{"id":4564,"date":"2021-11-20T14:04:34","date_gmt":"2021-11-20T19:04:34","guid":{"rendered":"https:\/\/pugix.com\/synth\/?p=4564"},"modified":"2023-02-15T13:33:54","modified_gmt":"2023-02-15T18:33:54","slug":"four-c-l-vca","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/four-c-l-vca\/","title":{"rendered":"Four C-L VCA"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"4565\" data-permalink=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/four-vca-top-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1637410519&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;25&quot;,&quot;shutter_speed&quot;:&quot;0.0067567567567568&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"four-vca-top-1\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-4565\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-1.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p>A few posts back I described an <a href=\"https:\/\/pugix.com\/synth\/experimental-vca-for-ciat-lonbarde\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">experimental VCA<\/a>, based on the AVDog circuit by Peter Blasser in the Plumbutter. Our friend crucFx (Josh Rodriquez) offered to make a PC board containing four of these circuits.  And here it is:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"408\" data-attachment-id=\"4566\" data-permalink=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/four-vca-board\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?fit=640%2C408&amp;ssl=1\" data-orig-size=\"640,408\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1637077580&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;32&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"four-vca-board\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?fit=640%2C408&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?resize=640%2C408&#038;ssl=1\" alt=\"\" class=\"wp-image-4566\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?resize=500%2C319&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?resize=220%2C140&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?resize=250%2C159&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?resize=355%2C226&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-board.jpeg?resize=90%2C57&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Assembled board<\/figcaption><\/figure>\n\n\n\n<p>Here&#8217;s the crucFx PDF download schematic.  <\/p>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file aligncenter\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/CL-VCA-PUGIX.pdf\" type=\"application\/pdf\" style=\"width:100%;height:100%\" aria-label=\"Embed of Embed of CL-VCA-PUGIX..\"><\/object><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/CL-VCA-PUGIX.pdf\">CL-VCA-PUGIX<\/a><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/CL-VCA-PUGIX.pdf\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Mido-Centered<\/h3>\n\n\n\n<p>As I explained in the former post, many of Peter Blasser&#8217;s circuit designs use a single 9 volt power supply (which allows them to be battery powered, too) with a middle (mido) voltage set at 4.5 volts, about which signals swing.  The typical peak-to-peak signal voltage is also about 4.5 volts.  When used as control voltage, voltages below +4.5V act inversely from those above the mido point.  My VCA circuit is adapted from one published by Peter B., as a part of his AVDog module.  It expects the incoming signal and control voltages to be mido-centered and the output is also mido-centered.  Having DC-coupling lets slow LFOs pass through and be multiplied.  The main use I envision is for controlling signal levels, and also for Amplitude Modulation.  Whenever an output signal needs coupling to an external zero-volt-based bipolar input, AC-coupling is helpful.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"618\" data-attachment-id=\"4571\" data-permalink=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/four-vca-partial-assm\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?fit=640%2C618&amp;ssl=1\" data-orig-size=\"640,618\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1637322884&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;40&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"four-vca-partial-assm\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?fit=640%2C618&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?resize=640%2C618&#038;ssl=1\" alt=\"\" class=\"wp-image-4571\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?resize=500%2C483&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?resize=220%2C212&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?resize=250%2C241&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?resize=355%2C343&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-partial-assm.jpeg?resize=90%2C87&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Partially wired<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"395\" data-attachment-id=\"4572\" data-permalink=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/four-vca-front\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?fit=640%2C395&amp;ssl=1\" data-orig-size=\"640,395\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1637410448&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;25&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"four-vca-front\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?fit=640%2C395&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?resize=640%2C395&#038;ssl=1\" alt=\"\" class=\"wp-image-4572\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?resize=500%2C309&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?resize=220%2C136&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?resize=250%2C154&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?resize=355%2C219&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-front.jpeg?resize=90%2C56&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">View showing power inlet glued in place to the plexiglass panel<\/figcaption><\/figure>\n\n\n\n<p>Green jacks are the signal inputs, orange the signal outputs, and violet the CV inputs.  Black jack is a zero-volt connection.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"480\" height=\"640\" data-attachment-id=\"4573\" data-permalink=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/four-vca-top-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?fit=480%2C640&amp;ssl=1\" data-orig-size=\"480,640\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1637410625&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;32&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"four-vca-top-2\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?fit=480%2C640&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?resize=480%2C640&#038;ssl=1\" alt=\"\" class=\"wp-image-4573\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?w=480&amp;ssl=1 480w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?resize=220%2C293&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?resize=250%2C333&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?resize=355%2C473&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-top-2.jpeg?resize=90%2C120&amp;ssl=1 90w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><figcaption class=\"wp-element-caption\">Top view<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" data-attachment-id=\"4574\" data-permalink=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/four-vca-credits\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?fit=640%2C480&amp;ssl=1\" data-orig-size=\"640,480\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;iPhone XR&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1637410639&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.25&quot;,&quot;iso&quot;:&quot;64&quot;,&quot;shutter_speed&quot;:&quot;0.0083333333333333&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"four-vca-credits\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?fit=640%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?resize=640%2C480&#038;ssl=1\" alt=\"\" class=\"wp-image-4574\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?w=640&amp;ssl=1 640w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?resize=500%2C375&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?resize=220%2C165&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?resize=250%2C188&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?resize=355%2C266&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2021\/11\/four-vca-credits.jpeg?resize=90%2C68&amp;ssl=1 90w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Credits on the PC board<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>A few posts back I described an experimental VCA, based on the AVDog circuit by Peter Blasser in the Plumbutter. Our friend crucFx (Josh Rodriquez) offered to make a PC &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/four-c-l-vca\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":4574,"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":[209],"tags":[122,71,21],"class_list":["post-4564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mido-diy","tag-ciat-lonbarde","tag-diy","tag-vca"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Four C-L VCA - 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\/four-c-l-vca\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Four C-L VCA - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"A few posts back I described an experimental VCA, based on the AVDog circuit by Peter Blasser in the Plumbutter. 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