{"id":45156,"date":"2023-04-22T03:02:45","date_gmt":"2023-04-22T08:02:45","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-a-high-frequency-sound-generator\/"},"modified":"2025-01-21T07:16:56","modified_gmt":"2025-01-21T12:16:56","slug":"how-to-make-a-high-frequency-sound-generator","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-a-high-frequency-sound-generator\/","title":{"rendered":"T\u1ef1 Ch\u1ebf M\u00e1y Ph\u00e1t \u00c2m T\u1ea7n S\u1ed1 Cao"},"content":{"rendered":"

\u00c2m thanh cao t\u1ea7n, th\u01b0\u1eddng n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb v\u00e0 thi\u1ebft th\u1ef1c, t\u1eeb ki\u1ec3m tra v\u1eadt li\u1ec7u \u0111\u1ebfn xua \u0111u\u1ed5i c\u00f4n tr\u00f9ng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n \u0111\u01a1n gi\u1ea3n.<\/p>\n

Nguy\u00ean L\u00fd Ho\u1ea1t \u0110\u1ed9ng<\/h3>\n

M\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd t\u1ea1o ra dao \u0111\u1ed9ng \u0111i\u1ec7n \u1edf t\u1ea7n s\u1ed1 cao, sau \u0111\u00f3 chuy\u1ec3n \u0111\u1ed5i th\u00e0nh dao \u0111\u1ed9ng c\u01a1 h\u1ecdc c\u1ee7a loa ho\u1eb7c b\u1ed9 ph\u1eadn rung \u0111\u1ec3 ph\u00e1t ra \u00e2m thanh. T\u1ea7n s\u1ed1 c\u1ee7a \u00e2m thanh \u0111\u01b0\u1ee3c quy\u1ebft \u0111\u1ecbnh b\u1edfi t\u1ea7n s\u1ed1 c\u1ee7a dao \u0111\u1ed9ng \u0111i\u1ec7n.<\/p>\n

Linh Ki\u1ec7n C\u1ea7n Thi\u1ebft<\/h3>\n

\u0110\u1ec3 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n, 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
IC 555<\/td>\nB\u1ed9 t\u1ea1o xung \u0111a h\u00e0i<\/td>\n1<\/td>\n<\/tr>\n
\u0110i\u1ec7n tr\u1edf<\/td>\nC\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau (xem s\u01a1 \u0111\u1ed3 m\u1ea1ch)<\/td>\nTheo s\u01a1 \u0111\u1ed3<\/td>\n<\/tr>\n
T\u1ee5 \u0111i\u1ec7n<\/td>\nC\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau (xem s\u01a1 \u0111\u1ed3 m\u1ea1ch)<\/td>\nTheo s\u01a1 \u0111\u1ed3<\/td>\n<\/tr>\n
Loa piezo<\/td>\nLoa g\u1ed1m \u00e1p \u0111i\u1ec7n<\/td>\n1<\/td>\n<\/tr>\n
Ngu\u1ed3n \u0111i\u1ec7n<\/td>\nPin 9V ho\u1eb7c ngu\u1ed3n DC t\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/td>\n1<\/td>\n<\/tr>\n
B\u1ea3ng m\u1ea1ch<\/td>\nB\u1ea3ng m\u1ea1ch th\u1eed nghi\u1ec7m ho\u1eb7c m\u1ea1ch in<\/td>\n1<\/td>\n<\/tr>\n
D\u00e2y n\u1ed1i<\/td>\nD\u00e2y \u0111i\u1ec7n<\/td>\nV\u1eeba \u0111\u1ee7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

S\u01a1 \u0110\u1ed3 M\u1ea1ch \u0110i\u1ec7n<\/h3>\n

S\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n cho m\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n s\u1eed d\u1ee5ng IC 555 \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y d\u01b0\u1edbi \u0111\u00e2y. B\u1ea1n c\u1ea7n k\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n theo \u0111\u00fang s\u01a1 \u0111\u1ed3 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c. Vi\u1ec7c thay \u0111\u1ed5i gi\u00e1 tr\u1ecb c\u1ee7a \u0111i\u1ec7n tr\u1edf v\u00e0 t\u1ee5 \u0111i\u1ec7n s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n s\u1ed1 \u00e2m thanh \u0111\u01b0\u1ee3c t\u1ea1o ra.<\/p>\n

(Ch\u00e8n h\u00ecnh \u1ea3nh s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n v\u1edbi IC 555 t\u1ea1i \u0111\u00e2y. V\u00ec \u0111\u00e2y l\u00e0 text-based, kh\u00f4ng th\u1ec3 ch\u00e8n h\u00ecnh \u1ea3nh, n\u00ean b\u1ea1n c\u1ea7n t\u1ef1 t\u00ecm ho\u1eb7c v\u1ebd s\u01a1 \u0111\u1ed3 m\u1ea1ch IC 555 astable multivibrator v\u00e0 ch\u00e8n v\u00e0o b\u00e0i vi\u1ebft.)<\/strong><\/p>\n

H\u01b0\u1edbng D\u1eabn L\u1eafp R\u00e1p<\/h3>\n
    \n
  1. \u0110\u1eb7t c\u00e1c linh ki\u1ec7n l\u00ean b\u1ea3ng m\u1ea1ch theo s\u01a1 \u0111\u1ed3.<\/li>\n
  2. H\u00e0n c\u00e1c ch\u00e2n linh ki\u1ec7n v\u00e0o b\u1ea3ng m\u1ea1ch. \u0110\u1ea3m b\u1ea3o c\u00e1c m\u1ed1i h\u00e0n ch\u1eafc ch\u1eafn v\u00e0 kh\u00f4ng b\u1ecb ch\u1ea1m m\u1ea1ch.<\/li>\n
  3. K\u1ebft n\u1ed1i loa piezo v\u1edbi m\u1ea1ch \u0111i\u1ec7n.<\/li>\n
  4. K\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n.<\/li>\n<\/ol>\n

    \u0110i\u1ec1u Ch\u1ec9nh T\u1ea7n S\u1ed1<\/h3>\n

    T\u1ea7n s\u1ed1 c\u1ee7a \u00e2m thanh \u0111\u01b0\u1ee3c t\u1ea1o ra c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i gi\u00e1 tr\u1ecb c\u1ee7a \u0111i\u1ec7n tr\u1edf v\u00e0 t\u1ee5 \u0111i\u1ec7n trong m\u1ea1ch. C\u00f4ng th\u1ee9c t\u00ednh t\u1ea7n s\u1ed1 cho m\u1ea1ch IC 555 astable l\u00e0: f = 1.44 \/ ((R1 + 2R2) <\/em> C). B\u1ea1n c\u00f3 th\u1ec3 th\u1eed nghi\u1ec7m v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ea7n s\u1ed1 mong mu\u1ed1n.<\/p>\n

    Ki\u1ec3m Tra Ho\u1ea1t \u0110\u1ed9ng<\/h3>\n

    Sau khi l\u1eafp r\u00e1p xong, k\u1ebft n\u1ed1i ngu\u1ed3n \u0111i\u1ec7n. N\u1ebfu m\u1ea1ch ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c, b\u1ea1n s\u1ebd nghe th\u1ea5y \u00e2m thanh cao t\u1ea7n ph\u00e1t ra t\u1eeb loa piezo. N\u1ebfu kh\u00f4ng nghe th\u1ea5y \u00e2m thanh, h\u00e3y ki\u1ec3m tra l\u1ea1i c\u00e1c m\u1ed1i h\u00e0n v\u00e0 \u0111\u1ea3m b\u1ea3o c\u00e1c linh ki\u1ec7n \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i \u0111\u00fang.<\/p>\n

    \u1ee8ng D\u1ee5ng<\/h3>\n

    M\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, t\u1eeb xua \u0111u\u1ed5i c\u00f4n tr\u00f9ng, hu\u1ea5n luy\u1ec7n ch\u00f3 \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng trong y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p. Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd r\u1eb1ng vi\u1ec7c ti\u1ebfp x\u00fac v\u1edbi \u00e2m thanh cao t\u1ea7n \u1edf c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn trong th\u1eddi gian d\u00e0i c\u00f3 th\u1ec3 g\u00e2y h\u1ea1i cho s\u1ee9c kh\u1ecfe.<\/p>\n

    Vi\u1ec7c ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p v\u1edbi nh\u1eefng linh ki\u1ec7n d\u1ec5 t\u00ecm v\u00e0 chi ph\u00ed th\u1ea5p. 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 v\u00e0 h\u01b0\u1edbng d\u1eabn chi ti\u1ebft \u0111\u1ec3 t\u1ef1 tay th\u1ef1c hi\u1ec7n. H\u00e3y nh\u1edb lu\u00f4n c\u1ea9n th\u1eadn khi l\u00e0m vi\u1ec7c v\u1edbi \u0111i\u1ec7n v\u00e0 t\u00ecm hi\u1ec3u k\u1ef9 v\u1ec1 an to\u00e0n \u0111i\u1ec7n tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u.<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u00c2m thanh cao t\u1ea7n, th\u01b0\u1eddng n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi, c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u00fa v\u1ecb v\u00e0 thi\u1ebft th\u1ef1c, t\u1eeb ki\u1ec3m tra v\u1eadt li\u1ec7u \u0111\u1ebfn xua \u0111u\u1ed5i c\u00f4n tr\u00f9ng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t \u00e2m thanh cao t\u1ea7n \u0111\u01a1n gi\u1ea3n. Nguy\u00ean L\u00fd Ho\u1ea1t \u0110\u1ed9ng<\/p>\n","protected":false},"author":1,"featured_media":26474,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-45156","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\/45156","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=45156"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/45156\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/26474"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=45156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=45156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=45156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}