Author Topic: Yellow OLED : high frequency solution  (Read 2915 times)

Xavier

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Re: Yellow OLED : high frequency solution
« Reply #15 on: September 13, 2016, 11:13:33 PM »
Without the modification described in this thread., some people hear this peak.
As you use PCB R5d you already have step 1,2,3 done by just soldering the 22ohm OLED resistor, so the peak is smaller that it was on PCB R5c.
If you make a shield as described it will be even smaller.

kylelandstra

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Re: Yellow OLED : high frequency solution
« Reply #16 on: January 31, 2017, 05:09:18 AM »
Just a quick question on the aluminum shield mod:  Do you just stuff the bag between the OLED screen and the PCB?  Do you secure it all?  Is it okay if the bag is touching the board?

Xavier

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Re: Yellow OLED : high frequency solution
« Reply #17 on: February 01, 2017, 10:06:57 AM »
Just a quick question on the aluminum shield mod:  Do you just stuff the bag between the OLED screen and the PCB?  Do you secure it all?  Is it okay if the bag is touching the board?

As far as only plastic touch the board it's totally OK.

mmontag

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Re: Yellow OLED : high frequency solution
« Reply #18 on: February 13, 2017, 11:05:04 PM »
I definitely noticed the squeak after upgrading to OLED, but the shield fix was easy and effective. No extra soldering needed with the recent board revisions. Thanks Xavier.

 :D

served

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Re: Yellow OLED : high frequency solution
« Reply #19 on: May 24, 2017, 12:38:39 PM »
Hi.

We have now had some time to test the noise issues.

Some remarks:
We have tested various inductors, to look for a low-noise unit that may have some better characteristics. No success in practice.

We have stopped producing and adding the metal sheet behind the screen. It shields the noise from the audio, but produces a new issue. Physical noise in the unit.

So the new Rev2 solution is a Aliuminium tape + coppertape with soldered cable and grounded + Plastic tape for isolation.
A Grounding cable will give you better shielding properties.

We are now basically following Xavier solution except added a GND cable.