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  • Noise PCB silkscreen

TR909 clone nava

  • Noise parts list

TR909 clone Nava

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

nava tr 909 clone noise resistors

Add film capacitors

nava tr 909 noise capas

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.
RPxx resistors are power resistors. You can use a components leg or a 0ohm resistor which acts as a fuse.

nava tr 909 noise electrolytic caps

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

nava tr 909 clone noise diodes

Now, plug power supply and check noise section voltage. Power symbol are silkscreened on the bottom for each ICs. (a square is +15V and a round is -15V).

nava tr 909 clone noise test +15v

nava tr 909 clone noise test -15v

Unplug your PSU and add ICs. Do not overheat ICs pins during solder process !

nava tr 909 clone noise Ics

Finally, plug your PSU and test Noise out with a Headphone, scope or speakers on IC33 pin 9. Then noise section is finished, let's go to the bassdrum section Booooommmm :)

nava tr 909 clone noise test

nava tr 909 clone noise oscilloscope