Volume pot turned all the way down but sound still a little loud
- tinkerBOY
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Volume pot turned all the way down but sound still a little loud
While waiting for the USB sound card i thought i could setup another pi to test/improve the mono PWM audio i used on my first build. This time im using no low/high pass filter. Just the audio amp(PAM8302A) directly connected to the pi zero's GPIO 18. To my surprise it sounded great and can't seem to hear any difference from my first build with filter.
I made another change by placing the volume pot between the pi's gpio18 and the audio amp which i think is a good practice. The only problem is, the sound is still a little loud even if the volume pot is turned all the way down. Maybe im doing it the wrong way. Im not sure.
Any help or input is welcome and will be very much appreciated! Thank you!
Update:
It looks like the PAM8302A doesn't need any filter after all.
I made another change by placing the volume pot between the pi's gpio18 and the audio amp which i think is a good practice. The only problem is, the sound is still a little loud even if the volume pot is turned all the way down. Maybe im doing it the wrong way. Im not sure.
Any help or input is welcome and will be very much appreciated! Thank you!
Update:
It looks like the PAM8302A doesn't need any filter after all.
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- Lphillimore
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Re: Volume pot turned all the way down but sound still a little loud
Where is the ground for your vol pot? Add that and re-test.
Minimum you'll need is GND, L or R channel IN and corresponding channel out.
Minimum you'll need is GND, L or R channel IN and corresponding channel out.
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Re: Volume pot turned all the way down but sound still a little loud
Im not sure what you mean by GND for VOL. I'm using a 3-legged pot. Can you elaborate please?Lphillimore wrote: ↑Thu Jul 27, 2017 11:19 pmWhere is the ground for your vol pot? Add that and re-test.
Minimum you'll need is GND, L or R channel IN and corresponding channel out.
On the back of the board, GND and A- are jumper wired connected.
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Re: Volume pot turned all the way down but sound still a little loud
3 Pin volume pots still have a GND, In and Out.zeroboy wrote: ↑Thu Jul 27, 2017 11:34 pmIm not sure what you mean by GND for VOL. I'm using a 3-legged pot. Can you elaborate please?Lphillimore wrote: ↑Thu Jul 27, 2017 11:19 pmWhere is the ground for your vol pot? Add that and re-test.
Minimum you'll need is GND, L or R channel IN and corresponding channel out.
On the back of the board, GND and A- are jumper wired connected.
For any builds I've done ive used 5 pin pots, which have dual in and out channels. Still need to wire up GND though
If its a B103 the pinout should follow the 5 Pin.
You have wired your IN and OUT on vol pot but nothing attached to ground.
If you add this, you should find it works...
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Re: Volume pot turned all the way down but sound still a little loud
Thank you! i got it working.Lphillimore wrote: ↑Thu Jul 27, 2017 11:55 pm3 Pin volume pots still have a GND, In and Out.zeroboy wrote: ↑Thu Jul 27, 2017 11:34 pmIm not sure what you mean by GND for VOL. I'm using a 3-legged pot. Can you elaborate please?Lphillimore wrote: ↑Thu Jul 27, 2017 11:19 pmWhere is the ground for your vol pot? Add that and re-test.
Minimum you'll need is GND, L or R channel IN and corresponding channel out.
On the back of the board, GND and A- are jumper wired connected.
For any builds I've done ive used 5 pin pots, which have dual in and out channels. Still need to wire up GND though
If its a B103 the pinout should follow the 5 Pin.
You have wired your IN and OUT on vol pot but nothing attached to ground.
If you add this, you should find it works...
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- firestw152
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Re: Volume pot turned all the way down but sound still a little loud
Update:
It looks like the PAM8302A doesn't need any filter after all.
[/quote]
So the filter is not needed at all? Man I would have loved to know that sooner before I spent all that money on the resistors and capacitors.
It looks like the PAM8302A doesn't need any filter after all.
[/quote]
So the filter is not needed at all? Man I would have loved to know that sooner before I spent all that money on the resistors and capacitors.
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Re: Volume pot turned all the way down but sound still a little loud
yeah me too. I actually have assembled some filters.. but looks like i don't need them anymore.firestw152 wrote: ↑Mon Jul 31, 2017 9:46 pmUpdate:
It looks like the PAM8302A doesn't need any filter after all.
So the filter is not needed at all? Man I would have loved to know that sooner before I spent all that money on the resistors and capacitors.
Last edited by tinkerBOY on Mon Jul 31, 2017 11:46 pm, edited 1 time in total.
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Re: Volume pot turned all the way down but sound still a little loud
yeah me too. I actually have assembled some filters.. but looks like i don't need them anymore.zeroboy wrote: ↑Mon Jul 31, 2017 9:57 pmSo the filter is not needed at all? Man I would have loved to know that sooner before I spent all that money on the resistors and capacitors.firestw152 wrote: ↑Mon Jul 31, 2017 9:46 pmUpdate:
It looks like the PAM8302A doesn't need any filter after all.
[/quote]
hey one more question do you have the radioshack 5 pin jack for the headphones? If you do, do you have a picture of the wiring. Or know of a schematic somewhere because I am having serious problems trying to get audio to work on retropie. I have tried both USB and gpio audio and none of them work correctly.
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Re: Volume pot turned all the way down but sound still a little loud
Guys, checkout PWM2 - it's in the early stages but seems to be a massive improvement and negates the need for heavy filtering etc.
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Re: Volume pot turned all the way down but sound still a little loud
Wait im sorry im not informed enough to know what that is, is it like another type of amp? Can I get a link to read what it is.Lphillimore wrote: ↑Mon Jul 31, 2017 10:15 pmGuys, checkout PWM2 - it's in the early stages but seems to be a massive improvement and negates the need for heavy filtering etc.
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