[TenTec] Omni VI audio problem

[Paul Christensen]

Here's a thorough explanation of the audio connector bonding problem from K9YC:

http://www.audiosystemsgroup.com/Pin_1_Revisited.pdf

The problem is ripe when circuit board sub-assemblies are used as a direct interface to the outside world.  It's especially problematic when using an extruded aluminum chassis.  Typically, a circuit board with audio connectors slides into the retaining fins of the chassis.  But, there's no cost-effective nor practical means to bond the connector to the chassis end-plates with a bonding jumper after assembly.  Many manufacturers ignore the potential for hum/buzz, and settle for convenience and cost-effective assembly over noise performance as discussed in K9YC's article.  

Paul, W9AC