| 11. | You have to point the Audio frequency directly at the Harmonizer, to boost its output power.
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| 12. | If the air waves are at an audio frequency, the brain then experiences " sound ".
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| 13. | Duddell's circuit was limited to audio frequencies.
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| 14. | Transformers for use at power or audio frequencies typically have cores made of high permeability silicon steel.
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| 15. | The Second Doctor used an audio frequency to jam them, causing them to spin, crash and disintegrate.
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| 16. | Its impedance at audio frequencies, and especially at the more restricted telephone band frequencies, is far from constant.
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| 17. | However, lumped component devices are also possible at lower frequencies, such as the audio frequencies encountered in telephony.
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| 18. | Audio and video verification techniques use microphones and cameras to record audio frequencies, video signals, or image snapshots.
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| 19. | In other words, when observing the audio frequencies only, the record appeared to have an ordinary stereo recording.
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| 20. | Different audio frequencies represent different letters; for example, 18kHz represents " A ", and 19.125kHz represents " P ".
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