{"id":60,"date":"2017-10-30T11:53:15","date_gmt":"2017-10-30T11:53:15","guid":{"rendered":"http:\/\/jagumiel.xyz\/blog\/?p=60"},"modified":"2025-02-28T11:27:01","modified_gmt":"2025-02-28T11:27:01","slug":"comprobar-transistores-jfet","status":"publish","type":"post","link":"https:\/\/jagumiel.xyz\/blog\/2017\/10\/30\/comprobar-transistores-jfet\/","title":{"rendered":"Comprobar transistores JFET: Gu\u00eda pr\u00e1ctica"},"content":{"rendered":"<h2>Introducci\u00f3n<\/h2>\n<p>En esta entrada os voy a ense\u00f1ar c\u00f3mo comprobar transistores JFET, para encontrar parejas similares. Para algunos proyectos electr\u00f3nicos en los que se usan varios transistores JFET es necesario que tengan unas caracter\u00edsticas lo m\u00e1s parecidas posibles. En el caso de estos componentes, al comprarlos es probable que su comportamiento var\u00ede un poco entre s\u00ed. Para algunas aplicaciones, como por ejemplo el audio, esto es un problema, ya que, si queremos hacer un amplificador en est\u00e9reo, las salidas van a estar descompensadas. Un ejemplo de las curvas que queremos obtener es este:<\/p>\n<div id=\"attachment_27\" style=\"width: 525px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/curvas.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-27\" class=\"alignnone size-full wp-image-62\" src=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/curvas.png\" alt=\"\" width=\"515\" height=\"440\" srcset=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/curvas.png 515w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/curvas-300x256.png 300w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/curvas-150x128.png 150w\" sizes=\"auto, (max-width: 515px) 100vw, 515px\" \/><\/a><p id=\"caption-attachment-27\" class=\"wp-caption-text\">Imagen 1. Gr\u00e1fico de la curva caracter\u00edstica de un transistor JFET.<\/p><\/div>\n<h2>Circuito y componentes<\/h2>\n<p>En este proyecto se pretende poder analizar de una forma r\u00e1pida un transistor, de forma que obtengamos su curva al aplicar diferentes voltajes en la entrada del circuito y en la puerta o \u201cgate\u201d del transistor. En el circuito se puede reemplazar el transistor para probar otros diferentes y observar si sus curvas coinciden o no. El esquema es el siguiente:<\/p>\n<div id=\"attachment_27\" style=\"width: 469px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/Circuito_Acq.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-27\" class=\"alignnone size-full wp-image-61\" src=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/Circuito_Acq.png\" alt=\"\" width=\"459\" height=\"242\" srcset=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/Circuito_Acq.png 459w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/Circuito_Acq-300x158.png 300w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/Circuito_Acq-150x79.png 150w\" sizes=\"auto, (max-width: 459px) 100vw, 459px\" \/><\/a><p id=\"caption-attachment-27\" class=\"wp-caption-text\">Imagen 2. Diagrama del circuito para la comprobaci\u00f3n del transistor.<\/p><\/div>\n<p>El circuito de la imagen anterior contiene un amplificador operacional que es alimentado con 12V de una fuente externa. A trav\u00e9s de una tarjeta de adquisici\u00f3n obtenemos la se\u00f1al de 5V, y adem\u00e1s generamos el voltaje de entrada (Vin) y el voltaje puerta-fuente (Vgs). Estas tensiones se regulan a trav\u00e9s de MATLAB, que se comunica con la tarjeta de adquisici\u00f3n.<br \/>\nPor otro lado, tenemos tambi\u00e9n que recoger datos, los puntos interesantes se encuentran entre la resistencia R5 y el drenador del transistor Q1, y entre la fuente y el drenador de Q1. Para ello se utilizar\u00e1n las entradas diferenciales de la tarjeta de adquisici\u00f3n. El montaje del circuito se puede ver en la siguiente imagen:<\/p>\n<div id=\"attachment_27\" style=\"width: 1290px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-27\" class=\"alignnone size-full wp-image-66\" src=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279.jpg\" alt=\"\" width=\"1280\" height=\"960\" srcset=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279.jpg 1280w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279-300x225.jpg 300w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279-768x576.jpg 768w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279-1024x768.jpg 1024w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279-150x113.jpg 150w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/a><p id=\"caption-attachment-27\" class=\"wp-caption-text\">Imagen 3. Montaje del circuito de pruebas.<\/p><\/div>\n<h2>Resultados obtenidos<\/h2>\n<p>Los datos son recogidos y representados gr\u00e1ficamente con la herramienta MATLAB. Los resultados son los siguientes:<\/p>\n<div id=\"attachment_27\" style=\"width: 1291px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-27\" class=\"alignnone size-full wp-image-63\" src=\"http:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4.png\" alt=\"\" width=\"1281\" height=\"908\" srcset=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4.png 1281w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4-300x213.png 300w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4-768x544.png 768w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4-1024x726.png 1024w, https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4-150x106.png 150w\" sizes=\"auto, (max-width: 1281px) 100vw, 1281px\" \/><\/a><p id=\"caption-attachment-27\" class=\"wp-caption-text\">Imagen 4. Resultados tras la prueba de tres transistores MPF102.<\/p><\/div>\n<p>Se puede ver en esta \u00faltima imagen c\u00f3mo despu\u00e9s de probar tres transistores diferentes hay tres curvas que no coinciden. Si probaramos m\u00e1s, muy probablemente, consigui\u00e9ramos encontrar un transistor que se solape casi perfectamente con la curva de otro de los anteriores. De este modo, obtendr\u00edamos una pareja, y se podr\u00eda utilizar en el mismo circuito. En la siguiente entrada, seguiremos trabajando con MATLAB, en este caso, para hacer un <a title=\"Volt\u00edmetro Gr\u00e1fico\" href=\"https:\/\/jagumiel.xyz\/blog\/2017\/11\/03\/voltimetro-grafico\/\" target=\"_blank\" rel=\"noopener\">volt\u00edmetro gr\u00e1fico<\/a>.<\/p>\n<p>En los siguientes enlaces se puede acceder al c\u00f3digo o al repositorio completo de adquisici\u00f3n de datos:<\/p>\n<p><a href=\"https:\/\/github.com\/jagumiel\/Data-Acquisition\">Repositorio de adquisici\u00f3n de datos<\/a><br \/>\n<a href=\"https:\/\/github.com\/jagumiel\/Data-Acquisition\/blob\/master\/Matlab\/Transistor_Cmp\/Transistor_Cmp.m\">C\u00f3digo del comparador de transistores<\/a><\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 25%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-60 gallery-columns-4 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/jagumiel.xyz\/blog\/2017\/10\/30\/comprobar-transistores-jfet\/curvas\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/curvas-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/jagumiel.xyz\/blog\/2017\/10\/30\/comprobar-transistores-jfet\/circuito_acq\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/Circuito_Acq-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/jagumiel.xyz\/blog\/2017\/10\/30\/comprobar-transistores-jfet\/photo6035358456489290279\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/photo6035358456489290279-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/jagumiel.xyz\/blog\/2017\/10\/30\/comprobar-transistores-jfet\/toma4\/'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/jagumiel.xyz\/blog\/wp-content\/uploads\/2017\/10\/toma4-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Comprobar transistores JFET\" aria-describedby=\"gallery-1-63\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-63'>\n\t\t\t\tUna forma de comprobar transistores JFET. Resultado.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Aprende a comprobar transistores JFET de forma sencilla y r\u00e1pida con esta gu\u00eda. Descubre los m\u00e9todos m\u00e1s efectivos para testear su funcionamiento.<\/p>\n<p class=\"continue-reading-button\"> <a class=\"continue-reading-link\" href=\"https:\/\/jagumiel.xyz\/blog\/2017\/10\/30\/comprobar-transistores-jfet\/\">Continue reading<i class=\"crycon-right-dir\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":63,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[7,5,6],"tags":[14,38,39],"class_list":["post-60","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adquisicion-de-datos","category-hardware","category-sieav","tag-hardware","tag-matlab","tag-transistores"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Aprende a comprobar transistores JFET de forma sencilla y r\u00e1pida con esta gu\u00eda. 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