Guide part 5 - low-pass filter

Various user-contributed guides for hardware-related things
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jhillman
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Guide part 5 - low-pass filter

Post by jhillman » Sat Oct 08, 2016 1:32 pm

I just completed part 5 of the guides including wiring things up to test the audio. The audio works, but coming out of the speaker, it is very quiet. I can hear it, but just barely. Does this indicate that there is something wrong with my filter? When I plug headphones in, the sound is much louder, but there is a lot of noise; I am new to emulators and all of this, so this might be normal. I haven't gotten to the part where I add a volume wheel, but that will just make it quieter, since it is adding resistance. Is all this normal? If not, what can I do to troubleshoot? Is there a way I can test my low-pass filter with a multimeter or something? I used a 10nF capacitor from the original Gameboy controller board rather than a 33nF, if that makes a difference (the guide says 10nF is fine).

Thanks!

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Re: Guide part 5 - low-pass filter

Post by Helder » Sat Oct 08, 2016 1:41 pm

Shouldn't this be in the General GBZ section and not the guides?

You will have to go into the Retropie settings and change the volume to max so it sounds louder, I also discovered that adding a 2.2uf or 4.7uf capacitor in series with the PWM Audio filters some of the fuzz.

There is also a line of code to put in the config.txt to help with static noise. Search the forum fot Audio Dither.
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Re: Guide part 5 - low-pass filter

Post by jhillman » Mon Oct 10, 2016 8:43 am

Thank you! Sorry for posting in the wrong place.

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