Attenuation amplitude adjustable low frequency power amplifier
A technology of a power amplifier and a low-noise amplifier, applied in the field of low-frequency power amplifiers, can solve problems such as the large influence of power-frequency interference of power amplifiers, and achieve the effects of high practicability, filtering out the interference of power-frequency noise, and simple circuit structure
Inactive Publication Date: 2018-03-16
成都西井科技有限公司
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is that the power frequency interference of the power amplifier in the prior art has a great influence, and the purpose is to provide a low-frequency power amplifier with adjustable attenuation amplitude, which can effectively filter out the interference of power frequency noise
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[0017] Such as Figure 1 to Figure 3 As shown, the low-frequency power amplifier with adjustable attenuation range includes low-noise amplifier, band-stop filter, signal amplifier, power amplifier, peak detector, analog-to-digital converter, single-chip microcomputer, LCD display, regulated power supply, load, and the A low noise amplifier, a band-stop filter, a signal amplifier, a power amplifier, a peak detector, an analog-to-digital converter, a single-chip microcomputer, and an LCD display are connected in sequence, the low noise amplifier receives an input signal, the load is connected to the power amplifier, and the The stabilized power supply supplies power for low-noise amplifiers, band-stop filters, signal amplifiers, power amplifiers, peak detectors, analog-to-digital converters, single-chip microcomputers, and LCD displays; the band-stop filters include capacitors C1, capacitors C2, capacitors C3, Resistor R1, resistor R2, resistor R3, potentiometer R4, resistor R5,...
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The invention discloses an attenuation amplitude adjustable low frequency power amplifier, comprising a low noise amplifier, a bandstop filter, a signal amplifier, a power amplifier, a peak detector,an analog to digital converter, a microcontroller, an LCD display, a voltage stabilized power supply and a load. The low noise amplifier, the bandstop filter, the signal amplifier, the power amplifier, the peak detector, the analog to digital converter, the microcontroller and the LCD display are connected in sequence. The low noise amplifier receives an input signal. The load is connected with the power amplifier. The voltage stabilized power supply supplies power to the low noise amplifier, the bandstop filter, the signal amplifier, the power amplifier, the peak detector, the analog to digital converter, the microcontroller and the LCD display. The attenuation amplitude adjustable low frequency power amplifier is simple in circuit structure and chip in device price. According to the attenuation amplitude adjustable low frequency power amplifier, a low frequency signal can be amplified well; relatively high indexes and relatively high practicability can be achieved in aspects such asan output bandwidth, power and efficiency; and the interference of power frequency noise can be effectively filtered.
Description
technical field [0001] The invention relates to a power amplifier, in particular to a low-frequency power amplifier with adjustable attenuation range. Background technique [0002] Power amplifier (English name: power amplifier), referred to as "power amplifier", refers to an amplifier that can generate maximum power output to drive a certain load (such as a speaker) under a given distortion rate. The power amplifier plays a pivotal role in the "organization and coordination" of the entire audio system, and to some extent determines whether the entire system can provide good sound quality output. The main working principle is to use the current control function of the triode or the voltage control function of the field effect tube to convert the power of the power supply into a current that changes according to the input signal. Because the sound is a wave of different amplitude and frequency, that is, the AC signal current, the collector current of the triode is always β t...
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IPC IPC(8): H03F1/26H03F3/187H03F3/213
CPCH03F1/26H03F3/187H03F3/213H03F2200/294
Inventor 李正军
Owner 成都西井科技有限公司