Pwm audio

[rodocop]

It's just a common ground board, but it has added routing for audio and power to pass through. but does nothing other than buttons presses. I typically don't use those amps, and when I do, I always use mono anyway. So Correia may be right, in that they just don't like to be bridged.

[correia5022]

in the photo you send, the wiring is correct.

What you can do to get stereo to mono speaker, is wire a 1k ohm from each L and R of the button pcb to meet the Lin of the amp. then wire the speaker to the L out

L--<1k>------- Lin (amp)
|
R--<1k>-|

[correia5022]

It's just a common ground board, but it has added routing for audio and power to pass through. but does nothing other than buttons presses. I typically don't use those amps, and when I do, I always use mono anyway. So Correia may be right, in that they just don't like to be bridged.

Maybe i am mistaken, but the photo sugests a aio board (because of the layout):
https://glitchdgaming.com/index.php/shop/

Neverdeless, its not the point here...
EDIT Actually it has... you are using the pwm without lowpass filter? It can happen that the voltage was too much that when you bridged the output on the amp, you fried it..

Here's another explanation on that:

SpoilerShow

If PWM is used for audio output then there is a DC component to the output, that is, if the PWM output is alternating between 0 and 3.3 V, the average "no sound" voltage is 1.65 V which will waste power, needlessly heat up the output device, and possibly cause distortion. Thus a DC blocking capacitor (high pass filter) makes sense.

PWM produces an "analog" output by switching rapidly between fully on and fully off with varying duty cycle. This produces undesired high frequency components at and above the switching frequency. A low pass filter will attenuate these frequencies.

source:
https://www.raspberrypi.org/forums/view ... p?t=158264

Here's an explanation on the pam8403

SpoilerShow

PAM8403(H) has 2 amplifier stages inside. Each one is bridge type, in order to apply the maximum (rail to rail) voltage to the loudspeaker. So, if you tie together the amplifiers outputs thinking to double output power with the same loudspeaker, you are out of way. So doing you'll have double current capabilities only and you'll have to half loudspeaker impedance (I say 2ohm) in order to obtain more output power.
Anyway you'll have a problem: if the amplifier have different duty cycles (also slight) we'll have a current circulating between the outputs stages and this is evident measuring the current consumption without signal. This will increase power dissipation, lower the efficiency and potentially fail your device.

source:
https://www.diyaudio.com/forums/class-d ... nnels.html

[Robochris]

heres the funny thing, I got fed up and put helders aio back in it.. now its perfectly fine.... a day and a half wasted.
Oh well.

[Robochris]

So, I guess the problem is solved.

Edit: I take that back. Still getting multiple button presses every-so-often. It’s extremely frustrating when playing menu based rpgs.

If anyone has any suggestions please let me know.

[correia5022]

So, I guess the problem is solved.

Edit: I take that back. Still getting multiple button presses every-so-often. It’s extremely frustrating when playing menu based rpgs.

If anyone has any suggestions please let me know.

Well, probably there was a problem with the common ground board in the pwm traces...

As for the Helder AIO, try sending him a mesage. Is it the AIO 2.2? Maybe trying to reprogram the atmega adding some delay after pressing a key..

[Robochris]

So, I guess the problem is solved.

Edit: I take that back. Still getting multiple button presses every-so-often. It’s extremely frustrating when playing menu based rpgs.

If anyone has any suggestions please let me know.

Well, probably there was a problem with the common ground board in the pwm traces...

As for the Helder AIO, try sending him a mesage. Is it the AIO 2.2? Maybe trying to reprogram the atmega adding some delay after pressing a key..

I’ve been through all that. I’ve reached out to him before and he just directs you to the forum about reprogramming his board. When I did reprogram, it did help. But not 100%. It just doesn’t feel like a controller.

The common ground board felt fine but the audio wouldn’t work. I think I’ll end up building a new one from scratch.

[Robochris]

It's just a common ground board, but it has added routing for audio and power to pass through. but does nothing other than buttons presses. I typically don't use those amps, and when I do, I always use mono anyway. So Correia may be right, in that they just don't like to be bridged.

Which amps do you prefer?
I got a small pack of these pretty cheap but never really had success with them. Maybe that’s the root of my problem. I used an adafruit amp once (it was purple so I don’t really know if it was authentic) but I didn’t have very good results with that one either.

[rodocop]

I just use the adafruit pam8403 ones (blue ones). Still not great, but I found them to be better than the cheapo green amps. But lately I've been using i2s. Little pricey. But quality is amazingly better.

https://learn.adafruit.com/adafruit-max ... d-mono-amp

[correia5022]

I just use the adafruit pam8403 ones (blue ones). Still not great, but I found them to be better than the cheapo green amps. But lately I've been using i2s. Little pricey. But quality is amazingly better.

https://learn.adafruit.com/adafruit-max ... d-mono-amp

Yeah, these look really great, because its aio, but i think they dont fit if you want to use headphones.

I bought the pam8302, its mono amp.
https://pt.banggood.com/CJMCU-832-PAM83 ... 03106.html

Also i'm expecting some PCM DAC boards to attach the mono amp
https://pt.aliexpress.com/item/Interfac ... 46058.html