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  1. #11
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    Quote Originally Posted by Jeff07971 View Post
    If you read it it says Input to Output, Input to frame ground, output to frame ground are all 100M, so output to output is at least 100M

    As I said you have to know what you're looking at

    Jeff
    The outputs are not isolated from each other though as shown in the schematic. The outputs are isolated from the input and frame ground not each other.

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  2. #12
    Senior Member Jeff07971's Avatar
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    Quote Originally Posted by slartibartfast View Post
    The outputs are not isolated from each other though as shown in the schematic. The outputs are isolated from the input and frame ground not each other.

    Sent from my SM-G900F using Tapatalk
    Apologies I mistakenly downloaded RID-65 Datasheet

    Either way from the description of the problem this is a ground problem somewhere

    Jeff
    Players: SliMP3,Squeezebox3 x3,Receiver,SqueezePlayer,PiCorePlayer x3,Wandboard
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  3. #13
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    Quote Originally Posted by Jeff07971 View Post
    Apologies I mistakenly downloaded RID-65 Datasheet

    Either way from the description of the problem this is a ground problem somewhere

    Jeff
    Agreed. I wonder if it is caused by the the two outputs having common 0V.

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    Last edited by slartibartfast; 2017-06-25 at 03:10.

  4. #14
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    Quote Originally Posted by Howard Passman View Post
    Hi, Unfortunately my SB Radio died recently. It was my second most used SB and I really miss it for outdoor use. I have a few Raspberry pi's so I thought I'd try and make a replacement of sorts. I have a RSP3 with a HiFiBerry DAC+, a 7" touchscreen and a 2.5" hard drive. I would like to put the whole hing in a box with a couple of small speakers.

    I purchased this power supply for the 12v and 5v combo output. It has enough current on the 5 volt out to run everything with the pi and not get the under voltage issue. And of course it has enough output on the 12 volt supply to run the 18Watt amplifier. Here are links to Amazon and both products...

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    Now on to the issue. The 5 volt supply works great and if I run headphones off of the HiFiBerry DAC+, it's dead quiet. The 12 volt supply seems to work well on the amplifier and has no problematic noise unless I try to run both, the RSP3 and the amplifier at the same time. Then I get a high frequency squeal and some clicking noises. The noise does not increase in volume if I turn the volume up, but is loud enough at idle.

    If I run either one off of a separate supply, there is no discernible noise.

    Any help would be greatly appreciated.

    Howard
    Is it a DAC+ or an AMP+? The DAC+ runs from the 5V Pi power supply and the AMP+ runs the Pi from the AMP+ power supply. Two supplies are not required or permitted.

    https://www.hifiberry.com/build/docu...hifiberry-amp/

    Sorry ignore this. Didn't realise you were using a separate amp.

    Quote Originally Posted by Howard Passman View Post
    Hi, Unfortunately my SB Radio died recently. It was my second most used SB and I really miss it for outdoor use. I have a few Raspberry pi's so I thought I'd try and make a replacement of sorts. I have a RSP3 with a HiFiBerry DAC+, a 7" touchscreen and a 2.5" hard drive. I would like to put the whole hing in a box with a couple of small speakers.

    I purchased this power supply for the 12v and 5v combo output. It has enough current on the 5 volt out to run everything with the pi and not get the under voltage issue. And of course it has enough output on the 12 volt supply to run the 18Watt amplifier. Here are links to Amazon and both products...

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    Now on to the issue. The 5 volt supply works great and if I run headphones off of the HiFiBerry DAC+, it's dead quiet. The 12 volt supply seems to work well on the amplifier and has no problematic noise unless I try to run both, the RSP3 and the amplifier at the same time. Then I get a high frequency squeal and some clicking noises. The noise does not increase in volume if I turn the volume up, but is loud enough at idle.

    If I run either one off of a separate supply, there is no discernible noise.

    Any help would be greatly appreciated.

    Howard

    Sent from my SM-G900F using Tapatalk
    Last edited by slartibartfast; 2017-06-25 at 03:30.

  5. #15
    Senior Member Jeff07971's Avatar
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    Quote Originally Posted by slartibartfast View Post
    Agreed. I wonder if it is caused by the the two outputs having common 0V.

    Sent from my SM-G900F using Tapatalk
    He says
    Now on to the issue. The 5 volt supply works great and if I run headphones off of the HiFiBerry DAC+, it's dead quiet. The 12 volt supply seems to work well on the amplifier and has no problematic noise unless I try to run both, the RSP3 and the amplifier at the same time. Then I get a high frequency squeal and some clicking noises. The noise does not increase in volume if I turn the volume up, but is loud enough at idle.
    Its not clear here wether
    when I try to run both
    means audio signal (and signal ground) is connected between them or not

    What we need to know is that if both are run from the same PSU but NOT connected together in any way apart from the PSU 0v's are both still quiet.
    If they are its due to the audio signal and signal ground when connected together
    If they are not both quiet in the scenario the problem becomes more complex but possibly curable


    Jeff
    Players: SliMP3,Squeezebox3 x3,Receiver,SqueezePlayer,PiCorePlayer x3,Wandboard
    Server: LMS Version: 7.9.1 - 1503129892 on Centos 7 VM on ESXi 6.5.0U1 on Dell T320
    Plugins: AutoRescan/BBCiPlayer/PowerSave/PowerSwitchIII/Squeezecloud
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    Music: 383GB,1269 albums 17756 songs 4381 artists mostly FLACs

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  6. #16
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    Quote Originally Posted by Jeff07971 View Post
    He says

    Its not clear here wether means audio signal (and signal ground) is connected between them or not

    What we need to know is that if both are run from the same PSU but NOT connected together in any way apart from the PSU 0v's are both still quiet.
    If they are its due to the audio signal and signal ground when connected together
    If they are not both quiet in the scenario the problem becomes more complex but possibly curable


    Jeff
    High frequency squealing and clicking noises sounds like something is being shorted out and the psu is in current limit.
    Quote Originally Posted by Jeff07971 View Post
    He says

    Its not clear here wether means audio signal (and signal ground) is connected between them or not

    What we need to know is that if both are run from the same PSU but NOT connected together in any way apart from the PSU 0v's are both still quiet.
    If they are its due to the audio signal and signal ground when connected together
    If they are not both quiet in the scenario the problem becomes more complex but possibly curable


    Jeff

    Sent from my SM-G900F using Tapatalk

  7. #17
    Senior Member Jeff07971's Avatar
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    Quote Originally Posted by slartibartfast View Post
    High frequency squealing and clicking noises sounds like something is being shorted out and the psu is in current limit.



    Sent from my SM-G900F using Tapatalk
    I read that as noise from the speakers on the amp which sounds like digital noise (from "digital" impulse current changes) probably from the pi as the amp is likely to draw current in a slower changing way.

    But yes I agree if it is mechanical noise from the PSU
    Players: SliMP3,Squeezebox3 x3,Receiver,SqueezePlayer,PiCorePlayer x3,Wandboard
    Server: LMS Version: 7.9.1 - 1503129892 on Centos 7 VM on ESXi 6.5.0U1 on Dell T320
    Plugins: AutoRescan/BBCiPlayer/PowerSave/PowerSwitchIII/Squeezecloud
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    Music: 383GB,1269 albums 17756 songs 4381 artists mostly FLACs

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  8. #18
    Senior Member Jeff07971's Avatar
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    I re read the OP and you could be right

    At no point does he say its not mechanical noise !
    Players: SliMP3,Squeezebox3 x3,Receiver,SqueezePlayer,PiCorePlayer x3,Wandboard
    Server: LMS Version: 7.9.1 - 1503129892 on Centos 7 VM on ESXi 6.5.0U1 on Dell T320
    Plugins: AutoRescan/BBCiPlayer/PowerSave/PowerSwitchIII/Squeezecloud
    Remotes: iPeng8/Orangesqueeze/PC/Jivelite
    Music: 383GB,1269 albums 17756 songs 4381 artists mostly FLACs

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  9. #19
    Senior Member Apesbrain's Avatar
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    Had a similar problem and nothing helped until I found this add-on:
    https://www.amazon.com/Mpow-Ground-I...dp/B019393MV2/

  10. #20
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    Could be this problem.
    https://www.raspberrypi.org/forums/v...?f=28&t=149063


    Sent from my SM-G900F using Tapatalk

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