{"id":48892,"date":"2023-04-21T22:54:18","date_gmt":"2023-04-22T03:54:18","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-make-a-signal-generator\/"},"modified":"2025-01-21T07:17:23","modified_gmt":"2025-01-21T12:17:23","slug":"how-to-make-a-signal-generator","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-make-a-signal-generator\/","title":{"rendered":"T\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u: H\u01b0\u1edbng d\u1eabn chi ti\u1ebft"},"content":{"rendered":"<p>Vi\u1ec7c t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u, 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 m\u1ea1ch \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c linh ki\u1ec7n. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u \u0111\u01a1n gi\u1ea3n, t\u1eeb nh\u1eefng linh ki\u1ec7n d\u1ec5 ki\u1ebfm, ph\u00f9 h\u1ee3p cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u t\u00ecm hi\u1ec3u v\u1ec1 \u0111i\u1ec7n t\u1eed.<\/p>\n<h3>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u<\/h3>\n<p>M\u00e1y ph\u00e1t t\u00edn hi\u1ec7u ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean vi\u1ec7c t\u1ea1o ra c\u00e1c dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eed c\u00f3 t\u1ea7n s\u1ed1 v\u00e0 bi\u00ean \u0111\u1ed9 x\u00e1c \u0111\u1ecbnh. C\u00e1c dao \u0111\u1ed9ng n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, v\u00ed d\u1ee5 nh\u01b0 s\u1eed d\u1ee5ng m\u1ea1ch dao \u0111\u1ed9ng LC, m\u1ea1ch dao \u0111\u1ed9ng \u0111a h\u00e0i, ho\u1eb7c s\u1eed d\u1ee5ng vi \u0111i\u1ec1u khi\u1ec3n.<\/p>\n<h3>Ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u \u0111\u01a1n gi\u1ea3n s\u1eed d\u1ee5ng IC 555<\/h3>\n<p>IC 555 l\u00e0 m\u1ed9t linh ki\u1ec7n \u0111a n\u0103ng v\u00e0 d\u1ec5 s\u1eed d\u1ee5ng, r\u1ea5t ph\u00f9 h\u1ee3p \u0111\u1ec3 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u \u0111\u01a1n gi\u1ea3n.  M\u1ea1ch n\u00e0y c\u00f3 th\u1ec3 t\u1ea1o ra s\u00f3ng vu\u00f4ng v\u1edbi t\u1ea7n s\u1ed1 v\u00e0 chu k\u1ef3 thay \u0111\u1ed5i \u0111\u01b0\u1ee3c.<\/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<\/th>\n<th>M\u00f4 t\u1ea3<\/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><\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n tr\u1edf R2<\/td>\n<td>100k\u03a9<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>T\u1ee5 \u0111i\u1ec7n C1<\/td>\n<td>0.1\u00b5F<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Ngu\u1ed3n \u0111i\u1ec7n<\/td>\n<td>5V &#8211; 15V<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>C\u00e1ch th\u1ee9c l\u1eafp r\u00e1p: K\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n theo s\u01a1 \u0111\u1ed3 m\u1ea1ch c\u1ee7a IC 555 astable multivibrator (c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u00ecm th\u1ea5y tr\u00ean internet). \u0110i\u1ec1u ch\u1ec9nh gi\u00e1 tr\u1ecb c\u1ee7a R1, R2 v\u00e0 C1 \u0111\u1ec3 thay \u0111\u1ed5i t\u1ea7n s\u1ed1 v\u00e0 chu k\u1ef3 c\u1ee7a s\u00f3ng vu\u00f4ng.<\/p>\n<h3>Ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u s\u1eed d\u1ee5ng 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 c\u00e1c d\u1ea1ng s\u00f3ng ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c t\u1ea7n s\u1ed1, bi\u00ean \u0111\u1ed9 v\u00e0 d\u1ea1ng s\u00f3ng. Tuy nhi\u00ean, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c l\u1eadp tr\u00ecnh.<\/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<\/th>\n<th>M\u00f4 t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Vi \u0111i\u1ec1u khi\u1ec3n (v\u00ed d\u1ee5: Arduino Uno)<\/td>\n<td>1<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n tr\u1edf<\/td>\n<td>Kh\u00e1c nhau t\u00f9y m\u1ea1ch<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>T\u1ee5 \u0111i\u1ec7n<\/td>\n<td>Kh\u00e1c nhau t\u00f9y m\u1ea1ch<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>Ngu\u1ed3n \u0111i\u1ec7n<\/td>\n<td>T\u00f9y thu\u1ed9c vi \u0111i\u1ec1u khi\u1ec3n<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>C\u00e1ch th\u1ee9c l\u1eafp r\u00e1p: L\u1eadp tr\u00ecnh vi \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 t\u1ea1o ra t\u00edn hi\u1ec7u mong mu\u1ed1n. K\u1ebft n\u1ed1i c\u00e1c linh ki\u1ec7n ngo\u1ea1i vi c\u1ea7n thi\u1ebft (nh\u01b0 DAC) \u0111\u1ec3 xu\u1ea5t t\u00edn hi\u1ec7u ra.<\/p>\n<h3>Ki\u1ec3m tra v\u00e0 hi\u1ec7u ch\u1ec9nh<\/h3>\n<p>Sau khi l\u1eafp r\u00e1p, c\u1ea7n ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u b\u1eb1ng oscilloscope ho\u1eb7c c\u00e1c thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng kh\u00e1c.  \u0110i\u1ec1u ch\u1ec9nh c\u00e1c linh ki\u1ec7n \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ea7n s\u1ed1 v\u00e0 d\u1ea1ng s\u00f3ng mong mu\u1ed1n.<\/p>\n<p>Vi\u1ec7c ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u, t\u1eeb \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn ph\u1ee9c t\u1ea1p, l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh h\u1ecdc h\u1ecfi th\u00fa v\u1ecb v\u00e0 h\u1eefu \u00edch. 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 l\u0129nh v\u1ef1c \u0111i\u1ec7n t\u1eed.  B\u1eb1ng vi\u1ec7c th\u1ef1c h\u00e0nh v\u00e0 t\u00ecm hi\u1ec3u th\u00eam, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ebf t\u1ea1o nh\u1eefng m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u ph\u1ee9c t\u1ea1p h\u01a1n, \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c nhi\u1ec1u nhu c\u1ea7u kh\u00e1c nhau.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u1ec7c t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u, 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 m\u1ea1ch \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c linh ki\u1ec7n. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch ch\u1ebf t\u1ea1o m\u1ed9t m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u \u0111\u01a1n gi\u1ea3n, t\u1eeb nh\u1eefng linh ki\u1ec7n d\u1ec5<\/p>\n","protected":false},"author":1,"featured_media":4852,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-48892","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\/48892","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=48892"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/48892\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/4852"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=48892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=48892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=48892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}