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

nava tr 909 clone snaredrum electrolytic caps

Add diodes. Diodes are polarized, the black ring must match the symbol silkscreened on the PCB. D57 is a 1N4746 this is the only one, take care !

nava tr 909 clone snaredrum diodes

Now, add transistors. Pay attention! There are two different type of transistor: 2SA1115 and 2SC2603. Do not mix ! Pay attention to the orientation in which you solder Q47 and Q48. 2SD1469 marker have to match with the symbol black part silkscreened.

IMPORTANT for the mainboard v1.0l owner : Q43 Q46 and Q49 have to be solder with pin 1 and 2 reversed like describe in this topic

nava tr 909 clone snaredrum transistors

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

Nava tr 909 clone snaredrum ICs

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

nava TR 909 clone snaredrum Pots