功放电路PCB布线注意问题（Power amplifier circuit PCB wire attention problem）.docVIP

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功放电路PCB布线注意问题（Power amplifier circuit PCB wire attention problem）.doc

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功放电路PCB布线注意问题（Power amplifier circuit PCB wire attention problem）

功放电路PCB布线注意问题（Power amplifier circuit PCB wire attention problem） Power amplifier circuit PCB wire attention problem Is a computer sound card, walkman, MP3, this kind of sound source loading ability, decrease the active speaker input impedance is not easy to see the effects on the sound quality is very weak, the author tried to active speakers when testing input impedance at 2 k Ω, not feeling tone change, work for a long time to also did not see abnormalities. Enhance the ability of high frequency anti-interference For stray majority is in the high frequency electromagnetic wave signal, the characteristics of the amplifier input to add disk capacitor, capacitance value can be selected between 47-220 p, hundreds of skin method should the value of capacitance frequency turning point two or three orders of magnitude higher than the frequency range and the effective listening to audio segment of the acoustic pressure response and feeling the effects of negligible. 3. Pay attention to the installation of power transformer The distance between the transformer and the PCB can be drawn as far as possible from the better power transformer, and the position between the transformer and the PCB is adjusted, and the transformer is far from the amplifier. The power transformer of EI type power transformer is different in different directions, and it is important to avoid interference with the strongest Y-axis in the direction of the PCB. 4. The metal enclosure shall be grounded In the case of HIFI independent amplifier, the product of design specification has an independent location on the chassis, which actually reduces the external interference with the use of the electromagnetic shielding of the chassis. For common active speakers, the metal panel that doubles as a radiator also needs grounding. The volume, the tonal potentiometer case, the condition permitting, to be grounded as far as possible, the practice proves that this measure is very effective for the PCB working in