| 摘要 |
PROBLEM TO BE SOLVED: To provide an audio output signal directly from a power supply, and to activate an isolated gate which pulse-width-modulates an input audio signal and uses the pulse-width modulation, to utilizes an output transformer having applied high voltage and low current, which switches high-voltage/low-current pulse modulation voltage to low-voltage/high-current signal of the transformer output, at such times, the output signal must be detected accurately by a switching circuit and must be demodulated to provide the audio output signal by activating a speaker. SOLUTION: A novel circuit that generates direct audio from a power supply that uses no power amplifier and that can provide full isolation to any impedance load. It has no power amplifier output stage and has a zero signal-to-noise ratio, when there is no signal input because the circuit is designed with MOSFETs that do not conduct unless there is a signal input. COPYRIGHT: (C)2006,JPO&NCIPI
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