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Riscy
Guest
Wed Mar 10, 2010 8:59 pm
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?
PeterD
Guest
Wed Mar 10, 2010 8:59 pm
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
<riscy00_at_googlemail.com> wrote:
Quote:
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?
Why not silver?
John Larkin
Guest
Wed Mar 10, 2010 9:11 pm
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
<riscy00_at_googlemail.com> wrote:
Quote:
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?
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
Joerg
Guest
Wed Mar 10, 2010 10:57 pm
John Larkin wrote:
Quote:
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
riscy00_at_googlemail.com> wrote:
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?
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.
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.
John Larkin
Guest
Wed Mar 10, 2010 11:01 pm
On Wed, 10 Mar 2010 13:57:19 -0800, Joerg <invalid_at_invalid.invalid>
wrote:
Quote:
John Larkin wrote:
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
riscy00_at_googlemail.com> wrote:
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?
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.
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.
You had better.
John
Archimedes' Lever
Guest
Thu Mar 11, 2010 1:43 am
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy <riscy00_at_googlemail.com>
wrote:
Quote:
I'm seeking a supplier that supply gold plated metal spacer,
Don't you think you should determine the need first? The requirements
analysis for gold is generally not about current, but about keeping
oxidation OFF of connectors that are meant to be cycled numerous times
throughout their life.
Quote:
washer and screw which is to be used to pass 10Amp audio waveform signal
between two boards about 12mm aparts. The screw is M3.
Not needed. Also, relying on a screw to clamp up electrical connections
between two PCBs is the wrong approach. Two screws and a threaded thru
stand off will allow each screw to clamp up to each board individually.
That is far more reliable than trying to clamp the board together with a
screw and hoping that makes the contact good over a long term. Definitely
would not pass vibe tests.
Quote:
Has anyone done this kind of arrangement before, is gold plated
necessary for reliable contacts,
No. Not for this application.
Quote:
how do they performs over vibration?
Not the clamp method you describe. Even a small strap of copper and a
screw on EACH PCB would be better.
Quote:
The PCB size is 100mm diameter and supported by separate spacer
(nylon). The PCB has gold plated pads.
So what? Gold plated PCBs are becoming the norm in the RoHS realm.
That does not mean that gold is needed to connect to it/them. There or
anywhere else.
Quote:
Is brass sufficiently reliable for electrical contacts?
It depends on what metals it gets mated to. Tin plated copper is the
norm. Nickel Cadmium used to be it, but the environmentalists went
apeshit over that as well.
StickThatInYourPipeAndSmo
Guest
Thu Mar 11, 2010 1:48 am
On Wed, 10 Mar 2010 12:11:35 -0800, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
Quote:
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
riscy00_at_googlemail.com> wrote:
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?
Brass, preferably plated, is fine. Alodined aluminum would work well
too.
"Alodined"? Bwuahahahahahahaa! Talk about overkill!
There are plenty of standoffs in the market that are bare Aluminum and
they work fine in nearly all environs.
Quote:
The important thing is to make sure the screws stay tight.
No shit?
Quote:
The
PCB material will tend to cold-flow over time,
That depends on what the PCB is made from, Mr. Retarded Assumption Boy.
Quote:
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.
You are guessing as you go.... again... obviously.
Quote:
Use wavy or
belleville lockwashers, split rings if that's all you have.
Bullshit. Those are for mechanical, NOT electrical connections, you
stupid twit.
Quote:
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.
I'll bet that wasn't hard to do.
John Larkin
Guest
Thu Mar 11, 2010 2:30 am
On Wed, 10 Mar 2010 16:48:50 -0800, StickThatInYourPipeAndSmokeIt
<Zarathustra_at_thusspoke.org> wrote:
Quote:
On Wed, 10 Mar 2010 12:11:35 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
riscy00_at_googlemail.com> wrote:
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?
Brass, preferably plated, is fine. Alodined aluminum would work well
too.
"Alodined"? Bwuahahahahahahaa! Talk about overkill!
There are plenty of standoffs in the market that are bare Aluminum and
they work fine in nearly all environs.
The important thing is to make sure the screws stay tight.
No shit?
The
PCB material will tend to cold-flow over time,
That depends on what the PCB is made from, Mr. Retarded Assumption Boy.
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.
You are guessing as you go.... again... obviously.
Use wavy or
belleville lockwashers, split rings if that's all you have.
Bullshit. Those are for mechanical, NOT electrical connections, you
stupid twit.
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.
I'll bet that wasn't hard to do.
You are getting weirder and weirder. Every one of your posts is a rant
about how smart you are and how retarded everyone else is. You have
turned into a snarling, mangy junkyard dog.
You are very angry and very isolated. That can't be fun.
John
Jim Thompson
Guest
Thu Mar 11, 2010 3:11 am
On Wed, 10 Mar 2010 17:30:12 -0800, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
Quote:
On Wed, 10 Mar 2010 16:48:50 -0800, StickThatInYourPipeAndSmokeIt
Zarathustra_at_thusspoke.org> wrote:
On Wed, 10 Mar 2010 12:11:35 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
riscy00_at_googlemail.com> wrote:
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?
Brass, preferably plated, is fine. Alodined aluminum would work well
too.
"Alodined"? Bwuahahahahahahaa! Talk about overkill!
There are plenty of standoffs in the market that are bare Aluminum and
they work fine in nearly all environs.
The important thing is to make sure the screws stay tight.
No shit?
The
PCB material will tend to cold-flow over time,
That depends on what the PCB is made from, Mr. Retarded Assumption Boy.
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.
You are guessing as you go.... again... obviously.
Use wavy or
belleville lockwashers, split rings if that's all you have.
Bullshit. Those are for mechanical, NOT electrical connections, you
stupid twit.
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.
I'll bet that wasn't hard to do.
You are getting weirder and weirder. Every one of your posts is a rant
about how smart you are and how retarded everyone else is. You have
turned into a snarling, mangy junkyard dog.
You are very angry and very isolated. That can't be fun.
John
Maybe AlwaysWrong is right? Anyone who responds to AlwaysWrong's
posts all the time must certainly be retarded, don't you think?
...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at
http://www.analog-innovations.com | 1962 |
The only thing bipartisan in this country is hypocrisy
StickThatInYourPipeAndSmo
Guest
Thu Mar 11, 2010 4:21 am
On Wed, 10 Mar 2010 17:30:12 -0800, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
Quote:
You are getting weirder and weirder. Every one of your posts is a rant
about how smart you are and how retarded everyone else is. You have
turned into a snarling, mangy junkyard dog.
You are very angry and very isolated. That can't be fun.
John
You're a fucking retard that knows nothing about engines, yet acts here
as if you do, and when your CRAP "facts" were shot down, you cowered off
in the corner without ANY response.
You are not much different on electronics.
You are very stupid, and SHOULD be isolated, but there are plenty of
other retards here that will buddy up to your lame ass.
I am not one of them. I am always having fun, jackoff.
John Larkin
Guest
Thu Mar 11, 2010 4:50 am
On Wed, 10 Mar 2010 19:21:38 -0800, StickThatInYourPipeAndSmokeIt
<Zarathustra_at_thusspoke.org> wrote:
Quote:
On Wed, 10 Mar 2010 17:30:12 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
You are getting weirder and weirder. Every one of your posts is a rant
about how smart you are and how retarded everyone else is. You have
turned into a snarling, mangy junkyard dog.
You are very angry and very isolated. That can't be fun.
John
You're a fucking retard that knows nothing about engines, yet acts here
as if you do, and when your CRAP "facts" were shot down, you cowered off
in the corner without ANY response.
Response to what? To my claim that modern computer-controlled engines
usually have knock sensors? Are you saying they don't?
And this is a group about electronic design. So talk about electronic
design.
Quote:
You are not much different on electronics.
You are very stupid, and SHOULD be isolated, but there are plenty of
other retards here that will buddy up to your lame ass.
I am not one of them. I am always having fun, jackoff.
Obviously you aren't. You're never helpful and you're always angry,
obscene, and insulting. You never express joy, humor, curiosity, or
interest. You never ask questions because you're only here to insult
people.
You never discuss anything... in a discussion group.
What a way to live.
John
krw@att.bizzzzzzzzzzzz
Guest
Thu Mar 11, 2010 5:59 am
On Wed, 10 Mar 2010 19:11:14 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon_at_My-Web-Site.com> wrote:
Quote:
On Wed, 10 Mar 2010 17:30:12 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 10 Mar 2010 16:48:50 -0800, StickThatInYourPipeAndSmokeIt
Zarathustra_at_thusspoke.org> wrote:
On Wed, 10 Mar 2010 12:11:35 -0800, John Larkin
jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
On Wed, 10 Mar 2010 10:59:32 -0800 (PST), Riscy
riscy00_at_googlemail.com> wrote:
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?
Brass, preferably plated, is fine. Alodined aluminum would work well
too.
"Alodined"? Bwuahahahahahahaa! Talk about overkill!
There are plenty of standoffs in the market that are bare Aluminum and
they work fine in nearly all environs.
The important thing is to make sure the screws stay tight.
No shit?
The
PCB material will tend to cold-flow over time,
That depends on what the PCB is made from, Mr. Retarded Assumption Boy.
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.
You are guessing as you go.... again... obviously.
Use wavy or
belleville lockwashers, split rings if that's all you have.
Bullshit. Those are for mechanical, NOT electrical connections, you
stupid twit.
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.
I'll bet that wasn't hard to do.
You are getting weirder and weirder. Every one of your posts is a rant
about how smart you are and how retarded everyone else is. You have
turned into a snarling, mangy junkyard dog.
You are very angry and very isolated. That can't be fun.
John
Maybe AlwaysWrong is right? Anyone who responds to AlwaysWrong's
posts all the time must certainly be retarded, don't you think?
If responding to DimBulb is retarded, what is responding to responses to
DimBulb? ...just asking.
Robert Baer
Guest
Thu Mar 11, 2010 7:17 am
Riscy wrote:
Quote:
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?
Well, for a purist AudioPhool, the basic spacer, washer and screw
must be made of ultrapure Osmium, then plated with one mil Rhodium for
best adhesion, topped with 99.99 percent gold plate (balance of gold
alloy is copper to add strength and hardness).
StickThatInYourPipeAndSmo
Guest
Thu Mar 11, 2010 7:41 am
On Wed, 10 Mar 2010 19:50:50 -0800, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
Quote:
You're a fucking retard that knows nothing about engines, yet acts here
as if you do, and when your CRAP "facts" were shot down, you cowered off
in the corner without ANY response.
Response to what? To my claim that modern computer-controlled engines
usually have knock sensors?
That is not what you said, you retarded bastard. What you were jacking
off at the brain about was the effects of said controls. Quite
interesting tell, that you conveniently 'forgot' your err, and left it
out of your retarded LarkinTard response. Your mother should be jailed
for her crime.
Quote:
Are you saying they don't?
You're a goddamned idiot. I never said any such thing, nor did I ever
elude to such.
Quote:
And this is a group about electronic design.
Yeah. Not Johnny's attempt at understanding physics, while he
misinforms the rest of the world.
Quote:
So talk about electronic
design.
I will talk about what ever I wish, and your petty mouthings are as
meaningless as your grasp of internal combustion engines.
THIS GROUP will discuss whatever the fuck it wants whenever the fuck
the topic comes up, asswipe. Go police yourself, stupid twit.
StickThatInYourPipeAndSmo
Guest
Thu Mar 11, 2010 7:48 am
On Wed, 10 Mar 2010 19:50:50 -0800, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
Quote:
Obviously you aren't.
Fuck you, LarkinTard.
Quote:
You're never helpful and you're always angry,
So says the fuckhead that follows around my posts like a little lost
puppy.
Quote:
obscene, and insulting.
You are not permitted to define either term in a Usenet news group.
Quote:
You never express joy,
Sure I do, asswipe. It's just that asswipes like you go round spouting
that I do not.
Quote:
humor,
You are never looking, despite your pathetic little jabs.
Quote:
curiosity, or
interest.
I have zero interest in any of the bullshit that you spew, much less
the stupid crap about vapor phase degreasers. You are one of those dopey
fucktards that thinks because you had success with something, you are
using it correctly. The fact is, you NEVER read the fucking operational
manual for it, and neither did your pathetic tech(s).
Quote:
You never ask questions because you're only here to insult
people.
I do not ask questions because I do not need any answers. When I give
answers, however, I can count on Johnny Larkin the utter retard to chime
in with his usual totally retarded style.
Quote:
You never discuss anything... in a discussion group.
You are not looking well enough. There are several threads where I
made contributory comments this very weak. Even if that comment was
about how utterly stupid some other dipshit's post was. Too bad you
cannot understand that. Likely because you are one of said dopey
fucktards.
Quote:
What a way to live.
It is not for you to understand, much less judge, motherfucker. If
things in this society were for individuals to judge, you would already
be feeding worms.
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