LM339 IC คืออะไร / ทำหน้าที่อะไร / ทำโปรเจกต์อะไรได้บ้าง (สรุปใช้งานเข้าใจง่าย) ⸻ 🔧 LM339 คืออะไร LM339 คือ IC Comparator แบบ 4 ช่อง (Quad Comparator) ภายในมีตัวเปรียบเทียบแรงดันไฟฟ้า ทั้งหมด 4 ตัวในชิปเดียว ใช้แรงดันไฟเลี้ยงเดี่ยวหรือสองแหล่งได้ (Single / Dual Supply) ⸻ ✅ หน้าที่หลักของ LM339 👉 เปรียบเทียบแรงดันไฟฟ้า 2 จุด • ถ้าแรงดัน ขา ( ) มากกว่าขา (–) → Output จะถูก ดึงต่ำ (LOW) • ถ้าแรงดัน ขา ( ) น้อยกว่า (–) → Output จะ ลอย (ต้องมี Pull-up) 📌 Output เป็นแบบ Open-Collector • ต้องใช้ R P
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