{"id":48684,"date":"2023-04-21T23:05:55","date_gmt":"2023-04-22T04:05:55","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-an-ultrasonic-sound-generator\/"},"modified":"2025-01-21T07:17:50","modified_gmt":"2025-01-21T12:17:50","slug":"how-to-make-an-ultrasonic-sound-generator","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-an-ultrasonic-sound-generator\/","title":{"rendered":"T\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n hi\u1ec7u qu\u1ea3"},"content":{"rendered":"

\u00c2m thanh si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb v\u00e0 th\u1ef1c ti\u1ec5n, t\u1eeb c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch \u0111\u1ebfn l\u00e0m s\u1ea1ch \u0111\u1ed3 trang s\u1ee9c. Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t \u00e2m thanh si\u00eau \u00e2m tuy kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p nh\u01b0ng \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft nh\u1ea5t \u0111\u1ecbnh v\u1ec1 \u0111i\u1ec7n t\u1eed. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch l\u00e0m m\u1ed9t m\u00e1y ph\u00e1t si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n, c\u00f9ng v\u1edbi nh\u1eefng l\u01b0u \u00fd quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh th\u1ef1c hi\u1ec7n.<\/p>\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y ph\u00e1t si\u00eau \u00e2m<\/h3>\n

M\u00e1y ph\u00e1t si\u00eau \u00e2m ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n. M\u1ed9t s\u1ed1 lo\u1ea1i v\u1eadt li\u1ec7u, v\u00ed d\u1ee5 nh\u01b0 th\u1ea1ch anh, c\u00f3 kh\u1ea3 n\u0103ng bi\u1ebfn \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc d\u01b0\u1edbi d\u1ea1ng dao \u0111\u1ed9ng v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Khi \u00e1p m\u1ed9t \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u v\u00e0o v\u1eadt li\u1ec7u \u00e1p \u0111i\u1ec7n, n\u00f3 s\u1ebd rung \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng. N\u1ebfu t\u1ea7n s\u1ed1 n\u00e0y n\u1eb1m trong v\u00f9ng si\u00eau \u00e2m (th\u01b0\u1eddng tr\u00ean 20kHz), ta s\u1ebd t\u1ea1o ra \u0111\u01b0\u1ee3c s\u00f3ng si\u00eau \u00e2m.<\/p>\n

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

\u0110\u1ec3 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t si\u00eau \u00e2m \u0111\u01a1n gi\u1ea3n, b\u1ea1n c\u1ea7n chu\u1ea9n b\u1ecb nh\u1eefng linh ki\u1ec7n sau:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Linh ki\u1ec7n<\/th>\nM\u00f4 t\u1ea3<\/th>\nS\u1ed1 l\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
B\u1ed9 dao \u0111\u1ed9ng 555<\/td>\nT\u1ea1o t\u00edn hi\u1ec7u xung vu\u00f4ng<\/td>\n1<\/td>\n<\/tr>\n
\u0110i\u1ec7n tr\u1edf<\/td>\nKh\u00e1c nhau, xem s\u01a1 \u0111\u1ed3 m\u1ea1ch<\/td>\nTheo s\u01a1 \u0111\u1ed3<\/td>\n<\/tr>\n
T\u1ee5 \u0111i\u1ec7n<\/td>\nKh\u00e1c nhau, xem s\u01a1 \u0111\u1ed3 m\u1ea1ch<\/td>\nTheo s\u01a1 \u0111\u1ed3<\/td>\n<\/tr>\n
Bi\u1ebfn tr\u1edf<\/td>\n\u0110i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1<\/td>\n1<\/td>\n<\/tr>\n
Loa si\u00eau \u00e2m (transducer)<\/td>\nPh\u00e1t ra s\u00f3ng si\u00eau \u00e2m<\/td>\n1<\/td>\n<\/tr>\n
Ngu\u1ed3n \u0111i\u1ec7n DC<\/td>\nCung c\u1ea5p \u0111i\u1ec7n cho m\u1ea1ch<\/td>\n1<\/td>\n<\/tr>\n
B\u1ea3ng m\u1ea1ch in<\/td>\nG\u1eafn c\u00e1c linh ki\u1ec7n<\/td>\n1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

S\u01a1 \u0111\u1ed3 m\u1ea1ch v\u00e0 c\u00e1ch l\u1eafp r\u00e1p<\/h3>\n

S\u01a1 \u0111\u1ed3 m\u1ea1ch kh\u00e1 \u0111\u01a1n gi\u1ea3n, s\u1eed d\u1ee5ng IC 555 \u1edf ch\u1ebf \u0111\u1ed9 astable multivibrator. B\u1ea1n c\u00f3 th\u1ec3 t\u00ecm ki\u1ebfm s\u01a1 \u0111\u1ed3 m\u1ea1ch "m\u00e1y ph\u00e1t si\u00eau \u00e2m 555" tr\u00ean internet. L\u01b0u \u00fd k\u1ebft n\u1ed1i ch\u00ednh x\u00e1c c\u00e1c ch\u00e2n c\u1ee7a IC 555 v\u1edbi \u0111i\u1ec7n tr\u1edf, t\u1ee5 \u0111i\u1ec7n v\u00e0 bi\u1ebfn tr\u1edf theo s\u01a1 \u0111\u1ed3. Loa si\u00eau \u00e2m \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi ng\u00f5 ra c\u1ee7a IC 555. Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf v\u00e0 t\u1ee5 \u0111i\u1ec7n s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n s\u1ed1 si\u00eau \u00e2m \u0111\u01b0\u1ee3c t\u1ea1o ra. B\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n t\u1ea7n s\u1ed1 ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 t\u00ednh to\u00e1n tr\u1ef1c tuy\u1ebfn.<\/p>\n

\u0110i\u1ec1u ch\u1ec9nh v\u00e0 ki\u1ec3m tra<\/h3>\n

Sau khi l\u1eafp r\u00e1p xong m\u1ea1ch, k\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n. S\u1eed d\u1ee5ng bi\u1ebfn tr\u1edf \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1. Vi\u1ec7c ki\u1ec3m tra s\u00f3ng si\u00eau \u00e2m c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t microphone k\u1ebft n\u1ed1i v\u1edbi m\u00e1y hi\u1ec7n s\u00f3ng. Tuy nhi\u00ean, do t\u1ea7n s\u1ed1 si\u00eau \u00e2m n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, b\u1ea1n s\u1ebd kh\u00f4ng nghe th\u1ea5y g\u00ec. M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng \u0111i\u1ec7n tho\u1ea1i c\u0169ng c\u00f3 th\u1ec3 gi\u00fap ph\u00e1t hi\u1ec7n s\u00f3ng si\u00eau \u00e2m, nh\u01b0ng \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng cao.<\/p>\n

\u1ee8ng d\u1ee5ng c\u1ee7a m\u00e1y ph\u00e1t si\u00eau \u00e2m t\u1ef1 ch\u1ebf<\/h3>\n

M\u00e1y ph\u00e1t si\u00eau \u00e2m t\u1ef1 ch\u1ebf c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong m\u1ed9t s\u1ed1 d\u1ef1 \u00e1n nh\u1ecf nh\u01b0: c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch, xua \u0111u\u1ed5i c\u00f4n tr\u00f9ng (hi\u1ec7u qu\u1ea3 c\u00f2n g\u00e2y tranh c\u00e3i), l\u00e0m s\u1ea1ch \u0111\u1ed3 v\u1eadt nh\u1ecf. Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd v\u1ec1 c\u01b0\u1eddng \u0111\u1ed9 v\u00e0 t\u1ea7n s\u1ed1 si\u00eau \u00e2m \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n.<\/p>\n

Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t si\u00eau \u00e2m l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb, gi\u00fap b\u1ea1n hi\u1ec3u h\u01a1n v\u1ec1 \u0111i\u1ec7n t\u1eed v\u00e0 s\u00f3ng si\u00eau \u00e2m. Tuy nhi\u00ean, c\u1ea7n c\u1ea9n th\u1eadn trong qu\u00e1 tr\u00ecnh th\u1ef1c hi\u1ec7n v\u00e0 t\u00ecm hi\u1ec3u k\u1ef9 v\u1ec1 an to\u00e0n khi l\u00e0m vi\u1ec7c v\u1edbi \u0111i\u1ec7n v\u00e0 si\u00eau \u00e2m. Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 cung c\u1ea5p cho b\u1ea1n nh\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ec3 b\u1eaft \u0111\u1ea7u.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c2m thanh si\u00eau \u00e2m, v\u1edbi t\u1ea7n s\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb v\u00e0 th\u1ef1c ti\u1ec5n, t\u1eeb c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch \u0111\u1ebfn l\u00e0m s\u1ea1ch \u0111\u1ed3 trang s\u1ee9c. Vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t \u00e2m thanh si\u00eau \u00e2m tuy kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p nh\u01b0ng \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u<\/p>\n","protected":false},"author":1,"featured_media":19251,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-48684","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\/48684","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=48684"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/48684\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19251"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=48684"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=48684"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=48684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}