Hello, I posted on the main page for the audio circuit and was told to post in here, so I've made some changes and I'll be sure to include a lot more info and context about what I'm doing. I'm sure I've just misinterpreted something here, as I'm not very well-versed in this kind of thing, so please bear with me.
So, first thing's first, if you take a look at the pic I've included below, you'll see that I'm not making a PSPi, I'm making more of a SNESPi. This is a mod of an SNES controller which turns it into a self-contained console which hooks up to your TV via the RCA inputs on your TV. It includes a 650mAh 3.7 volt LiPo battery, a USB charging circuit, on-off switch, and a Raspberry Pi Zero which I can hopefully get to output some sound. Everything else is currently working, the Pi boots up into RetroPi and I'm able to control it using either the controller's buttons or a wireless KB/M, which is why there's a dongle sticking out of it.
The problem I'm having right now is that when I plug in the audio cables (red and white), I lose video output completely. I just want to make sure I have things wired correctly, so there's a pic below showing how I've done it, and I'll explain further as well, using the numbers labeled on it.
1.) Here, the PWM 18 and 13 pins come into the hi/low pass filter. I used ground pin 5, which I believe should be okay.
2.) The Left, Right, and ground pins come out from the filter and go to the amplifier board (3).
4.) The 5v pin is attached straight from the on-off switch of the pi. The negative is soldered to the ground pin on square(3).
5.) This is where my problem happens. If I don't have the ground pin on either side occupied, I get video. If I put the ground wires from the TV into either of the ground wires here, the video is immediately lost, which is very odd.
So, that's what I have so far. Sorry if this is too convoluted, but hopefully you can see where I have messed up.
5.) This is where my problem happens. If I don't have the ground pin on either side occupied, I get video. If I put the ground wires from the TV into either of the ground wires here, the video is immediately lost, which is very odd.
So, that's what I have so far. Sorry if this is too convoluted, but hopefully you can see where I have messed up.
Based off your description, it seems like you're connecting the teal wires to ground. If so, then that's what's wrong. Those are not ground pins, they are only meant to be connected to a speaker.
L+ is left speaker positive
L- is left speaker negative (not the same as the ground on the Pi)
R+ is left speaker positive
R- is left speaker negative (again, not the same as the ground on the Pi)
Sorry, it looks like I mixed up my description then. I am doing what you said, where the teal wires are the negative wires going out to the speakers, or in this case my TV.
So, to clarify, at number 5, the R-, R+ and L-, L+ are all going out to the speakers, or in my case, the TV.
Thanks a lot for having a look, let me know if there's something else that seems odd to you.
When you say TV, does that mean you're wiring them to the RCA audio inputs on the TV?
Yes,I'm trying to get it to output sound to my TV using the red/white cables along with video on the yellow one.
Ok that's the problem. Get rid of the teal wires entirely.
This should work:
Attach the L+ to the center pin of the RCA cable and attach ground to the outer connection of the RCA cable. Don't use L- at all. You're shorting out everything by applying voltage to a connection that should go to ground (L- is not ground, it is getting voltage).
Do the same thing with R+ on the other RCA cable. Get rid of R-, just use a ground for the negative side.
That's the ticket! My controller is now making sweet, sweet noises! Thanks, I'm going to try and dig out a 100 ohm resistor and cut some fuzz back, but it looks like it's all working.
Thanks a ton!
