{"id":52564,"date":"2023-04-21T12:43:22","date_gmt":"2023-04-21T17:43:22","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/diy-frequency-generator\/"},"modified":"2025-01-21T07:07:48","modified_gmt":"2025-01-21T12:07:48","slug":"diy-frequency-generator","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/diy-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\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 (DIY frequency generator) \u0111\u00e3 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n bao gi\u1edd h\u1ebft nh\u1edd s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed d\u1ec5 ti\u1ebfp c\u1eadn v\u00e0 ngu\u1ed3n th\u00f4ng tin phong ph\u00fa tr\u00ean internet.  T\u1eeb vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 \u0111\u1ed9ng c\u01a1 \u0111\u1ebfn t\u1ea1o s\u00f3ng \u00e2m thanh cho c\u00e1c d\u1ef1 \u00e1n \u0111i\u1ec7n t\u1eed, m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 t\u1ef1 ch\u1ebf mang \u0111\u1ebfn gi\u1ea3i ph\u00e1p linh ho\u1ea1t v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n qua c\u00e1c kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ed9t m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 DIY, t\u1eeb l\u1ef1a ch\u1ecdn linh ki\u1ec7n \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf.<\/p>\n<h3>Nguy\u00ean L\u00fd Ho\u1ea1t \u0110\u1ed9ng<\/h3>\n<p>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd t\u1ea1o ra t\u00edn hi\u1ec7u dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eed v\u1edbi t\u1ea7n s\u1ed1 mong mu\u1ed1n.  T\u1ea7n s\u1ed1 n\u00e0y \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi c\u00e1c th\u00e0nh ph\u1ea7n trong m\u1ea1ch \u0111i\u1ec7n, ch\u1ee7 y\u1ebfu l\u00e0 \u0111i\u1ec7n tr\u1edf, t\u1ee5 \u0111i\u1ec7n v\u00e0 cu\u1ed9n c\u1ea3m.  C\u00e1c m\u1ea1ch dao \u0111\u1ed9ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m m\u1ea1ch \u0111a h\u00e0i, m\u1ea1ch dao \u0111\u1ed9ng LC v\u00e0 m\u1ea1ch s\u1eed d\u1ee5ng vi \u0111i\u1ec1u khi\u1ec3n.<\/p>\n<h3>L\u1ef1a Ch\u1ecdn Linh Ki\u1ec7n<\/h3>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn linh ki\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o d\u1ea3i t\u1ea7n s\u1ed1 v\u00e0 c\u00f4ng su\u1ea5t \u0111\u1ea7u ra mong mu\u1ed1n.  \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea7n s\u1ed1 th\u1ea5p, m\u1ea1ch RC \u0111\u01a1n gi\u1ea3n c\u00f3 th\u1ec3 \u0111\u1ee7.  Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi t\u1ea7n s\u1ed1 cao h\u01a1n, m\u1ea1ch LC ho\u1eb7c vi \u0111i\u1ec1u khi\u1ec3n l\u00e0 c\u1ea7n thi\u1ebft.<\/p>\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<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110i\u1ec7n tr\u1edf<\/td>\n<td>Kh\u00e1ng tr\u1edf d\u00f2ng \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>T\u1ee5 \u0111i\u1ec7n<\/td>\n<td>L\u01b0u tr\u1eef n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>Cu\u1ed9n c\u1ea3m<\/td>\n<td>L\u01b0u tr\u1eef n\u0103ng l\u01b0\u1ee3ng t\u1eeb<\/td>\n<\/tr>\n<tr>\n<td>Vi \u0111i\u1ec1u khi\u1ec3n<\/td>\n<td>B\u1ed9 n\u00e3o c\u1ee7a m\u1ea1ch, \u0111i\u1ec1u khi\u1ec3n t\u1ea7n s\u1ed1<\/td>\n<\/tr>\n<tr>\n<td>IC 555<\/td>\n<td>IC \u0111a n\u0103ng, th\u01b0\u1eddng d\u00f9ng trong m\u1ea1ch \u0111a h\u00e0i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>X\u00e2y D\u1ef1ng M\u1ea1ch \u0110i\u1ec7n<\/h3>\n<p>M\u1ea1ch \u0111i\u1ec7n c\u1ea7n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf c\u1ea9n th\u1eadn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a t\u1ea7n s\u1ed1.  S\u1eed d\u1ee5ng breadboard \u0111\u1ec3 th\u1eed nghi\u1ec7m m\u1ea1ch tr\u01b0\u1edbc khi h\u00e0n l\u00ean m\u1ea1ch in l\u00e0 m\u1ed9t b\u01b0\u1edbc quan tr\u1ecdng.  C\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn vi\u1ec7c b\u1ed1 tr\u00ed linh ki\u1ec7n \u0111\u1ec3 gi\u1ea3m thi\u1ec3u nhi\u1ec5u v\u00e0 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh.<\/p>\n<h3>\u0110i\u1ec1u Ch\u1ec9nh T\u1ea7n S\u1ed1<\/h3>\n<p>T\u1ea7n s\u1ed1 c\u1ee7a m\u00e1y ph\u00e1t 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.  \u0110\u1ed1i v\u1edbi m\u1ea1ch s\u1eed d\u1ee5ng vi \u0111i\u1ec1u khi\u1ec3n, t\u1ea7n s\u1ed1 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1eb1ng ph\u1ea7n m\u1ec1m.  Vi\u1ec7c hi\u1ec7u ch\u1ec9nh t\u1ea7n s\u1ed1 c\u1ea7n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n c\u1ea9n th\u1eadn b\u1eb1ng c\u00e1c d\u1ee5ng c\u1ee5 \u0111o l\u01b0\u1eddng nh\u01b0 m\u00e1y hi\u1ec7n s\u00f3ng.<\/p>\n<h3>\u1ee8ng D\u1ee5ng Th\u1ef1c T\u1ebf<\/h3>\n<p>M\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 DIY c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c, t\u1eeb \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 \u0111\u1ed9ng c\u01a1, t\u1ea1o s\u00f3ng \u00e2m thanh, \u0111\u1ebfn ki\u1ec3m tra c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed.  V\u00ed d\u1ee5, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 \u0111\u1ec3 t\u1ea1o s\u00f3ng si\u00eau \u00e2m cho c\u00e1c \u1ee9ng d\u1ee5ng l\u00e0m s\u1ea1ch.  N\u1ebfu c\u1ea7n t\u1ea1o s\u00f3ng si\u00eau \u00e2m v\u1edbi t\u1ea7n s\u1ed1 v\u00e0 c\u00f4ng su\u1ea5t c\u1ee5 th\u1ec3, v\u00e0 n\u1ebfu vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn th\u01b0\u01a1ng hi\u1ec7u l\u00e0 c\u1ea7n thi\u1ebft, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c s\u1ea3n ph\u1ea9m c\u1ee7a Beijing Ultrasonic \u0111\u1ec3 so s\u00e1nh v\u00e0 l\u1ef1a ch\u1ecdn. Tuy nhi\u00ean, vi\u1ec7c t\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 th\u01b0\u1eddng t\u1eadp trung v\u00e0o c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01a1n gi\u1ea3n h\u01a1n.<\/p>\n<h3>Kh\u1eafc Ph\u1ee5c S\u1ef1 C\u1ed1<\/h3>\n<p>M\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 th\u01b0\u1eddng g\u1eb7p bao g\u1ed3m t\u1ea7n s\u1ed1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh, c\u00f4ng su\u1ea5t \u0111\u1ea7u ra y\u1ebfu v\u00e0 nhi\u1ec5u. Ki\u1ec3m tra k\u1ef9 c\u00e1c k\u1ebft n\u1ed1i, gi\u00e1 tr\u1ecb linh ki\u1ec7n v\u00e0 b\u1ed1 tr\u00ed m\u1ea1ch l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1.<\/p>\n<p>T\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 l\u00e0 m\u1ed9t d\u1ef1 \u00e1n th\u00fa v\u1ecb v\u00e0 h\u1eefu \u00edch cho nh\u1eefng ng\u01b0\u1eddi y\u00eau th\u00edch \u0111i\u1ec7n t\u1eed.  B\u1eb1ng vi\u1ec7c hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, l\u1ef1a ch\u1ecdn linh ki\u1ec7n ph\u00f9 h\u1ee3p v\u00e0 thi\u1ebft k\u1ebf m\u1ea1ch c\u1ea9n th\u1eadn, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a m\u00ecnh.  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 \u0111\u1ea7y th\u00fa v\u1ecb n\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u1ec7c t\u1ef1 ch\u1ebf m\u00e1y ph\u00e1t t\u1ea7n s\u1ed1 (DIY frequency generator) \u0111\u00e3 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n bao gi\u1edd h\u1ebft nh\u1edd s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed d\u1ec5 ti\u1ebfp c\u1eadn v\u00e0 ngu\u1ed3n th\u00f4ng tin phong ph\u00fa tr\u00ean internet. T\u1eeb vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 \u0111\u1ed9ng c\u01a1 \u0111\u1ebfn t\u1ea1o s\u00f3ng \u00e2m thanh cho c\u00e1c<\/p>\n","protected":false},"author":1,"featured_media":19348,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-52564","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\/52564","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=52564"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/52564\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19348"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=52564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=52564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=52564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}