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Old 12th July 2011, 02:43 AM   #1
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Default Isolating RCA input/terminals from enclosure

I'm in the final stages of a stereo LM1875 build and my enclosure (extruded aluminum) arrived today. After drilling the back plate and attaching the speaker terminals and RCA inputs, I realized the plate was metal so I now have the issue of my speaker signal grounding to the RCA input ground. This will obviously connect to the chassis ground as well. Short of making a new back plate out of Acrylic, any ideas on isolating the terminals and RCA input?
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Old 12th July 2011, 02:57 AM   #2
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If the RCAs didn't come with insulating shoulder washers, you can drill the panel holes large enough that there's no metal to metal contact, and mount them on a small piece of PC board that mounts inside the panel.

Mike
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Old 12th July 2011, 04:21 AM   #3
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I usually build power amps with the RCAs screwed right into the panel, and the chassis signal ground point to a screw halfway between them. The speaker jacks must be isolated, but any normal bananas would be.

For preamps the RCAs must be floated and wired to ground. At least that's what I've found necessary for best performance.
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Old 12th July 2011, 11:18 AM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Conrad Hoffman View Post
I usually build power amps with the RCAs screwed right into the panel, and the chassis signal ground point to a screw halfway between them.
I suspect that this will give very good results.
It's about time I tried it!
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Old 12th July 2011, 04:23 PM   #5
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I'll give it a go. Thx
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Old 12th July 2011, 07:06 PM   #6
gychang is offline gychang  United States
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for this newbie, I prefer wood enclosure for this reason.
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