| 摘要 |
PURPOSE: An audio amplifier for a vehicle/flying object loading is provided to amplify by a high output and to improve sound efficiency. CONSTITUTION: A pre-amplifier(61) amplifies an audio signal. A low frequency energy detector(62) is connected to the pre-amplifier(61) and detects a low frequency energy included in the amplified audio signal from the pre-amplifier(61). A transformer(63) is connected to the pre-amplifier(61) and amplifies an output signal of the low frequency energy detector(62) according to a winding rate. A collector of a transistor(64) is connected to one terminal of the transformer(63). A base of the transistor(64) is connected to the low frequency energy detector(62). An emitter of the transistor(64) is connected to a ground.
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