[solved] Bass Drum BUZZZ

Discuss Nava construction and related issues

Re: Bass Drum BUZZZ

Postby FUNKflasher » Aug 10th, '16, 21:24

decoder303 wrote:Thx for sharing this info Funkflasher and also thanks to Redstorm.

Just to add, my Nava is dead silent, it's just the BD for me that has the issue with hum / noise.


As mine original TR-909 dead silent S/N ratio except Bass Drum, and as I asked before do you hear noise variations while changing TEMPO POT???
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Re: Bass Drum BUZZZ

Postby drifter7508 » Aug 10th, '16, 21:27

So, can anyone just try to bend pin3 and connect a wire to the psu boards gnd and see if it helps? :-)

(I'll check the tempo decoder tomorrow and find a ul for the wav)
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Re: Bass Drum BUZZZ

Postby decoder303 » Aug 11th, '16, 09:46

FUNKflasher wrote:
decoder303 wrote:Thx for sharing this info Funkflasher and also thanks to Redstorm.

Just to add, my Nava is dead silent, it's just the BD for me that has the issue with hum / noise.


As mine original TR-909 dead silent S/N ratio except Bass Drum, and as I asked before do you hear noise variations while changing TEMPO POT???


Hi, no noticeable variation when changing the tempo.
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Re: Bass Drum BUZZZ

Postby peskado » Aug 11th, '16, 13:37

drifter7508 wrote:So, can anyone just try to bend pin3 and connect a wire to the psu boards gnd and see if it helps? :-)

(I'll check the tempo decoder tomorrow and find a ul for the wav)

I tried it, i also tried move out opamp with q12 Q6 and Volume pot
No changes
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Re: Bass Drum BUZZZ

Postby drifter7508 » Aug 11th, '16, 14:47

:( ... oh, a shame it did not work. Thanks for testing it out!
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Re: Bass Drum BUZZZ

Postby drifter7508 » Aug 14th, '16, 14:17

Seems that most of the noiselevel is coming from the bassdrum section. With the bassdrum volume down to zero, the rest of the output is way more silent.
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Re: Bass Drum BUZZZ

Postby drifter7508 » Aug 14th, '16, 19:01

Buzz from my BD:
BD volume at 100%
Main out at 60%

https://www.dropbox.com/s/14f6a70too20u ... z.wav?dl=0
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Re: Bass Drum BUZZZ

Postby decoder303 » Aug 14th, '16, 21:28

it's the same like the OP and me have..
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Re: Bass Drum BUZZZ

Postby e-licktronic » Aug 22nd, '16, 08:32

Dear Diyer,

We are working on this bassdrum Buzz issue.
Here is the work we done without success unfortunately:

-De-solder Q12 and Q6 to isolate the buzz. So it come from IC11A
-Tried to connect IC11 Pin3 to PSU ground and others ground points.
-Tried to cut some traces to prevent ground loop
Image

-Cut +15V traces between IC13 and IC11 cause this via is very close to IC11 Pins and replace it with a wire.
Image

-Unplug sequencer PSU

PCB layout are available here: Top layer and Bottom layer and in the download section on Nava v1.0 product page.

We are still working on it, your help will be great appreciate.
Best regards,
e-licktronic
Best regards,
e-licktronic
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Re: Bass Drum BUZZZ

Postby AonFluX » Aug 22nd, '16, 11:48

Great that we now have the traces. And good work on trying to get to the bottom with this!
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