{"id":856,"date":"2013-01-05T11:14:23","date_gmt":"2013-01-05T16:14:23","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=856"},"modified":"2024-06-29T15:26:01","modified_gmt":"2024-06-29T20:26:01","slug":"cgs-serge-wave-multipliers","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/cgs-serge-wave-multipliers\/","title":{"rendered":"CGS Serge Wave Multipliers"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-waves.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"859\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-wave-multipliers\/cgs-serge-waves\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-waves.jpg?fit=500%2C581&amp;ssl=1\" data-orig-size=\"500,581\" 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-waves\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-waves.jpg?fit=500%2C581&amp;ssl=1\" class=\"alignleft size-full wp-image-859\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-waves.jpg?resize=500%2C581&#038;ssl=1\" alt=\"cgs-serge-waves\" width=\"500\" height=\"581\"\/><\/a>The CGS Serge Wave Multipliers is the fourth and final module in my CGS Serge banana jack panel.&nbsp; Please read <a title=\"Serge Wave Multipliers\" href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs113_vcm.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Ken Stone&#8217;s CGS 113 notes<\/a>.<\/p>\n<p>The board contains three independent timber modifier circuits that function to add harmonic content to an audio signal, the opposite approach to filtering, which selectively removes harmonic content.<\/p>\n<p>Each has a panel pot for the initial setting, plus a non-attenuated CV input.&nbsp; If you build this module, the addition of CV attenuator pots would be quite useful.<\/p>\n<p>The first multiplier is an non-standard VCA.&nbsp; It can operate in two modes, Lo or Hi, as selected by a toggle switch.&nbsp; In the Lo mode it works much like a regular VCA, except that it can amplify the input to at least twice the incoming level.&nbsp; There is also a bit of low pass filtering, a rounding of sharp edges.&nbsp; In the Hi mode the signal is squared up, but still with rounded edges.&nbsp; In Hi mode the gain is less than one.<\/p>\n<p>The second multiplier adds odd harmonics in a way that really benefits from sweeping the CV input.&nbsp; It has two signal inputs that mix.&nbsp; One is DC-coupled, the other AC-coupled and these are inverted in phase from each other.<\/p>\n<p>The third multiplier also has two inputs that mix together.&nbsp; And it has two different, simultaneously available outputs.&nbsp; This multiplier doubles the frequency of a sine or triangle wave at its input, and also benefits from sweeping the CV.&nbsp; The second output squares up the signal, resulting in a kind of pulse wave modulation.<\/p>\n<p><strong>Construction<\/strong><\/p>\n<p>This was built using the version 1.0 CGS 113 PC board.&nbsp; It required close attention to resistor values, comparing the board against the schematic.&nbsp; Some capacitors need to be <em>omitted<\/em> from the board.&nbsp; The resistor on trimpot TR2 should be a 1K5.&nbsp; At least three, and as many as eight capacitors need to be installed on the back of the board.&nbsp; I started out with the three capacitors that Ken Stone installed.&nbsp; After scoping the second multiplier and discovering parasitic oscillations, I added five more 47pf caps.&nbsp; Click the image for greater detail.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-back.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"857\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-wave-multipliers\/cgs-serge-wave-board-back\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-back.jpg?fit=1000%2C351&amp;ssl=1\" data-orig-size=\"1000,351\" 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-wave-board-back\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-back.jpg?fit=1000%2C351&amp;ssl=1\" class=\"aligncenter size-medium wp-image-857\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-back.jpg?resize=500%2C175&#038;ssl=1\" alt=\"cgs-serge-wave-board-back\" width=\"500\" height=\"175\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-back.jpg?resize=500%2C175&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-back.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a>Here is the top side of the board.&nbsp; I again used MTA-100 headers to connect to the panel, plus one flying connector.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-front.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"858\" data-permalink=\"https:\/\/pugix.com\/synth\/cgs-serge-wave-multipliers\/cgs-serge-wave-board-front\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-front.jpg?fit=1000%2C368&amp;ssl=1\" data-orig-size=\"1000,368\" 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-wave-board-front\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-front.jpg?fit=1000%2C368&amp;ssl=1\" class=\"aligncenter size-medium wp-image-858\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-front.jpg?resize=500%2C184&#038;ssl=1\" alt=\"cgs-serge-wave-board-front\" width=\"500\" height=\"184\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-front.jpg?resize=500%2C184&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2013\/01\/cgs-serge-wave-board-front.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a>I made a little demo recording of it processing a triangle wave of a VCO being stepped in a random fashion.&nbsp; It starts out showing the first multiplier in Hi mode.&nbsp; Then the second multiplier, followed by the third, and then I mixed all three together.&nbsp; It ends with the first multiplier again.&nbsp; I played with the initial pots and varied the CV levels, using an external attenuator.&nbsp;&nbsp; A Serge Negative Slew is used as an envelope generator for the CV inputs.<\/p>\n<p>&nbsp;<\/p>\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"  http:\/\/pugix.com\/synth\/wp-content\/uploads\/serge-waves-demo.mp3 \"><\/audio><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The CGS Serge Wave Multipliers is the fourth and final module in my CGS Serge banana jack panel.&nbsp; Please read Ken Stone&#8217;s CGS 113 notes. The board contains three independent &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/cgs-serge-wave-multipliers\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":859,"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":[134,71,132,60],"class_list":["post-856","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cgs","tag-cgs-serge","tag-diy","tag-serge","tag-wave-multiplier"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CGS Serge Wave Multipliers - 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-wave-multipliers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CGS Serge Wave Multipliers - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"The CGS Serge Wave Multipliers is the fourth and final module in my CGS Serge banana jack panel.&nbsp; Please read Ken Stone&#8217;s CGS 113 notes. 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