{"id":45292,"date":"2023-04-22T02:59:24","date_gmt":"2023-04-22T07:59:24","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-frequency-generator\/"},"modified":"2025-01-21T07:18:33","modified_gmt":"2025-01-21T12:18:33","slug":"how-to-make-frequency-generator","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-frequency-generator\/","title":{"rendered":"T\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1: H\u01b0\u1edbng d\u1eabn chi ti\u1ebft"},"content":{"rendered":"<p>Vi\u1ec7c t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1, d\u00f9 \u0111\u01a1n gi\u1ea3n hay ph\u1ee9c t\u1ea1p, \u0111\u1ec1u \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 theo nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau, t\u1eeb nh\u1eefng m\u1ea1ch \u0111i\u1ec7n \u0111\u01a1n gi\u1ea3n cho \u0111\u1ebfn nh\u1eefng thi\u1ebft k\u1ebf ph\u1ee9c t\u1ea1p h\u01a1n.<\/p>\n<h3>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 \u0111\u01a1n gi\u1ea3n v\u1edbi IC 555<\/h3>\n<p>IC 555 l\u00e0 m\u1ed9t linh ki\u1ec7n \u0111a n\u0103ng v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra c\u00e1c m\u1ea1ch dao \u0111\u1ed9ng.  V\u1edbi v\u00e0i linh ki\u1ec7n c\u01a1 b\u1ea3n nh\u01b0 \u0111i\u1ec7n tr\u1edf, t\u1ee5 \u0111i\u1ec7n v\u00e0 IC 555, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 \u0111\u01a1n gi\u1ea3n. T\u1ea7n s\u1ed1 \u0111\u1ea7u 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.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Linh ki\u1ec7n<\/th>\n<th>Gi\u00e1 tr\u1ecb \u0111\u1ec1 ngh\u1ecb<\/th>\n<th>Ch\u00fa th\u00edch<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>IC 555<\/td>\n<td>1<\/td>\n<td>Timer IC<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n tr\u1edf R1<\/td>\n<td>10k\u03a9<\/td>\n<td>\u0110i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n tr\u1edf R2<\/td>\n<td>10k\u03a9<\/td>\n<td>\u0110i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1<\/td>\n<\/tr>\n<tr>\n<td>T\u1ee5 \u0111i\u1ec7n C1<\/td>\n<td>10nF<\/td>\n<td>\u0110i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 v\u1edbi vi \u0111i\u1ec1u khi\u1ec3n<\/h3>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng vi \u0111i\u1ec1u khi\u1ec3n cho ph\u00e9p t\u1ea1o ra m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 t\u00ednh linh ho\u1ea1t cao h\u01a1n.  B\u1ea1n c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh vi \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 t\u1ea1o ra c\u00e1c d\u1ea1ng s\u00f3ng kh\u00e1c nhau nh\u01b0 s\u00f3ng sin, s\u00f3ng vu\u00f4ng, s\u00f3ng tam gi\u00e1c, v\u00e0 \u0111i\u1ec1u ch\u1ec9nh t\u1ea7n s\u1ed1 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c th\u00f4ng qua ph\u1ea7n m\u1ec1m.  M\u1ed9t s\u1ed1 vi \u0111i\u1ec1u khi\u1ec3n ph\u1ed5 bi\u1ebfn nh\u01b0 Arduino Uno, ESP32, STM32 \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n<h3>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 tinh th\u1ec3<\/h3>\n<p>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 tinh th\u1ec3 s\u1eed d\u1ee5ng tinh th\u1ec3 th\u1ea1ch anh \u0111\u1ec3 t\u1ea1o ra t\u1ea7n s\u1ed1 \u1ed5n \u0111\u1ecbnh v\u00e0 ch\u00ednh x\u00e1c.  Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao nh\u01b0 \u0111\u1ed3ng h\u1ed3, thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng.<\/p>\n<h3>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 s\u00f3ng si\u00eau \u00e2m<\/h3>\n<p>\u0110\u1ed1i v\u1edbi vi\u1ec7c t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m, c\u1ea7n s\u1eed d\u1ee5ng c\u00e1c b\u1ed9 chuy\u1ec3n \u0111\u1ed5i \u0111\u1eb7c bi\u1ec7t.  T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng si\u00eau \u00e2m th\u01b0\u1eddng n\u1eb1m ngo\u00e0i ng\u01b0\u1ee1ng nghe c\u1ee7a con ng\u01b0\u1eddi. N\u1ebfu c\u1ea7n thi\u1ebft ph\u1ea3i \u0111\u1ec1 c\u1eadp, Beijing Ultrasonic l\u00e0 m\u1ed9t trong nh\u1eefng nh\u00e0 s\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb si\u00eau \u00e2m. Tuy nhi\u00ean, vi\u1ec7c t\u1ef1 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 si\u00eau \u00e2m \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c chuy\u00ean s\u00e2u v\u00e0 thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng.  N\u00ean c\u00e2n nh\u1eafc mua c\u00e1c b\u1ed9 ph\u00e1t si\u00eau \u00e2m c\u00f3 s\u1eb5n tr\u00ean th\u1ecb tr\u01b0\u1eddng n\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 \u0111\u1ee7 kinh nghi\u1ec7m.<\/p>\n<h3>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 v\u1edbi ph\u1ea7n m\u1ec1m<\/h3>\n<p>Hi\u1ec7n nay, c\u00f3 nhi\u1ec1u ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 t\u1ea1o ra t\u00edn hi\u1ec7u v\u1edbi t\u1ea7n s\u1ed1 mong mu\u1ed1n th\u00f4ng qua card \u00e2m thanh c\u1ee7a m\u00e1y t\u00ednh.  \u0110\u00e2y l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p nhanh ch\u00f3ng v\u00e0 ti\u1ec7n l\u1ee3i cho nh\u1eefng \u1ee9ng d\u1ee5ng kh\u00f4ng \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/p>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 ph\u1ee5 thu\u1ed9c v\u00e0o nhu c\u1ea7u v\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a b\u1ea1n. T\u1eeb nh\u1eefng m\u1ea1ch \u0111i\u1ec7n \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn nh\u1eefng thi\u1ebft k\u1ebf ph\u1ee9c t\u1ea1p, vi\u1ec7c hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng v\u00e0 l\u1ef1a ch\u1ecdn linh ki\u1ec7n ph\u00f9 h\u1ee3p s\u1ebd gi\u00fap b\u1ea1n t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 hi\u1ec7u qu\u1ea3.  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 h\u00e0nh tr\u00ecnh kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi \u0111i\u1ec7n t\u1eed th\u00fa v\u1ecb.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u1ec7c t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1, d\u00f9 \u0111\u01a1n gi\u1ea3n hay ph\u1ee9c t\u1ea1p, \u0111\u1ec1u \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 theo nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau,<\/p>\n","protected":false},"author":1,"featured_media":24652,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-45292","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\/45292","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=45292"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/45292\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/24652"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=45292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=45292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=45292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}