{"id":47564,"date":"2023-04-22T00:12:03","date_gmt":"2023-04-22T05:12:03","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-ultrasonic-speaker\/"},"modified":"2025-01-21T07:20:36","modified_gmt":"2025-01-21T12:20:36","slug":"how-to-make-ultrasonic-speaker","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-ultrasonic-speaker\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn ch\u1ebf t\u1ea1o loa si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n"},"content":{"rendered":"

Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t loa si\u00eau \u00e2m c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb v\u00e0 mang t\u00ednh gi\u00e1o d\u1ee5c, cho ph\u00e9p b\u1ea1n t\u00ecm hi\u1ec3u v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a s\u00f3ng \u00e2m t\u1ea7n s\u1ed1 cao. M\u1eb7c d\u00f9 vi\u1ec7c ch\u1ebf t\u1ea1o loa si\u00eau \u00e2m ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n v\u00e0 thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng, b\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1c b\u01b0\u1edbc c\u01a1 b\u1ea3n \u0111\u1ec3 t\u1ea1o ra m\u1ed9t loa si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n.<\/p>\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a loa si\u00eau \u00e2m<\/h3>\n

Loa si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean t\u1eafc \u00e1p \u0111i\u1ec7n, s\u1eed d\u1ee5ng m\u1ed9t v\u1eadt li\u1ec7u \u0111\u1eb7c bi\u1ec7t g\u1ecdi l\u00e0 tinh th\u1ec3 \u00e1p \u0111i\u1ec7n. Khi \u0111\u01b0\u1ee3c \u00e1p m\u1ed9t \u0111i\u1ec7n \u00e1p, tinh th\u1ec3 n\u00e0y s\u1ebd thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng, t\u1ea1o ra c\u00e1c rung \u0111\u1ed9ng c\u01a1 h\u1ecdc \u1edf t\u1ea7n s\u1ed1 si\u00eau \u00e2m (tr\u00ean 20kHz). C\u00e1c rung \u0111\u1ed9ng n\u00e0y \u0111\u01b0\u1ee3c truy\u1ec1n v\u00e0o kh\u00f4ng kh\u00ed, t\u1ea1o th\u00e0nh s\u00f3ng si\u00eau \u00e2m.<\/p>\n

Linh ki\u1ec7n c\u1ea7n thi\u1ebft<\/h3>\n

\u0110\u1ec3 ch\u1ebf t\u1ea1o loa si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n, b\u1ea1n c\u1ea7n chu\u1ea9n b\u1ecb c\u00e1c linh ki\u1ec7n sau:<\/p>\n\n\n\n\n\n\n\n\n\n
Linh ki\u1ec7n<\/th>\nM\u00f4 t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
Tinh th\u1ec3 \u00e1p \u0111i\u1ec7n<\/td>\nB\u1ed9 ph\u1eadn ch\u00ednh t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m.<\/td>\n<\/tr>\n
B\u1ed9 dao \u0111\u1ed9ng<\/td>\nT\u1ea1o ra t\u00edn hi\u1ec7u \u0111i\u1ec7n \u00e1p \u1edf t\u1ea7n s\u1ed1 si\u00eau \u00e2m \u0111\u1ec3 k\u00edch ho\u1ea1t tinh th\u1ec3 \u00e1p \u0111i\u1ec7n.<\/td>\n<\/tr>\n
Ngu\u1ed3n \u0111i\u1ec7n<\/td>\nCung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho b\u1ed9 dao \u0111\u1ed9ng.<\/td>\n<\/tr>\n
V\u1ecf loa<\/td>\n\u0110\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t bu\u1ed3ng c\u1ed9ng h\u01b0\u1edfng, gi\u00fap khu\u1ebfch \u0111\u1ea1i \u00e2m thanh.<\/td>\n<\/tr>\n
D\u00e2y n\u1ed1i<\/td>\nK\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n l\u1ea1i v\u1edbi nhau.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n<\/h3>\n
    \n
  1. L\u1eafp r\u00e1p m\u1ea1ch \u0111i\u1ec7n:<\/strong> K\u1ebft n\u1ed1i tinh th\u1ec3 \u00e1p \u0111i\u1ec7n v\u1edbi b\u1ed9 dao \u0111\u1ed9ng v\u00e0 ngu\u1ed3n \u0111i\u1ec7n theo s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n. \u0110\u1ea3m b\u1ea3o c\u00e1c k\u1ebft n\u1ed1i ch\u1eafc ch\u1eafn v\u00e0 \u0111\u00fang c\u1ef1c.<\/li>\n
  2. G\u1eafn tinh th\u1ec3 v\u00e0o v\u1ecf loa:<\/strong> C\u1ed1 \u0111\u1ecbnh tinh th\u1ec3 \u00e1p \u0111i\u1ec7n v\u00e0o v\u1ecf loa b\u1eb1ng keo ho\u1eb7c b\u0103ng d\u00ednh. V\u1ecb tr\u00ed \u0111\u1eb7t tinh th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a loa.<\/li>\n
  3. Ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng:<\/strong> C\u1ea5p ngu\u1ed3n cho m\u1ea1ch \u0111i\u1ec7n v\u00e0 ki\u1ec3m tra xem loa c\u00f3 ph\u00e1t ra s\u00f3ng si\u00eau \u00e2m hay kh\u00f4ng. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t microphone si\u00eau \u00e2m ho\u1eb7c \u1ee9ng d\u1ee5ng \u0111o t\u1ea7n s\u1ed1 tr\u00ean \u0111i\u1ec7n tho\u1ea1i \u0111\u1ec3 ki\u1ec3m tra.<\/li>\n<\/ol>\n

    L\u1ef1a ch\u1ecdn t\u1ea7n s\u1ed1<\/h3>\n

    T\u1ea7n s\u1ed1 si\u00eau \u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee7a loa. V\u00ed d\u1ee5, t\u1ea7n s\u1ed1 40kHz th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng l\u00e0m s\u1ea1ch b\u1eb1ng si\u00eau \u00e2m. B\u1ea1n c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh b\u1ed9 dao \u0111\u1ed9ng \u0111\u1ec3 t\u1ea1o ra t\u1ea7n s\u1ed1 mong mu\u1ed1n.<\/p>\n

    Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1<\/h3>\n

    N\u1ebfu loa kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng, h\u00e3y ki\u1ec3m tra l\u1ea1i c\u00e1c k\u1ebft n\u1ed1i, ngu\u1ed3n \u0111i\u1ec7n v\u00e0 tinh th\u1ec3 \u00e1p \u0111i\u1ec7n. \u0110\u1ea3m b\u1ea3o tinh th\u1ec3 \u00e1p \u0111i\u1ec7n kh\u00f4ng b\u1ecb h\u1ecfng v\u00e0 b\u1ed9 dao \u0111\u1ed9ng \u0111ang ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 ch\u00ednh x\u00e1c.<\/p>\n

    Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o loa si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi s\u1ef1 ki\u00ean nh\u1eabn v\u00e0 t\u1ec9 m\u1ec9. K\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c ch\u1ea5t l\u01b0\u1ee3ng nh\u01b0 c\u00e1c s\u1ea3n ph\u1ea9m th\u01b0\u01a1ng m\u1ea1i, nh\u01b0ng \u0111\u00e2y l\u00e0 m\u1ed9t c\u00e1ch tuy\u1ec7t v\u1eddi \u0111\u1ec3 h\u1ecdc h\u1ecfi v\u00e0 kh\u00e1m ph\u00e1 v\u1ec1 c\u00f4ng ngh\u1ec7 si\u00eau \u00e2m. N\u00ean nh\u1edb r\u1eb1ng s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 g\u00e2y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ee9c kh\u1ecfe n\u1ebfu ti\u1ebfp x\u00fac \u1edf c\u01b0\u1eddng \u0111\u1ed9 cao trong th\u1eddi gian d\u00e0i, v\u00ec v\u1eady h\u00e3y c\u1ea9n tr\u1ecdng trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t loa si\u00eau \u00e2m c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb v\u00e0 mang t\u00ednh gi\u00e1o d\u1ee5c, cho ph\u00e9p b\u1ea1n t\u00ecm hi\u1ec3u v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a s\u00f3ng \u00e2m t\u1ea7n s\u1ed1 cao. M\u1eb7c d\u00f9 vi\u1ec7c ch\u1ebf t\u1ea1o loa si\u00eau \u00e2m ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n v\u00e0<\/p>\n","protected":false},"author":1,"featured_media":26478,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-47564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/47564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=47564"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/47564\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26478"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=47564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=47564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=47564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}