{"id":1074,"date":"2023-04-05T11:45:03","date_gmt":"2023-04-05T10:45:03","guid":{"rendered":"http:\/\/amir-shahabi.com\/m1\/?p=1074"},"modified":"2023-03-15T12:30:26","modified_gmt":"2023-03-15T12:30:26","slug":"lp-convertor","status":"publish","type":"post","link":"https:\/\/amir-shahabi.com\/m\/en\/lp-convertor\/","title":{"rendered":"LP Convertor"},"content":{"rendered":"<p><section class=\"kc-elm kc-css-10312 kc_row\"><div class=\"kc-row-container  kc-container\"><div class=\"kc-wrap-columns\"><div class=\"kc-elm kc-css-176305 kc_col-sm-12 kc_column kc_col-sm-12\"><div class=\"kc-col-container\"><div class=\"kc-elm kc-css-198222 kc_text_block\"><\/p>\n<p>To listen old vinyl LP\u2019s in a correct sounding on a sassy with dynamic cartridge you need a circuit, I named it vinyl convertor. You can find this circuit in old amps, but it isn\u2019t embedded in home cinema equipment or amplifiers can be obtained nowadays. Also, if you want to archive your vinyl LP\u2019s in your computer it is necessary to use this convertor. It is good, if this corrector has a little built-in amplifier to drive small control speakers, or earphones. Schematic of circuit built for this express purpose has two parts, convertor and amplifier.<\/p>\n<p>The convertor contains NE5532 integrated circuit with extreme small noise. Resistors are 1% metal film 0,6W types, condensers of this corrector section should be 5%, 63 \u2013 100 V types. Convertor section has direct output to external amp or computer. Amplifier section contains integrated amp IC LM1877. It delivers to speaker 2W\/channel output power with very low distortion. Potentiometer P1 is for control the output power of the amp section.<\/p>\n<p>The whole circuit works from external 12-16 V DC supply. LP\u2019s are engraved with reduced bass levels and increased treble levels. For the same sound level, a low frequency requires a larger groove which gives two drawbacks:<\/p>\n<p>&#8211; Less recording time<br \/>\u2013 Difficulties for the cartridge to follow it and thus, higher distortion<\/p>\n<p>At the other end of the spectrum, the contact between the stylus and the groove makes noise, a high frequency noise. By increasing the high frequencies level during recording we can obtain a better signal\/noise ratio as the noise is reduced by the playback curve.<\/p>\n<p>\n<\/div><\/div><\/div><\/div><\/div><\/section><section class=\"kc-elm kc-css-583577 kc_row\"><div class=\"kc-row-container  kc-container\"><div class=\"kc-wrap-columns\"><div class=\"kc-elm kc-css-201772 kc_col-sm-6 kc_column kc_col-sm-6\"><div class=\"kc-col-container\"><div class=\"kc-elm kc-css-118501 kc_text_block\"><\/p>\n<p>Here is the formula to obtain the optimum curve:<\/p>\n<p>\n<\/div><div class=\"kc-elm kc-css-931855 kc_shortcode kc_single_image\">\n\n        <img decoding=\"async\" src=\"https:\/\/amir-shahabi.com\/m\/wp-content\/uploads\/2023\/03\/2-1.gif\" class=\"\" alt=\"Single Image\" \/>    <\/div>\n<\/div><\/div><div class=\"kc-elm kc-css-740275 kc_col-sm-6 kc_column kc_col-sm-6\"><div class=\"kc-col-container\"><div class=\"kc-elm kc-css-641481 kc_text_block\"><\/p>\n<p>Where:<\/p>\n<p>N=level in dB<br \/>f=frequency<br \/>t1=treble time constant, 75uS<br \/>t2=medium time constant, 318uS<br \/>t3=bass time constant, 3180uS<\/p>\n<p>\n<\/div><\/div><\/div><\/div><\/div><\/section><section class=\"kc-elm kc-css-202162 kc_row\"><div class=\"kc-row-container  kc-container\"><div class=\"kc-wrap-columns\"><div class=\"kc-elm kc-css-651203 kc_col-sm-12 kc_column kc_col-sm-12\"><div class=\"kc-col-container\"><div class=\"kc-elm kc-css-81176 kc_shortcode kc_single_image\">\n\n        <a class=\"imagebox\" href=\"https:\/\/amir-shahabi.com\/m\/wp-content\/uploads\/2023\/03\/2-2.gif\" title=\"\" target=\"\">\n    \t<span class=\"thumbs-wrap\">\n        \t<img decoding=\"async\" src=\"https:\/\/amir-shahabi.com\/m\/wp-content\/uploads\/2023\/03\/2-2-1024x704.gif\" class=\"\" alt=\"Single Image\" \/>\n        \t\n        <\/span>\n\n\n            <\/a>\n    <\/div>\n<\/div><\/div><\/div><\/div><\/section><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1074","post","type-post","status-publish","format-standard","hentry","category-electronic"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.0 (Yoast SEO v20.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LP Convertor - Amir Shahabi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/amir-shahabi.com\/m\/en\/lp-convertor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LP Convertor - Amir Shahabi\" \/>\n<meta property=\"og:description\" content=\"To listen old vinyl LP\u2019s in a correct sounding on a sassy with dynamic cartridge you need a circuit, I named it vinyl convertor. 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