{"id":1283,"date":"2014-11-30T12:07:17","date_gmt":"2014-11-30T17:07:17","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=1283"},"modified":"2023-01-19T08:54:19","modified_gmt":"2023-01-19T13:54:19","slug":"stereo-input-module","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/stereo-input-module\/","title":{"rendered":"Stereo Input Module"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-front-panel.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1288\" data-permalink=\"https:\/\/pugix.com\/synth\/stereo-input-module\/stereo-input-front-panel\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-front-panel.jpg?fit=110%2C526&amp;ssl=1\" data-orig-size=\"110,526\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"stereo-input-front-panel\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-front-panel.jpg?fit=110%2C526&amp;ssl=1\" class=\"alignleft size-medium wp-image-1288\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-front-panel.jpg?resize=110%2C526&#038;ssl=1\" alt=\"stereo-input-front-panel\" width=\"110\" height=\"526\"\/><\/a>Sometimes you cannot find a PC board with just the right circuit.&nbsp; This was one of those times.&nbsp; I work with a lot of stereo sources, such as the Ciat-Lonbarde instruments, that output line level audio.&nbsp; I needed a way to bring those into the modular at full levels, so I designed a circuit and built it myself.&nbsp; It features<\/p>\n<ul>\n<li>Stereo input mini-jack<\/li>\n<li>Quarter inch left and right inputs<\/li>\n<li>Left and right outputs<\/li>\n<li>Mono mixed output<\/li>\n<li>Clip indicator LEDS<\/li>\n<li>Master gain knob<\/li>\n<\/ul>\n<div style=\"clear: left;\">\n<p><strong>The Circuit<\/strong><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-schematic.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1289\" data-permalink=\"https:\/\/pugix.com\/synth\/stereo-input-module\/stereo-input-schematic\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-schematic.jpg?fit=1000%2C829&amp;ssl=1\" data-orig-size=\"1000,829\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"stereo-input-schematic\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-schematic.jpg?fit=1000%2C829&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1289\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-schematic.jpg?resize=500%2C414&#038;ssl=1\" alt=\"stereo-input-schematic\" width=\"500\" height=\"414\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-schematic.jpg?resize=500%2C414&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-schematic.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a>The mini-jack inputs go through the normal switching on the quarter-inch jacks so that either can be used, but not both simultaneously.&nbsp; Each channel has a unity gain buffer with AC coupling and a 470K terminating resistor.&nbsp; This is followed by an inverting buffer with 20X gain max.&nbsp; A dual-ganged audio taper pot allows the gain to be adjusted from zero up to 20X.&nbsp; The panel dial is marked to correspond roughly to the gain.&nbsp; At the lower settings, a full synthesizer level input can be processed.&nbsp; It&#8217;s not a mistake that the last two markings both indicate 20X.&nbsp; This is due to the fact that the maximum resistance of the pot is reached a bit before the maximum rotation.<\/p>\n<p>Each channel is monitored by a comparator that lights an LED whenever the signal passes 4 volts peak to peak.&nbsp; An inverting unity gain mixer provides a handy mono output.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-top.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1287\" data-permalink=\"https:\/\/pugix.com\/synth\/stereo-input-module\/stereo-input-board-top\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-top.jpg?fit=1000%2C803&amp;ssl=1\" data-orig-size=\"1000,803\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"stereo-input-board-top\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-top.jpg?fit=1000%2C803&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1287\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-top.jpg?resize=500%2C401&#038;ssl=1\" alt=\"stereo-input-board-top\" width=\"500\" height=\"401\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-top.jpg?resize=500%2C401&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-top.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-bottom.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1286\" data-permalink=\"https:\/\/pugix.com\/synth\/stereo-input-module\/stereo-input-board-bottom\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-bottom.jpg?fit=1000%2C829&amp;ssl=1\" data-orig-size=\"1000,829\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"stereo-input-board-bottom\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-bottom.jpg?fit=1000%2C829&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1286\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-bottom.jpg?resize=500%2C414&#038;ssl=1\" alt=\"stereo-input-board-bottom\" width=\"500\" height=\"414\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-bottom.jpg?resize=500%2C414&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-board-bottom.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-back.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1284\" data-permalink=\"https:\/\/pugix.com\/synth\/stereo-input-module\/stereo-input-assembled-back\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-back.jpg?fit=1000%2C750&amp;ssl=1\" data-orig-size=\"1000,750\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"stereo-input-assembled-back\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-back.jpg?fit=1000%2C750&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1284\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-back.jpg?resize=500%2C375&#038;ssl=1\" alt=\"stereo-input-assembled-back\" width=\"500\" height=\"375\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-back.jpg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-back.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-board.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1285\" data-permalink=\"https:\/\/pugix.com\/synth\/stereo-input-module\/stereo-input-assembled-board\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-board.jpg?fit=1000%2C750&amp;ssl=1\" data-orig-size=\"1000,750\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"stereo-input-assembled-board\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-board.jpg?fit=1000%2C750&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1285\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-board.jpg?resize=500%2C375&#038;ssl=1\" alt=\"stereo-input-assembled-board\" width=\"500\" height=\"375\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-board.jpg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2014\/11\/stereo-input-assembled-board.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sometimes you cannot find a PC board with just the right circuit.&nbsp; This was one of those times.&nbsp; I work with a lot of stereo sources, such as the Ciat-Lonbarde &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/stereo-input-module\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":1288,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[208],"tags":[71,202],"class_list":["post-1283","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-designed-by-richard-brewster","tag-diy","tag-input"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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