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                    [data_html] => <footer id="footer">
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)

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02-435-2345 ต่อ 114, 115, 116

“บีบแตร” เพื่อส่งสัญญาณให้ผู้อื่นรู้


หน้าที่หลักของ “แตร” ก็คือผลิตเสียงสัญญาณเพื่อเตือนให้ผู้ใช้ถนนได้ทราบ โดยเสียงของแตรเกิดจากการสั่นสะเทือนของไดอะแฟรมภายในแตร ปกติในวงจรแตรจะนิยมใช้แตร 2 ตัวเป็นแตรเสียงต่ำ 1 ตัวและแตรเสียงสูงอีก 1 ตัว โดยวงจรแตรที่ใช้ในรถยนต์มี 2 แบบคือ วงจรแตรแบบธรรมดา และ วงจรแตรแบบใช้รีเลย์

 



ในวงจรแตรแบบธรรมดาเวลาแตรทำงานจะมีกระแสไฟฟ้าจำนวนมากที่ผ่านสวิตช์แตร ทำให้สวิตช์ร้อนเป็นเหตุให้สวิตช์แตรมีอายุการใช้งานสั้น ดังนั้นในปัจจุบันจึงหันมาใช้วงจรแตรแบบใช้รีเลย์กัน

การทำงานของแตรแบบใช้รีเลย์ก็คือเมื่อกดสวิตช์แตรกระแสไฟฟ้าจากแบตเตอรี่จะผ่านฟิวส์แตร ผ่านขั้วเข้า B ของรีเลย์แตร ผ่านคอยล์ในรีเลย์ ผ่านขั้ว S ของรีเลย์แตร ผ่านเข้าสวิตช์แตรแล้วลงกราวด์ครบวงจร ทำให้แกนเหล็กอ่อนที่คอยล์พันอยู่เกิดอำนาจแม่เหล็ก ดูดคอนแทกของรีเลย์ให้ต่อกัน กระแสไฟฟ้าจากแบตเตอรี่จะผ่านคอนแทกที่ต่อกัน ผ่านขั้ว H ของรีเลย์แตร ผ่านเข้าขั้วบวกของแตร ผ่านออกขั้วลบของแตรแล้วลงกราวด์ ครบวงจรทำให้แตรทำงาน ในวงจรนี้กระแสไฟฟ้าที่ผ่านสวิตช์แตรเป็นกระแสไฟฟ้าจำนวนน้อยที่ผ่านเข้าเลี้ยงคอยล์ของรีเลย์จึงช่วยยืดอายุการทำงานของสวิตช์แตร

 



อย่างไรก็ตาม แม้ว่าเราอาจจะพอรู้เรื่องของวงจร แตร แต่ส่วนใหญ่เมื่อแตรเสีย อันเนื่องมาจากหลายสาเหตุ สาเหตุหลักๆ อาจจะเกิดจากฟิวส์ของแตรที่ขาด ซึ่งก็ต้องตรวจสอบกันก่อนอาจเกิดการลัดวงจรหรือใช้ฟิวส์ไม่เหมาะสม ส่วนการเปลี่ยนแตรตัวใหม่ นั้นสามารถลงมือทำกันได้ไม่ยาก แต่ก็ต้องหาตำแหน่งของการติดตั้ง “แตร” ก่อน อาจใช้แต่รูปแบบเดิมเพื่อการติดตั้งที่สะดวก หรือแตรรูปแบบอื่นๆ ก็ต้องมีการดัดแปลงจุดยึดกันเล็กน้อย ส่วนเรื่องสายไฟ ส่วนใหญ่ก็จะมีการเดินเอาไว้อยู่แล้ว เว้นแต่สายไฟสึกหรอมีอายุการใช้งานมายาวนาน ก็อาจต้องรื้อเปลี่ยนใหม่

 



สำหรับการเลือกแตรรถยนต์มาใช้นั้น ก็ควรเลือกให้เหมาะสมกับรถของเรา ซึ่งประเภทของแตรมีอยู่ด้วยกันหลายชนิด ตั้งแต่แตรไฟฟ้าแบบธรรมดา แตรหอยโข่ง แตรลม ซึ่งสองชนิดหลังนี้รถยนต์เล็กๆ อาจไม่เหมาะสมนัก ส่วนใหญ่ก็จะใช้แตรไฟฟ้าปรกติ ซึ่งถ้าเป็นแตรที่มีจำหน่ายทั่วไปก็จะมีให้เลือกอีกว่ามีโทนเสียงอย่างไร ลิ้นเป็นแบบไหน ซึ่งก็ควรจะเลือกลิ้นที่เป็นประเภทกันน้ำได้จะมีอายุการใช้งานที่ยาวนานกว่านั่นเอง

 

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