PreenFM > preenfm2 and preenfm3

Vishay OLED brightness

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ym2612:
Hi all,

I'm building a PreenFM2 and I chose a Vishay OLED from Mouser for its white text display. https://www.mouser.com/search/ProductDetail.aspx?r=78-020N004AWPP5N0000

It works, and text is visible, but it's quite dim compared to photos I've seen of the yellow OLED. I soldered a jumper for the OLED resistor and verified that 5V is being delivered to the display (which is what the supply voltage is rated at). Is there a modification I can make to increase the brightness of the display?

FWIW, so far I hear no extra noise.

ym2612:
Also, I should mention that the Vishay display is slightly too thick to fit behind the acrylic screen protector included with the metal case.

Xavier:

Thanks for the feedback about this display.
A jumper for the OLED resistor was the way to go if your display is not bright enough.
I don't think there is other thing you can do.

Do you have a picture of it ? that reflects the brightness you see.

For the noise, you have to put a spectrum analyser (http://www.voxengo.com/product/span/) to be sure it does not add any noise at any frequency. Most of us don't hear the 13.5Khz peak of the yellow display.
Would be great to view what is the spectrum of you audio output with the preenfm2 switched on.

Xavier

ym2612:
Sorry for the delay on these images. I took screenshots in a spectral analyzer for iPad.

Vishay display (clickable image):


Yellow OLED (no shield):


Yellow OLED (homebrew aluminum foil shield):


As you can see, the noise spike is still very present and audible even with the shield I made, so hopefully I can make another display work or fabricate a better shield.

ym2612:
Here are some photos of the Vishay display plugged in:

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