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Industry: Email Alert RSS FeedCheck the bias current (or how to ensure that a blessing is heard).(Rarely Asked Questions: Strange but true stories from the call logs of Analog Devices)(Advertisement)
EDN, November, 2005 by Bryant, James
Q. The bias current in modern amplifiers is very small. Do I need to bother about it?
A. At Mass in Limerick, Ireland (the location of one of Analog Devices' manufacturing facilities) one Sunday, the priest was rather softly spoken. Almost whispering into the microphone he said, "The Lord be with you." Nothing at all came out of the PA system and only the front row could possibly have heard him. Picking up the microphone he murmured to himself, "There's something wrong with the microphone." This was amplified to fill the church and the congregation responded to a man, "And also with you!" I restrained my mirth with difficulty and afterwards offered to fix the problem.
It was a moving coil microphone with a differential output to an SSM2019...
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