[Amps] The Pin One Problem - Common Impedance Coupling

[Roger Parsons]

I wrote:
"I think that a technically 
correct generic name for the 'Pin 1 Problem' would be unwanted 'Common 
Impedance Coupling', and a bit of a search shows that this term has been quite frequently used."


Jim Brown wrote:

"No, it is NOT the correct description."
Jim Brown presented a paper to the AES Convention in October 2003 entitled:
"Testing for Radio-Frequency CommonImpedance Coupling (the "Pin 1 Problem") inMicrophones and Other Audio Equipment."


I guess that must have been some other Jim Brown. 


Of course, not every case of unwanted common impedance coupling is a 'Pin 1' problem, but every 'Pin 1' problem is a case of unwanted common impedance coupling. A search will show that Jim is far from alone in the audio world in equating the two.


73 Roger
VE3ZI