USB audio problem

print (sudo) · Post by **print (sudo)** » Fri Dec 09, 2016 4:54 am

Hello, I'm having trouble with getting USB audio to work. I don't know what I'm doing wrong so if anyone could help me that would be great.
I'm a newbie at electronics...

Thanks.

~print

fcib · Post by **fcib** » Fri Dec 09, 2016 5:00 am

print (sudo) wrote:Hello, I'm having trouble with getting USB audio to work. I don't know what I'm doing wrong so if anyone could help me that would be great.
I'm a newbie at electronics...

Thanks.

~print

Hello, I'm having trouble flying my rocket ship to mars. I don't know what I'm doing wrong so if anyone could help me that would be great. I'm a newbie at space travel...

Now you understand why details of the problem are important so please give us some.

print (sudo) · Post by **print (sudo)** » Fri Dec 09, 2016 5:04 am

fcib wrote:
print (sudo) wrote:Hello, I'm having trouble with getting USB audio to work. I don't know what I'm doing wrong so if anyone could help me that would be great.
I'm a newbie at electronics...

Thanks.

~print
Hello, I'm having trouble flying my rocket ship to mars. I don't know what I'm doing wrong so if anyone could help me that would be great. I'm a newbie at space travel...

Now you understand why details of the problem are important so please give us some.

Yeah sorry, there is no audio

fcib · Post by **fcib** » Fri Dec 09, 2016 5:17 am

print (sudo) wrote:
fcib wrote:
print (sudo) wrote:Hello, I'm having trouble with getting USB audio to work. I don't know what I'm doing wrong so if anyone could help me that would be great.
I'm a newbie at electronics...

Thanks.

~print
Hello, I'm having trouble flying my rocket ship to mars. I don't know what I'm doing wrong so if anyone could help me that would be great. I'm a newbie at space travel...

Now you understand why details of the problem are important so please give us some.
Yeah sorry, there is no audio

Well, I would check first:
-does the USB sound card show up in a PC or on the pi when plugged in?
-Try connecting the L+R to one side of the speaker and ground to the other side, without the amp, potentiometer, headphonejack to test if it works before adding the other wiring
-Is your potentiometer wired correctly (may not be same type/model as diagram)

Then we can continue troubleshooting. Good luck

print (sudo) · Post by **print (sudo)** » Fri Dec 09, 2016 5:44 am

fcib wrote:
print (sudo) wrote:
fcib wrote:
Hello, I'm having trouble flying my rocket ship to mars. I don't know what I'm doing wrong so if anyone could help me that would be great. I'm a newbie at space travel...

Now you understand why details of the problem are important so please give us some.
Yeah sorry, there is no audio
Well, I would check first:
-does the USB sound card show up in a PC or on the pi when plugged in?
-Try connecting the L+R to one side of the speaker and ground to the other side, without the amp, potentiometer, headphonejack to test if it works before adding the other wiring
-Is your potentiometer wired correctly (may not be same type/model as diagram)

Then we can continue troubleshooting. Good luck

Thanks, the sound card is being picked up by the PC, the speaker works with the L±R wired up
I don't know how to wire up the potentiometer though...
It's a B103.

Thanks again

TimBer · Post by **TimBer** » Fri Dec 09, 2016 6:37 am

Looking at your wiring, you wired + and - of the left channel into both inputs of the pot.

You only need to wire the + into the pot (and of course the ground as well). (Your audio will be mono). Or add the + of the right channel to the pot as well.

From your picture I would say, from left to right:

1. ground
2. first output
3. second output
4. second input
5. first input

Not sure about the output / input ordering......I'll check my wiring when I'm at home

print (sudo) · Post by **print (sudo)** » Fri Dec 09, 2016 7:24 am

TimBer wrote:Looking at your wiring, you wired + and - of the left channel into both inputs of the pot.

You only need to wire the + into the pot (and of course the ground as well). (Your audio will be mono). Or add the + of the right channel to the pot as well.

From your picture I would say, from left to right:

1. ground
2. first output
3. second output
4. second input
5. first input

Not sure about the output / input ordering......I'll check my wiring when I'm at home

I'm confused... Diagram?

TimBer · Post by **TimBer** » Fri Dec 09, 2016 7:51 am

Something like this. I do not know your audio jack wiring.
But again....I will check my exact wiring this evening (4 to 5 hours from now for me

: schema.png (54.62 KiB) Viewed 9668 times

print (sudo) · Post by **print (sudo)** » Fri Dec 09, 2016 7:59 am

TimBer wrote:Something like this. I do not know your audio jack wiring.
But again....I will check my exact wiring this evening (4 to 5 hours from now for me
schema.png

Thanks.
Full thread is here : http://www.sudomod.com/forum/viewtopic.php?f=22&t=701
Thanks to Fleder for the IMG

TimBer · Post by **TimBer** » Fri Dec 09, 2016 12:37 pm

Just found out I'm using a B503....not a B103......not sure if they are compatible....but for the schema:

: schema.png (116.48 KiB) Viewed 9658 times

Note that you can combine the output to the speaker for both channels (you need an additional schema with additional resistors for that) ....for simplicity....I just connected one channel.

see: http://www.sudomod.com/forum/viewtopic. ... 261#p12261 for wiring stereo to the speaker

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