DIY Audio Projects Forum

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.

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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Some of my DIY Tube Amplifier Projects:

• PoddWatt: 5751 / EL84 Push-Pull DIY Tube Amplifier Project
• OddBlocks: KT88 Push-Pull DIY Tube Amplifiers (Mono Blocks)
• ForeWatt: ECC802S (12AU7 / ECC82) DIY Tube Preamplifier Project
• GrooveWatt: Tube (Valve) RIAA Phono Preamplifier Project

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.