C2 Audio Oupute Noise Problem

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C2 Audio Oupute Noise Problem

Unread postby sbynkln » Mon Apr 30, 2018 5:41 pm

Hello,
I have installed android 5.1.1(v3.5) to odroid c2 micro sd card. Then tried to listen sound output from:

1. I2S 2Watt Stereo Boom Bonnet Kit
2. HiFi Shield Plus
3. USB Audio Adapter

1. Test Set: ODROID C2 --> SOUND ADAPTOR --> SOUND ADAPTOR 3.5 JACK OUTPUT --> EXTERNAL CARD 3.5 JACK IN --> EXTERNEL CARD SPEAKER (NOISY for 3 three option above)
2. Test Set: ODROID C2 --> SOUND ADAPTOR --> SOUND ADAPTOR 3.5 JACK OUTPUT --> HEADPHONE (GOOD for 3 three option above)
3. Test Set: SAMSUNG GALAXY NOTE 4 3.5 JACK OUTPUT --> EXTERNAL CARD 3.5 JACK IN --> EXTERNEL CARD SPEAKER (GOOD)

When I listen output of this 3 option from headphone they do not have noise, but when I plug 3.5 to another card and then listen the output of that become noisy. When I try this option from my samsung galaxy note 4 phone it doesn't have noisy output. What might be the problem thank you.
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Re: C2 Audio Oupute Noise Problem

Unread postby odroid » Mon Apr 30, 2018 7:04 pm

Is there any specific reason why you don't try the latest Android 6.0.1 v4.0 image?
https://wiki.odroid.com/odroid-c2/os_im ... allow_v4.0
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Re: C2 Audio Oupute Noise Problem

Unread postby sbynkln » Mon Apr 30, 2018 7:10 pm

odroid wrote:Is there any specific reason why you don't try the latest Android 6.0.1 v4.0 image?
https://wiki.odroid.com/odroid-c2/os_im ... allow_v4.0
I had problem at Android 6 with "Assistive Touch" application because of override permissions. But I will try again.

Sent from my SM-N910C using Tapatalk
sbynkln
 
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Re: C2 Audio Oupute Noise Problem

Unread postby sbynkln » Mon Apr 30, 2018 10:13 pm

odroid wrote:Is there any specific reason why you don't try the latest Android 6.0.1 v4.0 image?
https://wiki.odroid.com/odroid-c2/os_im ... allow_v4.0
I have tried now wit Android 6.0.1 V4.0, same result. Problem is not about OS depended.

Sent from my SM-N910C using Tapatalk
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Re: C2 Audio Oupute Noise Problem

Unread postby odroid » Tue May 01, 2018 8:29 am

What do you mean "EXTERNAL CARD 3.5 JACK IN"?
Do you have a picture of your system?
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Re: C2 Audio Oupute Noise Problem

Unread postby sbynkln » Wed May 09, 2018 4:28 pm

@odroid, It is hand made sound card which converts audio to radio, so not big deal. I have solved problem by powering HiFi Shield Plus card from external power supply instead of odroid c2. So it seems problem based on voltage difference.
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