| 41. | The boy, a tinkerer, helped his dad repair projectors and build audio amplifiers for the movies, newly with sound.
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| 42. | An output transformer in an audio amplifier or radio receiver sends only the AC to the loudspeaker, for example.
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| 43. | The speakers are driven by a series of audio amplifiers that are usually powered by a portable diesel generator.
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| 44. | The electronic design was revised, and the audio amplifier was rather more complex, incorporating rotary bass and treble controls.
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| 45. | A low-pass filter in the audio amplifier filters the quench and RF frequencies from the output, leaving the AM modulation.
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| 46. | The data sheets of all these audio amplifiers should have sample schematics of simple circuits that you can start from.
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| 47. | It has two radio frequency amplifier stages, one grid-leak detector / amplifier and three class A audio amplifier stages.
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| 48. | :An audio amplifier, presumably.
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| 49. | One early application of PWM was in the Sinclair X10, a 10 W audio amplifier available in kit form in the 1960s.
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| 50. | The preceding stages in such a chain are low power audio amplifiers which perform tasks like adding electronic effects such as reverb.
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