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Stupid? Grounding Question
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numbernone



Joined: Aug 16, 2006
Posts: 477
Location: new york city

PostPosted: Fri Oct 20, 2006 7:31 am    Post subject: Stupid? Grounding Question Reply with quote  Mark this post and the followings unread

As I come nearer to finishing my first group of modules and begin planning the cabinet, I start to wonder...do all modules share a common ground, or each only with its own individual ground? (does this make sense?)
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kkissinger



Joined: Mar 28, 2006
Posts: 1212
Location: Kansas City, Mo USA
Audio files: 29

PostPosted: Fri Oct 20, 2006 10:52 am    Post subject: Reply with quote  Mark this post and the followings unread

I think either way would work.

On my Aries synth, the power is supplied to the modules via back plane connectors. Thus, the power supply and grounds are supplied from common busses. Each module, in turn, has a pair of small capacitors across from -15 to ground and +15 to ground.

I have suspected that my bus lines may not be thick enough. I've never observed my bus (power supply) lines heating up however they may be imparting some resistance that could impact the synth's performance.

Next time I have the synth off the rack for service I plan to put thicker power supply lines in.

The ideal grounding situation is where the electrical path from each component terminates at a common ground point AND the resistance from each component to the ground point is equal (and as close to zero as possible). The thing to avoid is multiple paths from a component to a ground point (the infamous ground loop scenario).

One of the problems in my (and others') studios is the difficulty to terminate grounds at a single point with racks of equipment that span from one wall to another.

Every now and then, my trusty Ebtech hum-eliminator comes in handy Smile
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