{"id":51436,"date":"2023-04-21T13:50:18","date_gmt":"2023-04-21T18:50:18","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/diy-ultrasonic-speaker\/"},"modified":"2025-01-21T07:10:20","modified_gmt":"2025-01-21T12:10:20","slug":"diy-ultrasonic-speaker","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/diy-ultrasonic-speaker\/","title":{"rendered":"T\u1ef1 ch\u1ebf loa si\u00eau \u00e2m: H\u01b0\u1edbng d\u1eabn chi ti\u1ebft t\u1eeb A \u0111\u1ebfn Z"},"content":{"rendered":"<p>Loa si\u00eau \u00e2m, kh\u00e1c v\u1edbi loa th\u00f4ng th\u01b0\u1eddng, ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd t\u1ea1o ra s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi.  \u1ee8ng d\u1ee5ng c\u1ee7a ch\u00fang r\u1ea5t \u0111a d\u1ea1ng, t\u1eeb c\u00e1c thi\u1ebft b\u1ecb \u0111u\u1ed5i c\u00f4n tr\u00f9ng, c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch cho \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng trong y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p.  Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t chi\u1ebfc loa si\u00eau \u00e2m, tuy c\u00f3 \u0111\u00f4i ch\u00fat ph\u1ee9c t\u1ea1p, nh\u01b0ng l\u1ea1i l\u00e0 m\u1ed9t tr\u1ea3i nghi\u1ec7m th\u00fa v\u1ecb v\u00e0 b\u1ed5 \u00edch cho nh\u1eefng ai y\u00eau th\u00edch \u0111i\u1ec7n t\u1eed. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch l\u00e0m m\u1ed9t chi\u1ebfc loa si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n t\u1ea1i nh\u00e0.<\/p>\n<h3>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a loa si\u00eau \u00e2m t\u1ef1 ch\u1ebf<\/h3>\n<p>Loa si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n.  M\u1ed9t t\u00edn hi\u1ec7u \u0111i\u1ec7n xoay chi\u1ec1u \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n (th\u01b0\u1eddng l\u00e0 g\u1ed1m \u00e1p \u0111i\u1ec7n) s\u1ebd khi\u1ebfn v\u1eadt li\u1ec7u n\u00e0y dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng. Dao \u0111\u1ed9ng n\u00e0y t\u1ea1o ra s\u00f3ng \u00e2m, v\u00e0 n\u1ebfu t\u1ea7n s\u1ed1 \u0111\u1ee7 cao (tr\u00ean 20kHz), ch\u00fang ta s\u1ebd c\u00f3 s\u00f3ng si\u00eau \u00e2m.<\/p>\n<h3>Linh ki\u1ec7n c\u1ea7n chu\u1ea9n b\u1ecb<\/h3>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Linh ki\u1ec7n<\/th>\n<th>M\u00f4 t\u1ea3<\/th>\n<th>S\u1ed1 l\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>G\u1ed1m \u00e1p \u0111i\u1ec7n<\/td>\n<td>\u0110\u01b0\u1eddng k\u00ednh kho\u1ea3ng 20mm<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 dao \u0111\u1ed9ng<\/td>\n<td>C\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>Loa th\u01b0\u1eddng<\/td>\n<td>Lo\u1ea1i nh\u1ecf, c\u00f4ng su\u1ea5t th\u1ea5p<\/td>\n<td>1 (t\u00f9y ch\u1ecdn)<\/td>\n<\/tr>\n<tr>\n<td>Ngu\u1ed3n \u0111i\u1ec7n<\/td>\n<td>9V ho\u1eb7c 12V<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>D\u00e2y n\u1ed1i<\/td>\n<td>\u0110\u1ee7 lo\u1ea1i<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3ng m\u1ea1ch th\u1eed nghi\u1ec7m (breadboard)<\/td>\n<td>\u0110\u1ec3 d\u1ec5 d\u00e0ng l\u1eafp r\u00e1p v\u00e0 th\u1eed nghi\u1ec7m<\/td>\n<td>1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n<\/h3>\n<ol>\n<li>K\u1ebft n\u1ed1i b\u1ed9 dao \u0111\u1ed9ng v\u1edbi ngu\u1ed3n \u0111i\u1ec7n. \u0110\u1ea3m b\u1ea3o \u0111\u00fang c\u1ef1c t\u00ednh \u0111\u1ec3 tr\u00e1nh l\u00e0m h\u1ecfng linh ki\u1ec7n.<\/li>\n<li>\u0110i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1 c\u1ee7a b\u1ed9 dao \u0111\u1ed9ng l\u00ean tr\u00ean 20kHz.  B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 \u0111o t\u1ea7n s\u1ed1 \u0111\u1ec3 ki\u1ec3m tra.<\/li>\n<li>N\u1ed1i \u0111\u1ea7u ra c\u1ee7a b\u1ed9 dao \u0111\u1ed9ng v\u1edbi g\u1ed1m \u00e1p \u0111i\u1ec7n.<\/li>\n<li>N\u1ebfu mu\u1ed1n nghe \u0111\u01b0\u1ee3c \u00e2m thanh (\u0111\u1ec3 ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng ban \u0111\u1ea7u), b\u1ea1n c\u00f3 th\u1ec3 n\u1ed1i song song m\u1ed9t loa th\u01b0\u1eddng v\u1edbi g\u1ed1m \u00e1p \u0111i\u1ec7n. L\u01b0u \u00fd r\u1eb1ng loa th\u01b0\u1eddng ch\u1ec9 ph\u00e1t ra \u00e2m thanh \u1edf t\u1ea7n s\u1ed1 th\u1ea5p, b\u1ea1n s\u1ebd ch\u1ec9 nghe th\u1ea5y ti\u1ebfng &quot;r\u00e8 r\u00e8&quot; n\u1ebfu t\u1ea7n s\u1ed1 c\u1ee7a b\u1ed9 dao \u0111\u1ed9ng ch\u01b0a \u0111\u1ee7 cao.<\/li>\n<li>Sau khi l\u1eafp r\u00e1p xong, c\u1ea5p ngu\u1ed3n cho m\u1ea1ch. G\u1ed1m \u00e1p \u0111i\u1ec7n s\u1ebd b\u1eaft \u0111\u1ea7u dao \u0111\u1ed9ng v\u00e0 ph\u00e1t ra s\u00f3ng si\u00eau \u00e2m.<\/li>\n<\/ol>\n<h3>Ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng<\/h3>\n<p>Vi\u1ec7c ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng c\u1ee7a loa si\u00eau \u00e2m t\u1ef1 ch\u1ebf c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n b\u1eb1ng m\u1ed9t s\u1ed1 c\u00e1ch:<\/p>\n<ul>\n<li>S\u1eed d\u1ee5ng microphone si\u00eau \u00e2m: \u0110\u00e2y l\u00e0 c\u00e1ch ch\u00ednh x\u00e1c nh\u1ea5t \u0111\u1ec3 ki\u1ec3m tra t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a s\u00f3ng si\u00eau \u00e2m.<\/li>\n<li>Quan s\u00e1t ph\u1ea3n \u1ee9ng c\u1ee7a \u0111\u1ed9ng v\u1eadt: M\u1ed9t s\u1ed1 lo\u00e0i \u0111\u1ed9ng v\u1eadt, nh\u01b0 ch\u00f3, m\u00e8o, c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c s\u00f3ng si\u00eau \u00e2m.  B\u1ea1n c\u00f3 th\u1ec3 quan s\u00e1t ph\u1ea3n \u1ee9ng c\u1ee7a ch\u00fang \u0111\u1ec3 bi\u1ebft loa c\u00f3 ho\u1ea1t \u0111\u1ed9ng hay kh\u00f4ng.<\/li>\n<li>S\u1eed d\u1ee5ng \u1ee9ng d\u1ee5ng \u0111o t\u1ea7n s\u1ed1 tr\u00ean \u0111i\u1ec7n tho\u1ea1i: M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng tr\u00ean \u0111i\u1ec7n tho\u1ea1i c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 \u0111o t\u1ea7n s\u1ed1 si\u00eau \u00e2m, tuy nhi\u00ean \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng cao.<\/li>\n<\/ul>\n<h3>\u1ee8ng d\u1ee5ng c\u1ee7a loa si\u00eau \u00e2m t\u1ef1 ch\u1ebf<\/h3>\n<p>Loa si\u00eau \u00e2m t\u1ef1 ch\u1ebf c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng \u0111\u01a1n gi\u1ea3n nh\u01b0:<\/p>\n<ul>\n<li>\u0110u\u1ed5i c\u00f4n tr\u00f9ng: M\u1ed9t s\u1ed1 lo\u00e0i c\u00f4n tr\u00f9ng nh\u1ea1y c\u1ea3m v\u1edbi s\u00f3ng si\u00eau \u00e2m.<\/li>\n<li>L\u00e0m c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch: B\u1eb1ng c\u00e1ch \u0111o th\u1eddi gian s\u00f3ng si\u00eau \u00e2m ph\u1ea3n h\u1ed3i l\u1ea1i, ta c\u00f3 th\u1ec3 t\u00ednh to\u00e1n \u0111\u01b0\u1ee3c kho\u1ea3ng c\u00e1ch \u0111\u1ebfn v\u1eadt c\u1ea3n.<\/li>\n<\/ul>\n<p>Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o loa si\u00eau \u00e2m kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3 m\u00e0 c\u00f2n mang l\u1ea1i s\u1ef1 th\u1ecfa m\u00e3n khi ho\u00e0n th\u00e0nh m\u1ed9t s\u1ea3n ph\u1ea9m \u0111i\u1ec7n t\u1eed.  Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd 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 trong th\u1eddi gian d\u00e0i v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 cao. V\u00ec v\u1eady, h\u00e3y s\u1eed d\u1ee5ng loa si\u00eau \u00e2m m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn v\u00e0 c\u00f3 tr\u00e1ch nhi\u1ec7m.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Loa si\u00eau \u00e2m, kh\u00e1c v\u1edbi loa th\u00f4ng th\u01b0\u1eddng, ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd t\u1ea1o ra s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi. \u1ee8ng d\u1ee5ng c\u1ee7a ch\u00fang r\u1ea5t \u0111a d\u1ea1ng, t\u1eeb c\u00e1c thi\u1ebft b\u1ecb \u0111u\u1ed5i c\u00f4n tr\u00f9ng, c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch cho \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng trong y t\u1ebf 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-51436","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\/51436","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=51436"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/51436\/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=51436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=51436"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=51436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}