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 Post subject: grounding question
PostPosted: 07 Nov 2020, 20:11 
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Joined: 21 Oct 2020, 14:38
Posts: 10
I'm building a small chipamp using a TDA7293 board with a smps power supply and connecting 3 inputs via a selector switch that switches both the hot and the ground from each source.

Currently the amp board's only 'ground' connection is to the smps power supply.

For grounding do I connect the speaker ground to the star ground?

Do I connect all of the grounds on the rca inputs to the star ground or leave them unconnected since the switch also switches them. If I don't connect them at the inputs do I connect the grounds at the volume control to the star ground?

Thanks.


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 Post subject: Re: grounding question
PostPosted: 08 Nov 2020, 21:05 
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Joined: 04 Jun 2008, 20:59
Posts: 4308
Location: Arizona, USA
Hi, See my thoughts in italics.

I'm building a small chipamp using a TDA7293 board with a smps power supply and connecting 3 inputs via a selector switch that switches both the hot and the ground from each source.

Currently the amp board's only 'ground' connection is to the smps power supply.

For grounding do I connect the speaker ground to the star ground? Yes I would do that

Do I connect all of the grounds on the rca inputs to the star ground or leave them unconnected since the switch also switches them. If I don't connect them at the inputs do I connect the grounds at the volume control to the star ground? I would attach the side of the switch that is going to the amp to the star and leave the input sides floating. If you did both sides it could form a ground loop and introduce hum and noise.

Good listening
Bruce

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 Post subject: Re: grounding question
PostPosted: 08 Nov 2020, 22:42 
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Joined: 21 Oct 2020, 14:38
Posts: 10
thank you.

This is the first amp I've built that will be sent to someone else to use so I want to make sure it is right.


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