{"id":842,"date":"2012-12-16T17:00:02","date_gmt":"2012-12-16T22:00:02","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=842"},"modified":"2020-02-16T15:38:13","modified_gmt":"2020-02-16T20:38:13","slug":"cgs-serge-dual-universal-slope-generator","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/cgs-serge-dual-universal-slope-generator\/","title":{"rendered":"CGS Serge Dual Universal Slope Generator"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-usg.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"837\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-dc-mixer\/cgs-serge-usg\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-usg.jpg?fit=300%2C466&amp;ssl=1\" data-orig-size=\"300,466\" 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;}\" data-image-title=\"cgs-serge-usg\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-usg.jpg?fit=300%2C466&amp;ssl=1\" class=\"alignleft size-full wp-image-837\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-usg.jpg?resize=300%2C466&#038;ssl=1\" alt=\"cgs-serge-usg\" width=\"300\" height=\"466\"\/><\/a>The Serge Dual Universal Slope Generator may have achieved more renown than almost any other 1970&#8217;s era Serge module.&nbsp; Ken Stone of Catgirl Synth makes the PC board.&nbsp; See <a title=\"CGS DSUG\" href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs114_dusg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">CGS 114 DUSG<\/a>.<\/p>\n<p>Be sure to look at the <a title=\"CGS Serge VCS\" href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs75_vcs.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">CGS 75 Serge VCS <\/a>board as well.&nbsp; The circuits are fundamentally identical.&nbsp; The main difference is that the VCS is a single board and offers addition CV and trigger inputs and panel features.<\/p>\n<p>This module is incredibly versatile.&nbsp; It can perform as a<\/p>\n<ul>\n<li>VC transient (envelope) generator<\/li>\n<li>VC slewing (portamento)<\/li>\n<li>VCO and VC LFO<\/li>\n<li>VC low pass gate<\/li>\n<li>VC pulse delay<\/li>\n<li>VC pulse divider (subharmonic generator)<\/li>\n<\/ul>\n<p>It&#8217;s amazing how compact it is in the banana jack format!<\/p>\n<p><strong>Construction<\/strong><\/p>\n<p>I tested batches of 2N3904 and 2N3906 transistors to find gain-matched pairs, using the method described in Electronotes #39, p. 6.&nbsp; I also took particular care with resistor values, comparing with those used in my VCS circuits.&nbsp; The stated 470K pull-down for offsetting the Bipolar output should be closer to 600K.&nbsp; Note that the Bipolar output is also inverted from the normal Out.<\/p>\n<p>There is a place on the board, not shown on the schematic, for another output, which is called &#8220;AC Out&#8221; on the VCS.&nbsp; It puts a 47uf capacitor in series with the main out.&nbsp; I did not use it.&nbsp; Instead, I used the location of the capacitor to install a 1K series output resistor and take the normal Out from that, instead of the DCO output.&nbsp; Reason is that I found with the VCS if I shorted the output to ground while patching, it stops oscillating, because the internal feedback is coming right off that external output.<\/p>\n<p><strong>Mechanical Details<\/strong><\/p>\n<p>Since discovering MTA-100 connectors, I&#8217;ve started using them in preference to direct wiring, so that a board can be completely removed for repair.&nbsp; The DUSG board, however, doesn&#8217;t cooperate perfectly, emitting eight wires at random locations.&nbsp; So I used &#8216;flying&#8217; 3-pin connectors, Mouser 571-5-103946-2, and 571-5-103958-2.&nbsp; These mate in the air.&nbsp; The pins in these connectors are obviously meant for a specialized crimp tool, but I figured out how to solder #24 wires into them.&nbsp; A bit finicky, but not too hard.<\/p>\n<p>I tried 4-40 nylon mounting hardware for the first time.&nbsp; It works great!&nbsp; Mouser parts 534-4800 (1\/4&#8243; standoff),&nbsp; 534-4806 (1&#8243; standoff), 561-P440.25 (1\/4&#8243; screw), 561-G440 (hex nut).&nbsp; I wish I had used nylon before, it&#8217;s easy to work with and is non-conductive.<\/p>\n<p>Photo of the wiring (click for more detail):<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-dusg-wiring-1000px.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"838\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-dc-mixer\/cgs-serge-dusg-wiring-1000px\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-dusg-wiring-1000px.jpg?fit=1000%2C702&amp;ssl=1\" data-orig-size=\"1000,702\" 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;}\" data-image-title=\"cgs-serge-dusg-wiring-1000px\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-dusg-wiring-1000px.jpg?fit=1000%2C702&amp;ssl=1\" class=\"alignleft size-medium wp-image-838\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-dusg-wiring-1000px.jpg?resize=500%2C351&#038;ssl=1\" alt=\"cgs-serge-dusg-wiring-1000px\" width=\"500\" height=\"351\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-dusg-wiring-1000px.jpg?resize=500%2C351&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-dusg-wiring-1000px.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Serge Dual Universal Slope Generator may have achieved more renown than almost any other 1970&#8217;s era Serge module.&nbsp; Ken Stone of Catgirl Synth makes the PC board.&nbsp; See CGS &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/cgs-serge-dual-universal-slope-generator\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":837,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_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}},"categories":[6],"tags":[134,71,135,187],"class_list":["post-842","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cgs","tag-cgs-serge","tag-diy","tag-slew","tag-slew-limiter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CGS Serge Dual Universal Slope Generator - Richard Brewster&#039;s Electronic Sounds<\/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:\/\/pugix.com\/synth\/cgs-serge-dual-universal-slope-generator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CGS Serge Dual Universal Slope Generator - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"The Serge Dual Universal Slope Generator may have achieved more renown than almost any other 1970&#8217;s era Serge module.&nbsp; 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