ماژول
آمپلی فایر PAM8403 یک برد دیجیتال مینیاتوری فوق العاده کوچک با کلاس کاری D است که می تواند بطور عالی نویز را حذف کند. حتی زمانی که هیچ وسیله ای به ورودی صدا آن وصل نیست، هیچ گونه نویزی از نزدیکی اسپیکر متصل به آن شنیده نمی شود. این ماژول دارای دو کانال خروجی استریو 3 وات بصورت مجزا می باشد که از ولتاژ 5 ولت تغذیه می کند و می تواند مستقیما بک اسپیکر کوچک 4 اهم و یا 8 اهم را با تمام توان کیفیت مناسب صدا راه اندازی کند.
داشتن فیلتر یگانه Null-LC از کلاس D بر روی برد و همچنین امکان اتصال مستقیم ماژول به USB کامپیوتر جهت تغدیه از امکانات این ماژول است. تقویت کنندگی فوق العاده قوی و طراحی مینیاتوری که باعث می شود که از آن بتوان بطور اینترنال در پروژه ها و محصولات مختلف دیجیتالی استفاده کرد. از این ماژول می توانید به همراه برد آردوینو در پروژه های خود استفاده کنید.
Description:
This is a 2-channel 3 W audio amplifier board based on the PAM8403 chip which is a very efficient 3 W filter-free class D audio amplifier.
The PAM8403 is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filterless the architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus to save the and PCB area.
With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB. It can extend the battery life, ideal for portable applications. The PAM8403 is available in the SOP-16 package. It can simply omit the noise even when there is no input load connected to the device.
It also can be connected to a computer USB port for power supply. This module is greatly compatible with Arduino boards.
1. When the PAM8403 works with LC filters, it should be connected with the speaker before it's
powered on, otherwise, it will be damaged.
2. When the PAM8403 works without LC filters, it's better to add a ferrite chip bead at the outgoing line of the speaker for suppressing the possible electromagnetic interference.
3. When the PAM8403 is powered with 4 battery cells, it should be noted that the voltage of 4 new dry or alkaline batteries is over 6.0V, higher than its operation voltage, which will probably damage the device. Therefore, it's recommended to use either 4 Ni-MH (Nickel Metal Hydride) rechargeable batteries or 3 dry or alkaline batteries.
4. One should not make the input signal too large. The large signal can cause the clipping of the output signal when increasing the volume. This will damage the device because of big gain of the PAM8403.
5. When testing the PAM8403 without LC filters by using a resistor instead of a speaker as the output
load, the test results, e.g. THD or efficiency, will be worse than those of using the speaker as load.
Application:
Making a portable speaker for mobile phones, notebooks
Design and implementation of speaker menus
Design and implementation of audio systems
Design and implementation of speaker board systems for elevators
Features:
1. Operating voltage: 2.5V-5.5V. Note: The power supply voltage should not exceed 5.5V, the power supply should not be reversed.
2. Speaker with: 4-8 Europe, recommended: 4 Europe; Speaker power: 2-8W.
3. Can use the computer USB port 5V power supply, or use the phone charger 5V, 5V power supply, you can also use the lithium battery power.
4. High efficiency 90%, 4Ω load, and 5V power supply conditions, can provide 3W (left channel) +3 W (right channel) output power. Class A, B, and other power amplifier efficiency is only about 30%, D class amplifier in today's green trend under the highly respected.
5. D class amplifier power is extremely high, not because of temperature impact sound quality, and do not add heat sink, take a small volume.
6. Power amplifier board built-in de-noising circuit, power is turned on / off without puff noise; module with short-circuit overcurrent protection and over-temperature protection.
7. Board size: 21 × 19 (mm)