Gold Plated M3 Screw and spacer

 

I'm seeking a supplier that supply gold plated metal spacer, washer
and screw which is to be used to pass 10Amp audio waveform signal
between two boards about 12mm aparts. The screw is M3.

Has anyone done this kind of arrangement before, is gold plated
necessary for reliable contacts, how do they performs over vibration?
The PCB size is 100mm diameter and supported by separate spacer
(nylon). The PCB has gold plated pads.

Is brass sufficiently reliable for electrical contacts?

 

On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy


Why not silver?

 

On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy


Brass, preferably plated, is fine. Alodined aluminum would work well
too. The important thing is to make sure the screws stay tight. The
PCB material will tend to cold-flow over time, making the screws
loose, and then the connection can heat up because of the 10 amps,
which enhances the cold flow, and you have runaway. Use wavy or
belleville lockwashers, split rings if that's all you have.

The current is kind of low for this to happen, but I've seen serious
waveform distortion from running high currents through steel
spacers... at currents like 100 amps RMS. Thought they were brass, but
they turned out to be plated steel. That sure confused me for a while.

John

 

John Larkin wrote:

I've used nickel-plated everything in the past. Washers, screws, nuts,
even the circuit board. Is that still environmentally legit in CA these
days?

Yesterday I came within 100ft of your building driving down Van Ness,
the steering wheel desperately wanted to pull into Otis Street by itself
but I was in a serious rush to get to I80, where of course there was a
truck accident ... :-(

Next time I'll stop by, promise.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

wrote:


You had better.

John