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ZK-ST21 Bluetooth Amp Circuit Board

🔊 【 ZK-ST21 Bluetooth AMP Circuit Board 】 2.1 Channel | TPA3221 Pair | 100W + 100W + 200W High Power

🎧 Support Bluetooth 5.1 + AUX + USB Drive + Sound Card

📱 Control via Wuzhi Audio mobile app on both Android and iOS.

🎶 2.1 Channel Audio System: Left + Right + Subwoofer

💥 Two TI TPA3221 amplification chips. Sound sharp, powerful.

📦 Suitable for DIY and extension

2025/9/21 Edited to

... Read moreหลังลองเล่นแผง ZK‑ST21 อยู่พักนึง สิ่งที่คนค้นหาแล้วงงกันบ่อยคือ “สเปคจริง/ต่อวงจรยังไง/ต่างจาก TB21 Pro ไหม” เลยสรุปแบบใช้งานได้ทันทีไว้ตรงนี้ 1) สเปคที่ควรรู้ของ ZK‑ST21 - ระบบ 2.1CH: ขับลำโพงซ้าย+ขวา และซับวูฟเฟอร์แยกช่อง - ชิปขยายเสียง: TI TPA3221 แบบคู่ (จุดเด่นคือกำลังขับสูงและเสียงค่อนข้างใส) - กำลังขับที่เจอในสเปคบอร์ด: 100W + 100W + 200W (ขึ้นกับแรงดันไฟ/โหลดลำโพง/ภาคจ่ายไฟ) - แหล่งสัญญาณเข้า: Bluetooth 5.1, AUX, USB Drive (และโหมดการ์ดเสียงตามที่บอร์ดรองรับ) - ควบคุมผ่านแอป: Wuzhi Audio (บางเครื่องใน OCR จะเห็นคล้าย “Wuzht/izhi” แต่ชื่อแอปที่หาเจอหลัก ๆ คือ Wuzhi Audio) - แรงดันไฟเลี้ยง: DC 12–30V (สำคัญมาก เพราะไฟตกจะทำให้เร่งไม่ขึ้น/เบสย้วย/ตัด) 2) ผังการต่อวงจรแบบที่ผมใช้งาน (พื้นฐานแต่ลดพลาด) - ไฟเข้า: ต่อ DC 12–30V เข้าขั้ว + และ – ให้แน่น ใช้สายไฟเส้นใหญ่หน่อยถ้าใช้กำลังสูง - ลำโพงซ้าย/ขวา: ต่อขั้ว L+ L- และ R+ R- ให้ตรงช่อง (อย่ารวมกราวด์ร่วม เพราะแอมป์คลาส D หลายรุ่นเป็นแบบ BTL) - ซับวูฟเฟอร์: ต่อที่ช่อง SUB+ SUB- (แนะนำซับ 4–8Ω แล้วดูความเหมาะสมของตู้/ดอก) - อินพุตสัญญาณ: ถ้าใช้ AUX ให้ลองลดเสียงที่ต้นทางก่อน แล้วค่อยเพิ่มที่บอร์ดเพื่อกันแตก 3) เลือกภาคจ่ายไฟให้เหมาะ (จุดที่ทำให้ “วัตต์ไม่ถึง” มากที่สุด) - ใช้ 12V จะขับได้ แต่เหมาะฟังทั่วไป/ลำโพงเล็ก - ถ้าอยากให้มีเฮดรูมและเบสแน่นขึ้น ผมมักเลือก 24V จะบาลานซ์ดี - ถ้าเล่นหนักและลำโพงกินกำลัง แหล่งจ่ายต้องจ่ายกระแสได้จริง (PSU คุณภาพ/สายไม่เล็กเกิน) 4) ZK‑ST21 vs TB21 Pro ต่างกันยังไง (แนวทางเลือก) - ถ้าคุณโฟกัสกำลังขับ 2.1CH และอยากได้ชิป TPA3221 คู่: ZK‑ST21 ตอบโจทย์ - ถ้าคุณกำลังเทียบกับ TB21 Pro/วงจร ZK TB21: ให้ดูเรื่องอินพุตที่ต้องใช้ (USB/BT/แอป) และแรงดันที่รองรับเป็นหลัก เพราะแต่ละบอร์ดจัดชุดฟังก์ชันไม่เหมือนกัน 5) ทิปแก้ปัญหาที่พบบ่อย - ต่อแล้วไม่มีเสียง: เช็กโหมดอินพุต (BT/AUX/USB) และระดับเสียงในแอป Wuzhi Audio - เสียงฮัม/จี่: เปลี่ยนอะแดปเตอร์เป็นแบบคุณภาพ, จัดสายสัญญาณให้ห่างสายไฟ, ยึดกราวด์ให้แน่น - เสียงแตกเวลาเร่ง: ไฟไม่พอ/ลำโพงอิมพีแดนซ์ไม่เหมาะ/เร่งต้นทางแรงเกิน ให้ไล่ลดทีละจุด ใครกำลังหา “ลายวงจร/ผังต่อ” ของ ZK‑ST21 (หรือเทียบกับ TB21 Pro, ZK MT21) แนะนำเริ่มจากเช็กขั้วต่อบนบอร์ดตามสกรีน + เลือกไฟ DC 12–30V ที่จ่ายกระแสไหว แค่นี้โอกาสจบงาน DIY แบบไม่ปวดหัวจะสูงขึ้นมาก

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