. Electronic apparatus for biological research . Figure resistance of a loudspeaker is commonly as low as 3 Q. An appropriate valve might have r„ = 5,000 The two can be matched for approximate maxi- mum power transfer by using a transformer of turns ratio (5,000/3)^/^ {Figure ). * An unfortunate but accepted piece of jargon. Is nothing to do with excessive values of load. 'Overloading' simply means an excessive input that takes the working point out- side the working region. 141

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