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Chào các bạn! 
Trong bài viết này, mình sẽ hướng dẫn các bạn thiết kế 1 mạch phát âm thanh đơn giản sử 
dụng: mic, loa và IC LM386. 
I. IC LM386 
LM386 là IC khuếch đại điện áp thấp, sử dụng trong các mạch khuếch đại âm thanh, các 
thông số chính: 
- Giải điện áp hoạt động rộng: 4V-12V hoặc 5V-18V. 
- Độ tăng ích điện áp từ 20-200 (có thể thay đổi bằng cách mắc thêm trở hoặc tụ vào 2 
chân 1, 8, phần này các bạn tham khảo thêm ở Typical applications trong datasheet của 
LM386). 
- Tối thiếu hóa các mạch hỗ trợ bên ngoài. 
Sơ đồ chân: 
II. SƠ ĐỒ NGUYÊN LÝ 
Mình sử dụng MIC để thu âm thanh, sau khi qua LM386 âm thanh sẽ được phát ra bằng loa 
8W. 
(Các bạn có thể vào đây để xem hình ảnh của mic: 
Đăng ký hoặc đăng nhập để thấy Link - Ủng hộ bài viết bằng nút " Thích" 
) 
Dưới đây là sơ đồ nguyên lý của mạch:
Mạch Test: 
Video Test: 
Click to expand... 
Đây chỉ là mạch phần cứng đơn giản để phát âm thanh, các bạn có thể mở rộng những ứng 
dụng rất hay như thêm vi điều khiển, các IC có tính năng ghi âm để lưu lại âm thanh rồi mới 
cho phát ra loa. 
Các bạn tải sơ đồ nguyên lý ở cuối bài nhé! 
Chúc các bạn thành công!

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mạch âm thanh đơn giản với micro nhỏ

  • 1. Chào các bạn! Trong bài viết này, mình sẽ hướng dẫn các bạn thiết kế 1 mạch phát âm thanh đơn giản sử dụng: mic, loa và IC LM386. I. IC LM386 LM386 là IC khuếch đại điện áp thấp, sử dụng trong các mạch khuếch đại âm thanh, các thông số chính: - Giải điện áp hoạt động rộng: 4V-12V hoặc 5V-18V. - Độ tăng ích điện áp từ 20-200 (có thể thay đổi bằng cách mắc thêm trở hoặc tụ vào 2 chân 1, 8, phần này các bạn tham khảo thêm ở Typical applications trong datasheet của LM386). - Tối thiếu hóa các mạch hỗ trợ bên ngoài. Sơ đồ chân: II. SƠ ĐỒ NGUYÊN LÝ Mình sử dụng MIC để thu âm thanh, sau khi qua LM386 âm thanh sẽ được phát ra bằng loa 8W. (Các bạn có thể vào đây để xem hình ảnh của mic: Đăng ký hoặc đăng nhập để thấy Link - Ủng hộ bài viết bằng nút " Thích" ) Dưới đây là sơ đồ nguyên lý của mạch:
  • 2. Mạch Test: Video Test: Click to expand... Đây chỉ là mạch phần cứng đơn giản để phát âm thanh, các bạn có thể mở rộng những ứng dụng rất hay như thêm vi điều khiển, các IC có tính năng ghi âm để lưu lại âm thanh rồi mới cho phát ra loa. Các bạn tải sơ đồ nguyên lý ở cuối bài nhé! Chúc các bạn thành công!