Karl Ruling

An Inexpensive Monitor Microphone


An inexpensive electret microphone element can make a good substitute for the higher-quality dynamic microphone usually used as the pickup mic in a stage monitor system. The electret’s sensitivity is excellent, and its noise level low enough that the expensive dynamic mic can be freed for use elsewhere. Furthermore, if you don’t have your monitor mic caged against theft, use of an electret like the one described below reduces the probability that a thief will decide to take it.



Figure 1 shows the microphone circuit we used at Michigan Tech. Bill Isaacson put ...

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