Oscillator buzz on macbook

Shintylla · Unread post by **Shintylla** » 03 Nov 2015, 21:31

Hi,
has anyone experienced interference buzz when touching trackpad or pressing keys when running the oscillator module?
Is this a problem of my laptop?
It happens with and without power supply.

Thx

sephult · Unread post by **sephult** » 03 Nov 2015, 22:46

No I do not have a problem with oscillator buzz, and use them all the time.
Is it your speakers you are overdriving or something mechanical?
Are you using the internal speakers, or an audio soundcard?

Sounds strange.
-s

nik_ost · Unread post by **nik_ost** » 04 Nov 2015, 11:15

I have buzz on oscillator module when tweaking frequency. some parasite components of sound appeared (at any waveforms).
it seems oscillators are too noisy in usine )

reaktor osc (saw):

usine osc (saw), same freq.

Shintylla · Unread post by **Shintylla** » 04 Nov 2015, 13:01

I'm using the laptop speakers.
I'll try with the soundcard

sephult · Unread post by **sephult** » 04 Nov 2015, 14:53

So I Saw what you were using and duplicated....bud dum chhhh.

I did not see the noise at a constant 600MHz using the band-limited.

Using the simple oscillator, yes I saw noise however around -47dB down, yes the bandlimited are much better.

I am not sure what version you are using, but there are bandlimited oscillators that sound much better and have a additional waveforms like triangle, and pink noise.

shintylla's problem is very strange though, sounds like a grounding problem almost.

-s

Shintylla · Unread post by **Shintylla** » 04 Nov 2015, 20:18

I'm using band limited with has no noise. Simple oscillator has noise around the same frequency you noticed.
Is my macbook? should I send it to assistance? Which kind of oscillator are better?
thx

sephult · Unread post by **sephult** » 04 Nov 2015, 22:05

The bandlimited are obviously the cleaner, however I sometimes like the simple oscillator just because I like distortion and noise. It's a preference thing.

As far touching the touch pad and keys and causing noise that is strange, I'd have to hear. Is it like humming noise? Do any other audio applications do this, like itunes then touching the keys cause noise?

-s

Shintylla · Unread post by **Shintylla** » 05 Nov 2015, 07:32

No,? I didn't hear from any other app. However is difficult to hear from a song instead of a simple oscillator.. I think I'll make a call to assistance service.
Any feedback from developers? Nay-Senso? Did you ever noticed this "noise"?
Thx sephult

YouTube · Unread post by **senso** » 05 Nov 2015, 08:13

from my point of view, your pb is not connected to Usine.
the oscillator module is at about 10000000 miles away from the track pad.

it's probably a simple ground buzz as 99% of PC computers.
just a small test: remove your AC adapter. the buzz should disappear.
senso+++

Unread post by **oli_lab** » 05 Nov 2015, 09:37

senso wrote:remove your AC adapter. the buzz should disappear.
senso+++

if it does, you can make a special AC adapter that lift the Earth OR make a special USB cable with no ground wire if you're using a usb soundcard.

buzz come from ground loop.

Shintylla · Unread post by **Shintylla** » 05 Nov 2015, 16:10

Sorry,
it doesn't disappear..
What is it? And for your point of view, is something I can explain to Apple technician as a disfunction to be repaired?

sephult · Unread post by **sephult** » 05 Nov 2015, 16:33

Shintylla, have you tried with an external soundcard yet as well? I didn't see any response regarding that.

What kind of noise is this? Does it radiate from your laptop or is it present in the audio signal?

drakh · Unread post by **drakh** » 06 Nov 2015, 10:17

oli_lab wrote:
senso wrote:remove your AC adapter. the buzz should disappear.
senso+++
if it does, you can make a special AC adapter that lift the Earth OR make a special USB cable with no ground wire if you're using a usb soundcard.

buzz come from ground loop.

yeh lifting the grounding wire works very well with ground loops, but. i will not recommend this to anyone. especially to whom are using full alu body

the ground wire has its purpose - if any electricity appears on the body connected to the grounding wire, the grounding wire is there for taking this electricity to the ground not to hurt anyone

if it is disconnected from the ground electricity stays in these parts which is really not good. In better cases it just damages the equipment in worst case scenario it damages the user.

So what to do with this...
1. the whole audio circuit should be connected to socket on the same phase (like on the stagesm lights are connected to different phase as PA, and your equip sould be on the same phase as PA)
2. just in case. use protected power cord splitters/extensions (that with glowing tube). the glowing tube protects the circuit from power peaks and works as filter as well.
3. find better power source for your notebook, soundcard etc. Some power sources are really bad shielded an are causing the hum
4. DI box!

you should have one

and regarding the problem,with the buzz. try to connect at least headphones, put the loudness of sound at maximum and use the touchpad. if you'l hear some nois ethat means something is bad with the sielding of the touchpad (some grounding connection is "broken"). there is probability that it induces to audio circuit always (but when you touch the touchpad, there is activity in the touchpad wires, so it appears just when you touch it) and you don't hear it and you will hear it just when your oscillator is playing some special frequency here interference between this frequency and induced signal appears as buzz

Shintylla · Unread post by **Shintylla** » 06 Nov 2015, 13:13

I 'll try with headphones.
There's something more: when I touch my laptop with feet on the ground( no sockets or shoes) and it is plugged into AC adapter I feel some electricity on the touching hand.
Maybe is my laptop..

Unread post by **SylvainT** » 06 Nov 2015, 16:47

Hello,

If you have some small electric chocs when you touch the laptop, the answer could be simple : the outlet (power socket ) you use at home is not grounded, not wired to earth.

Try an other outlet, one you are shure about earth. If the problem persist, maybe it's your AC adapter who have a problem of earth connection.

Regards

Sylvain

Shintylla · Unread post by **Shintylla** » 06 Nov 2015, 19:15

Ok , thanks for helping in figures this out guys

Unread post by **oli_lab** » 06 Nov 2015, 19:37

possibly, the titanium box is not grounded at all as the computer is powered by a isolated AC-DC wall wart.
(contrary to the PC tower that has to be grounded)

what you can try is to check with an Ohmmeter if the box is coonected to the ground tip of the computer power plug. (while it is off and not connected to the power grid)

and if not then use a crocodile clip on the box to connect to the earth plug

also all the audio chain must be powered from the same plug (not only the same phase)

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