Guide part 5 - low-pass filter

Various user-contributed guides for hardware-related things
Post Reply
jhillman
Posts: 10
Joined: Sat Oct 08, 2016 1:23 pm
Has thanked: 4 times

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!

User avatar
Helder
Trailblazer
Trailblazer
Posts: 2985
Joined: Thu May 05, 2016 8:33 am
Location: Rogers, AR
Has thanked: 1459 times
Been thanked: 3113 times

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.
Chat with me and other members On Discord

Don't contact me about obtaining my board files (as you will not get them). If my Boards or PCB Kits are sold out, they will be restocked as soon as I can get them and there is demand for them. You can join the mailing list on my Website to be notified when they are available.


Helder's Game Tech Website

We will not support any cloned work so don't come to us with technical issues to resolve, go talk to the cloner for help.

jhillman
Posts: 10
Joined: Sat Oct 08, 2016 1:23 pm
Has thanked: 4 times

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.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest