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Old 14th November 2007, 09:19 AM   #1
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Default mounting RCA and speaker terminals on chassis

These forums have been great for learning a lot about the topic of DIY audio, thanks everyone! This is my first post however, as I have not been able to find out about this simple question:

We are currently building a little chipamp from BrianGT. When mounting the RCA jacks and speaker terminals, do we have to make sure that they aren't actually touching the chassis somewhere? Or is it ok to have the signal ground touching the metal chassis? If they do have to be mounted without touching, what is the best way to do so? We are working with drilled aluminium panels here.

I know this may seem like quite a simple question, but I am quite new to this and I actually haven't been able to find out.

Thanks in advance.
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Old 14th November 2007, 10:16 AM   #2
Nordic is offline Nordic  South Africa
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Signal grounds should be isolated from chassis or you'll get lots of hum.
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Old 14th November 2007, 10:37 AM   #3
Vikash is offline Vikash  United Kingdom
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Welcome jaimango.

The jacks will come with two insulating washers (coloured plastic) which go either side of the panel and prevent the jacks touching the panel. The drilled holes should therfore be sufficiently sized.
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Old 19th February 2008, 09:11 PM   #4
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Thanks for all of your help, I'm happy to say no hums here.

In the end, the connectors I purchased didn't have any insulating washers; however I bought a multi-pack of plastic washers on ebay, and fit them to the back panel.

The threads on the connectors wouldn't fit (as the panel was 3mm Alu) but since it was so soft I just routed some washer sized holes through 1-2 mm and now it all fits together nicely.
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Old 19th February 2008, 09:17 PM   #5
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For power amps I've successfully mounted the RCAs in the chassis, reasonably close together, with the chassis ground point right between them. The output connectors should never ground to the chassis. It won't work with phono preamps, but it might be possible with line stages. Not preferable, but possible.
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Old 20th February 2008, 09:55 AM   #6
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by Conrad Hoffman
mounted the RCAs in the chassis, reasonably close together, with the chassis ground point right between them.
that seems like a practical work around.
Presumably the aluminium (not steel) needs to be clean and corrosion free.
Is the Safety Earth elsewhere?
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Old 20th February 2008, 11:47 AM   #7
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Quote:
Originally posted by Vikash
Welcome jaimango.

The jacks will come with two insulating washers (coloured plastic)
Where can I buy just the washers?
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Old 20th February 2008, 11:54 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
the two washers need at least one with a step to prevent the RCA coming into contact with the chassis.
The washers need to suit the physical dimensions of the RCA socket thread and length. The hole in the chassis needs to match the washer step and not the thread diameter.
You might be able to use plain washers and an insulating sleeve, but this would be a once only fiddle that may perform just as well.
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Old 20th February 2008, 02:22 PM   #9
jb74 is offline jb74  United States
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Default plastic washers

http://mouser.com/

search for part # 561-SW25 (plastic shoulder washers I have used)

The online catalog page where that part is found will show
other washers as well
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Old 21st February 2008, 11:05 PM   #10
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Default Re: plastic washers

Quote:
Originally posted by jb74
http://mouser.com/

search for part # 561-SW25 (plastic shoulder washers I have used)

The online catalog page where that part is found will show
other washers as well
Thanks
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