{"id":848,"date":"2012-12-31T11:45:55","date_gmt":"2012-12-31T16:45:55","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=848"},"modified":"2020-02-16T15:37:31","modified_gmt":"2020-02-16T20:37:31","slug":"cgs-serge-ssg","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/","title":{"rendered":"CGS Serge SSG"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-panel-2.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"852\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/cgs-serge-ssg-panel-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-panel-2.jpg?fit=500%2C389&amp;ssl=1\" data-orig-size=\"500,389\" 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-ssg-panel-2\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-panel-2.jpg?fit=500%2C389&amp;ssl=1\" class=\"aligncenter size-full wp-image-852\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-panel-2.jpg?resize=500%2C389&#038;ssl=1\" alt=\"cgs-serge-ssg-panel-2\" width=\"500\" height=\"389\"\/><\/a><\/p>\n<p>This is my take on the legendary Serge Smooth and Stepped Generator (SSG).&nbsp; I received the SSG PC board as a compliment from Ken Stone, who designed the board.&nbsp; The circuit is of course by Serge Tcherepnin.&nbsp; Ken has an <a title=\"CGS SSG\" href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgsssg_ssg.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">excellent writeup<\/a> of the SSG.<\/p>\n<p>The banana jack color coding used on this panel is as follows:<\/p>\n<ul>\n<li>Yellow: signal input<\/li>\n<li>Blue: control voltage input<\/li>\n<li>Black: gate or trigger input<\/li>\n<li>Green: signal output<\/li>\n<li>Red: gate or trigger output.<\/li>\n<\/ul>\n<p>The SSG contains two almost identical voltage-controlled circuits that place a limit how fast the voltage can change on an incoming signal. The effect is a lag, that, when applied to a VCO pitch, will produce a portamento. That is just the beginning. Each slew has a Cycle output, which when patched to the input turns the module into a triangle wave VCO. There is also a Hold input, which takes a gate signal. When Hold is held high, the slew rate becomes so low as to stop the output from changing at all.<\/p>\n<p>The board also contains two &#8216;one-shot&#8217; generators that emit a short negative pulse when triggered at the input. The one-shot output normally sits high, around +15V. Patching it to a Hold input turns the Smooth function into a Stepped function, a type of sample and hold. The Serge panel did not provide the outputs of these one-shots, but internally jumpers one of them to the Hold input of one slew, thus making it into the Stepped generator. I put the inputs and outputs of both one-shots onto panel jacks, so I can have one or two Stepped Generators, by patching to Hold inputs. I added a 1K resistor in series with each one-shot output for current limiting.<\/p>\n<p>Below is a picture of a one-shot on a scope.&nbsp; The top trace is the input square wave that is triggering it.&nbsp; The bottom trace shows the output of a one-shot.&nbsp; Each positive transition of the input results in a negative-going pulse of a short duration (about 1 ms).&nbsp; This transition is from about +15 to about -15 volts.<\/p>\n<div id=\"attachment_3161\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3161\" data-attachment-id=\"3161\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/one-shot-scoped\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;2.2&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone 6&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1543661943&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.15&quot;,&quot;iso&quot;:&quot;250&quot;,&quot;shutter_speed&quot;:&quot;0.0666666666667&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"one-shot-scoped\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;One-shot on the scope&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?fit=640%2C480&amp;ssl=1\" class=\"size-medium wp-image-3161\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?resize=500%2C375&#038;ssl=1\" alt=\"\" width=\"500\" height=\"375\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?resize=90%2C68&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/one-shot-scoped.jpg?w=640&amp;ssl=1 640w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><p id=\"caption-attachment-3161\" class=\"wp-caption-text\">One-shot on the scope<\/p><\/div>\n<p>The last circuit on the SSG board is called the Coupler. It&#8217;s a comparator that, in the original design, looked at outputs of the two slews and put out a gate indicating that one is higher than the other. I decided to make this into a separate module on the panel, and I modified the circuit just a little. I disconnected the inputs from the slews on the PC board, added 100K terminating resistors on the inputs, replaced the small feedback capacitor with a 4M7 resistor for DC hysteresis, and brought the 0 to 6V output to the panel.<\/p>\n<p>I added a small board with three LED driver circuits, one for the Coupler and one for each of the Smooth generators. Here&#8217;s the board and its schematic, and also the new Coupler schematic.<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-led-driver.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"851\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/cgs-serge-ssg-led-driver\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-led-driver.jpg?fit=500%2C375&amp;ssl=1\" data-orig-size=\"500,375\" 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-ssg-led-driver\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-led-driver.jpg?fit=500%2C375&amp;ssl=1\" class=\"aligncenter size-full wp-image-851\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-led-driver.jpg?resize=500%2C375&#038;ssl=1\" alt=\"cgs-serge-ssg-led-driver\" width=\"500\" height=\"375\"\/><\/a><br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-mods-schematic.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"849\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/cgs-serge-mods-schematic\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-mods-schematic.jpg?fit=500%2C447&amp;ssl=1\" data-orig-size=\"500,447\" 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-mods-schematic\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-mods-schematic.jpg?fit=500%2C447&amp;ssl=1\" class=\"aligncenter size-full wp-image-849\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-mods-schematic.jpg?resize=500%2C447&#038;ssl=1\" alt=\"cgs-serge-mods-schematic\" width=\"500\" height=\"447\"\/><\/a><\/p>\n<p>The LED driver board is powered by a short cable coming over from the SSG board itself. As with the other CGS Serge boards in this panel, I used a combination of MTA 100 and flying wire connections to insure that the board can be completely removed from the panel without unsoldering. (Click this pic for more detail.)<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-wiring.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"853\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/cgs-serge-ssg-wiring\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-wiring.jpg?fit=1000%2C644&amp;ssl=1\" data-orig-size=\"1000,644\" 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-ssg-wiring\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-wiring.jpg?fit=1000%2C644&amp;ssl=1\" class=\"aligncenter size-medium wp-image-853\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-wiring.jpg?resize=500%2C322&#038;ssl=1\" alt=\"cgs-serge-ssg-wiring\" width=\"500\" height=\"322\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-wiring.jpg?resize=500%2C322&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-wiring.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>Here&#8217;s a more detailed photo of the board. I found some beautiful old dipped mylar capacitors to use for the timing caps. The 220nf one is pretty big.<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-board.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"850\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/cgs-serge-ssg-board\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-board.jpg?fit=1000%2C381&amp;ssl=1\" data-orig-size=\"1000,381\" 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-ssg-board\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-board.jpg?fit=1000%2C381&amp;ssl=1\" class=\"aligncenter size-medium wp-image-850\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-board.jpg?resize=500%2C190&#038;ssl=1\" alt=\"cgs-serge-ssg-board\" width=\"500\" height=\"190\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-board.jpg?resize=500%2C190&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2012\/12\/cgs-serge-ssg-board.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p><strong>Tune Up<\/strong><br \/>\nEach slew has a trimming pot that sets the initial slew rate. I somewhat arbitrarily set the faster slew (the one using the 100nf timing cap) to max out at about 1Khz when the knob is turned all the way up. I set the slower one for about 500Hz max. When oscillating, these circuits are not very stable. But they seem to settle down and stop wavering after a while.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is my take on the legendary Serge Smooth and Stepped Generator (SSG).&nbsp; I received the SSG PC board as a compliment from Ken Stone, who designed the board.&nbsp; The &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/cgs-serge-ssg\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":852,"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":[134,71,132,187],"class_list":["post-848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cgs","tag-cgs-serge","tag-diy","tag-serge","tag-slew-limiter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CGS Serge SSG - 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-ssg\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CGS Serge SSG - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"This is my take on the legendary Serge Smooth and Stepped Generator (SSG).&nbsp; I received the SSG PC board as a compliment from Ken Stone, who designed the board.&nbsp; The ... 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