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Old 16th November 2004, 06:09 AM   #1
Bikeman is offline Bikeman  Australia
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Default Ground question

Hi everyone,

This may seem like a silly question, but I'll ask anyway.

If I have a basic power supply board like the attached pic (please forgive the lack of artistry), with the star ground for amp boards, speaker -ve, etc at one end. Would it be best to put the 0v leads from the transformer to the star ground, or the other end of the board?
Will it make a difference?

Thanks,

Mark
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Old 16th November 2004, 07:46 AM   #2
Bikeman is offline Bikeman  Australia
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This is standard single sided pcb, not solid metal busbar. Any recomendations?

Mark
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Old 16th November 2004, 12:46 PM   #3
Ropie is offline Ropie  United Kingdom
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Just put the earth in the star ground, though it shouldn't make any difference where it goes.

Is this for a GC? If so, your speaker ground connection should go to a separate ground point (the signal ground) which is then connected by a thin guage wire to the main power star ground. This way you minimise any 'backwash' into the signal path. Your pot/stepped attenuator should also be grounded in the signal star ground.

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Old 16th November 2004, 02:03 PM   #4
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Default Re: Ground question

Quote:
Originally posted by Bikeman
Would it be best to put the 0v leads from the transformer to the star ground, or the other end of the board?

Put it in the rectifier side of the board,that way the capacitors charging spikes from the rectification , don't pass and don't polluted the star ground.

Cheers
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Old 17th November 2004, 11:23 AM   #5
Bikeman is offline Bikeman  Australia
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No, not a gainclone. It's for an esp p3a.

I thought it might not be a good idea to put the transformer leads straight to the star ground.
Apparently I'm not alone, so I'll go with the other end.

Thanks guys.

Mark.
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