[GUIDE] Wiring Diagrams: all-in-one board, graceful shutdowns, audio-only board

[jeffy1021]

How would that work exactly? The reason he wants to combine the 2 outputs is to have a muxed left and right channel into the mono speaker. The speaker will sound like shit without the amp, if we tap into the audio as you say then we're bypassing the filter and amp.

The audio would still go through the filter and amp, but the channels would just be combined first.

[Helder]

How would that work exactly? The reason he wants to combine the 2 outputs is to have a muxed left and right channel into the mono speaker. The speaker will sound like shit without the amp, if we tap into the audio as you say then we're bypassing the filter and amp.

The audio would still go through the filter and amp, but the channels would just be combined first.

wouldn't it be better after the pot or even before? either way it's a good test to do in all different configurations.

[slicknick654]

*Newbie Question*

Can someone explain what these 2 transistors/resistors do and where I can find them if possible?

http://imgur.com/a/8WRhy
*Cant figure out how to post actual pic

[jeffy1021]

How would that work exactly? The reason he wants to combine the 2 outputs is to have a muxed left and right channel into the mono speaker. The speaker will sound like shit without the amp, if we tap into the audio as you say then we're bypassing the filter and amp.

The audio would still go through the filter and amp, but the channels would just be combined first.

wouldn't it be better after the pot or even before? either way it's a good test to do in all different configurations.

Everything I've read online said to combine the channels before they are amplified (line level). I'll definitely test it on a breadboard first once I find four matching resistors out of my pile.

[Camble]

*Newbie Question*

Can someone explain what these 2 transistors/resistors do and where I can find them if possible?

http://imgur.com/a/8WRhy
*Cant figure out how to post actual pic

I believe that is for the low battery monitor.

[SidSilver]

The audio would still go through the filter and amp, but the channels would just be combined first.

wouldn't it be better after the pot or even before? either way it's a good test to do in all different configurations.

Everything I've read online said to combine the channels before they are amplified (line level). I'll definitely test it on a breadboard first once I find four matching resistors out of my pile.

If you do that the headphones would be mono right and mono left. I think it also works after the amp.

[jeffy1021]

wouldn't it be better after the pot or even before? either way it's a good test to do in all different configurations.

Everything I've read online said to combine the channels before they are amplified (line level). I'll definitely test it on a breadboard first once I find four matching resistors out of my pile.

If you do that the headphones would be mono right and mono left. I think it also works after the amp.

It's kind of ambiguous because all the examples I found mention using line level (pre-amplified) audio. But at the same time, I did not find anything that said "Don't use a summing circuit on amplified audio or else you'll break stuff". I'll probably try it both ways and see what happens. I have an extra speaker at least.

[Mcurry2089]

I'm sure this is somewhere on the forum but I've been having trouble finding it and have found some examples of code that might be what I'm looking for. I just wanted to check and make sure before I got in too deep. Can anyone link me to the coding required for the GPIO pins for the graceful shutdowns?

[a3k4]

I'm sure this is somewhere on the forum but I've been having trouble finding it and have found some examples of code that might be what I'm looking for. I just wanted to check and make sure before I got in too deep. Can anyone link me to the coding required for the GPIO pins for the graceful shutdowns?

See @Popcorn's code on Github

[jeffy1021]

Everything I've read online said to combine the channels before they are amplified (line level). I'll definitely test it on a breadboard first once I find four matching resistors out of my pile.

If you do that the headphones would be mono right and mono left. I think it also works after the amp.

It's kind of ambiguous because all the examples I found mention using line level (pre-amplified) audio. But at the same time, I did not find anything that said "Don't use a summing circuit on amplified audio or else you'll break stuff". I'll probably try it both ways and see what happens. I have an extra speaker at least.

I used two 1k resistors to combine the amplified output and it was really soft. The smallest resistor I could find in my spare part box was 100 ohm and the volume was usable, but still noticeably softer than a straight single channel. The pot and emulationstation are at max volume. I may just go back to a mono speaker and use headphones if there is a game where stereo sound actually makes a difference in playability, we'll see..