Re: [Amps] A Meeting Ground

[Will Matney <craxd1@ezwv.com>]

Dennis,

Well they probably would somewhat but I would think the currents in the 
face plate would be reduced a good degree this way. If the negative from 
the power supply is attached directly to the chassis pan like most are, 
the the electrons will flow towards the capacitor, It the wiper lead is 
attached to the pan, and the current passed it first, they should tend 
to follow it more. The reason being is there's two mechanical 
connections between the chassis and the cap through the faceplate. This 
being the connection from the face plate to the chassis pan and the caps 
threaded shaft to the faceplate. There is actually another, after the 
threaded portion, it has to move through the bearing into the rotor 
plates. On the other hand, there is only one mechanical connection from 
the chassis to the spider, and one at the wiper to the rotor plates. 
Also, each mechanical connection will contribute some impedance 
according to what type it is. I used a soldered connection from the 
wiper to the chassis. Most mechanical connections where the faceplate 
attached to the chassis are joined by screws, rivets, etc. or may be 
spot-welded which would be better in a way. I would think a mechanical 
joint being soldered or welded would provide the less amount of impedance.

This is one subject I have not seen many studies on, only discussion 
like we are having. I wonder if any university studies have been 
performed on the way current flows through chassis grounds and intermix? 
I have watched distortions and lines of heating in steel from a high 
currents passed through it while welding or heating, The hottest portion 
was always a straight path between the electrode and ground. Using a DC 
current, I imagine an iron powder could be used on the surface to show 
the lines of flux as on a magnet, I'm not sure on this. I do know in 
welding, this direction means a good deal because of arc-blow. Anytime 
an arc is ran towards the direction of the ground, the arc will want to 
wander from side to side, and back and forward. When this direction is 
reversed so the arc is moving away from the ground, the arc straightens out.

Best & 73's

Will Matney


Dennis12Amplify@aol.com wrote:

> In a message dated 11/4/04 9:09:52 PM Central Standard Time,  craxd1@ezwv.com 
> writes:
>
> Since  currents take the closest path to ground, it should go 
> through this wiper  lead to the pan instead of the threaded shaft through 
> the face  plate.
>
>
>
> Will,
>
> Actually, since both paths would have some amount of impedance to them, the  
> currents would be split and take both paths, and probably not  equally.
>
> Regards,
>
> Dennis O.
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