February 2016
Intermediate to advanced
216 pages
14h 38m
English
Content preview from Newnes Audio and Hi-Fi Engineer's Pocket Book, 3rd Edition
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286
P.a.
system problems
Instability This is caused by unwanted coupling between
two points between which there is amplification. There are
three types, capacitive, magnetic, and common impedance. At
audio frequencies capacitive coupling is rarely a problem, but
magnetic coupling between speaker feeders and microphone
cables are possible. A high-pitched whistle is the usual
symptom, but it can be supersonic and although not audible,
result in amplifier overloading and distortion. It can be
identified by a steady reading on the output meters with no
signal, and is avoided by keeping speaker and microphone
cables well apart, especially over lon ...
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