All in One PCB Support Thread

[VeteranGamer]

Sorry for posting on the wrong topic, I hope i'm at the right place now :
I have a near silent audio problem ( http://www.sudomod.com/forum/viewtopic. ... 290#p27085 )

It's actually a documented problem with the first 2.2A boards and there is a simple fix of adding or replacing the 2 resistors to the right of the headphone socket with 75ohm resistors. Go have a look at my support thread 6 pages back from the last page for more information on it.

I didn't have 75ohm resistor and went for 100ohm ones. I then replaced R15 and R16 10Ohm by my 100ohm :

It didn't change audio's volume.
I then read on this topic that you have to meddle with R17 and R18, I changed them for 100ohm :

It didn't change audio's volume.
I clearly did something wrong or didn't understood something, can anybody please point me to the right direction ?
(I still have the 10ohm resistors if needed)

i'm having the same issue... replaced the resistors and the volume is still not on point....

its some consolation i'm not the only one, but it sucks that its an critical issue with this board apart from that i've had no other faults

its also a shame that apart from some advise helder hasnt offered a recall service for the boards that are effected, anywhere else and ppl would expect a refund or repair...

i'm still gonna persevere, but kites board seems like a far better option now

[Paddy]

Hi,

looks like that I have also a sound issue ... first of all I have received two boards both with the 6-pin headphone jack. I have bridged the pins as described in this thread but I have no audio:

1) audio is not working
2) audio is only working if my headphones are plugged (the sound is very static) ... also volume wheel is working

Any solution for this?

PS: I can hear somethink from the speaker but its only knick;knack

[Helder]

Try the following to clean the audio, and are you getting amplified audio through the headphones? Try to use a jumper wire from R15 and R16's right pads to Speaker -.

for all with static noise do it like me i postet some sites ago.

Twist a cable around pwm1 cable and 1 around the pwm0 cable.
this shielding cables go to One GND spot on Helders AIO Powerstrip and the other side to one of the Rasberry Pi GND Spot on GPIO Pins. and u will never have any static sound.

I have also done it with the 5 cabels of the volume Wheel like the PWM Cable

and i added to config.txt

Code: Select all

dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4 disable_audio_dither=1

it helps me alot with the cut sounds when i had 100% percent at volume inside retropie. with all that changes i have 0 static sound and 0 cut sound at 100% volume.

I also added the Visaton BF 32 speaker because it can handle 3W RMS 8 Ohms. Most of you use some 1/2W or 1W speaker but as i know the Amplifier produce 2Watt? right? so maybe this 1/2W or 1W speaker cant handle the Amplifier Output and that produce this cut sounds when 100%?

Also try this method if the above 2 didn't work:

Solution found!

Issue: Extremely choppy and quiet audio through speaker.

Solution: Added resistors as suggested by Helder which, instantly increased the volume and reduced the choppiness to a very playable level. No other steps were required apart from hookup as shown on Helder's wiring diagram and the config file, both of which are found on page 1 of this thread.

My setup: AIO 2.2A with 5 pin audio jack, Raspberry Pi v1.3, Adafruit Powerboost 1000C TPS61000, and 8 Ohm 1/2 Watt speakers https://www.amazon.com/gp/product/B00WW ... UTF8&psc=1

Parts Required: Two 75ohm 1/2 watt resistors, Three 1.5 inch long pieces of extra PWM or audio wire and a small piece of perf board.

Resistors from https://www.amazon.com/gp/product/B0002 ... UTF8&psc=1

To do:
Place resistors into the perf board parallel and adjacent to each other and solder the ends together on one side to make a U shape.
Solder a wire from the bottom of the U, on the side you just joined, to the Speaker - pad on the AIO.
On the other side of the perf board, solder a wire from the end of one resistor to the right side of R15.
Solder another wire from the end of the other resistor to the right side of R16.


Done

You do have extra perf board that you used for practice, right?!
For excellent soldering tips to protect your investment - http://www.sudomod.com/forum/viewtopic.php?p=21465

if PWM Audio is a big issue there is always a usb audio sound card solution which avoids the whole PWM coming from the Pi as an alternative.

[Boubobo]

Adventures of Boubobo in bodgeland

First, resoldering the 10Ω resistors back

Next, soldering my 100Ω (I don't have 75Ω 0806 resistor availble right now) on the right side of R17 and R18

Finaly a Wire from the right of the two 100Ω resistor to the + pad of the speaker


The sound isn't very loud (even with the potentiometer pads shorted, but it's acceptable.

[SumCanadianGuy]

Got it going. Found an old DELL multimedia keyboard in my garage that worked perfectly. Is there someplace I should document the model for others or do I just rejoice in my success lol.

Tell me the model and I'll post it in the first post.

DELL Model RT7D10

[mariovisic]

Hi Helder

Thanks for taking the time to answer all of our questions.

My AIO board came with a 6 pin headphone jack, no sound through the speaker, headphones work fine, also plugging in headphones and then removing them means the speaker works fine. Bridging the 6th pin on the jack had no effect.

Bridging the right sides of R15 and R16 to speaker minus (-) means the speaker works, but the volume is super low you can barely hear it compared to before. I have the PWM volume set to 100% (+4db) in the OS and have set the values in /boot/config.txt.

What's the best way to get it working at a reasonable volume, should I aim to get a hold of a 5 pin headphone jack? Or will leaving the R15+R16 bridge in place and changing resistor values be best?

[Helder]

Hi Helder

Thanks for taking the time to answer all of our questions.

My AIO board came with a 6 pin headphone jack, no sound through the speaker, headphones work fine, also plugging in headphones and then removing them means the speaker works fine. Bridging the 6th pin on the jack had no effect.

Bridging the right sides of R15 and R16 to speaker minus (-) means the speaker works, but the volume is super low you can barely hear it compared to before. I have the PWM volume set to 100% (+4db) in the OS and have set the values in /boot/config.txt.

What's the best way to get it working at a reasonable volume, should I aim to get a hold of a 5 pin headphone jack? Or will leaving the R15+R16 bridge in place and changing resistor values be best?

What are the values there now? Anything too high lowers the volume, using 75 ohms or lower like 56 ohm or so will increase the volume. So you have audio going to the speaker with the 6 pin socket or not? I can send you the correct 5 pin socket if you'd like just send me a pm with your shipping info.

[mariovisic]

Mulitimeter says 10.4ohm for R15 and R16

So you have audio going to the speaker with the 6 pin socket or not?

Kind of... without modifying the board I only get audio on the speakers if I plugin something to the 3.5mm jack and then remove it. When I do that I get a good volume sound from the speakers. There is some noise but it sounds like I should be able to address that by wrapping a ground wire around the PWM cables.

If I add a wire from the right hand side of R15 and R16 to the speaker minus (-) then I do get sound to the speaker without having to plug and unplug something into the 3.5mm jack, but now the volume is very very low; although the noise is entirely gone.

I did bridge the two pins on the 6 pin jack already.

Can I simply change R15/R16 to 3.3 or 5 ohm resistors? Should the volume increase linearly with the change?

[Helder]

If you don't get clipping in audio then you can try a lower value than 10ohms to see if it helps.

[Mischief]

Adventures of Boubobo in bodgeland

I did this and it helped a lot, R15, R16, R17 and R18 are now 10ohm and I have 2 100ohm in the same way as above and it has boosted the speaker volume and I get less audio cut out on the games I had issues with, still not as loud as I would like so I will be buying some 75ohm and 56ohm 0805 resisters to replace the 100ohm (trying the 75ohm first) and will see if that boosts it further.