{"id":1961,"date":"2016-08-07T14:15:19","date_gmt":"2016-08-07T19:15:19","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=1961"},"modified":"2023-09-27T10:56:59","modified_gmt":"2023-09-27T15:56:59","slug":"zlob-dual-vca","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/zlob-dual-vca\/","title":{"rendered":"Zlob Dual VCA"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1963\" data-permalink=\"https:\/\/pugix.com\/synth\/zlob-dual-vca\/zlob-dual-vca-perspective\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?fit=1000%2C358&amp;ssl=1\" data-orig-size=\"1000,358\" 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=\"zlob-dual-vca-perspective\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?fit=1000%2C358&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1963\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=500%2C179&#038;ssl=1\" alt=\"zlob-dual-vca-perspective\" width=\"500\" height=\"179\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=500%2C179&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=768%2C275&amp;ssl=1 768w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=220%2C79&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=250%2C90&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=355%2C127&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=730%2C261&amp;ssl=1 730w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?resize=90%2C32&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-perspective.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>I had 2 HP of space left in my Synthrotek portable Eurorack case, after shuffling some modules.&nbsp;&nbsp; Looking around for 2 HP modules, I found this little gem, from <a href=\"https:\/\/zlobmodular.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Zlob modular<\/a>.&nbsp; Here&#8217;s the description of it on <a href=\"https:\/\/www.modulargrid.net\/e\/zlob-dual-vca\" target=\"_blank\" rel=\"noopener noreferrer\">Modular Grid<\/a>.<\/p>\n<p>I was going to order an assembled module, but <a href=\"http:\/\/www.ctrl-mod.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Control<\/a> only had the DIY kit in stock, so I got that.&nbsp; And I&#8217;m glad I did, because I was able to make a few modifications.<\/p>\n<ul>\n<li>Upgraded the 5% resistors to 1% from my resistor stock.<\/li>\n<li>Upgraded the IC sockets to machined-pin type.<\/li>\n<li>Replaced the diode reverse power protection with 0.1 uf bypass capacitors.<\/li>\n<li>Hardwired each output into the Sum, instead of having each removed when patching the channel output jack.<\/li>\n<\/ul>\n<p>The machined-pin sockets raised the profile just a tad, but only up to the level of the trim pots.&nbsp; As for the reversed power protection diodes, I don&#8217;t need them, and I wanted to add more bypass capacitance, since there are only three 10 nf caps per rail.&nbsp;&nbsp; The biggest mod was removing the jack switching, where if one of the channel outputs is patched, that channel is removed from the Sum output.&nbsp; I could not see a point in that, since there are only two channels.&nbsp; With the original design, if you patch both channel outputs, there will be nothing on the Sum output.&nbsp; The white wires show the jumpers that hardwire, so that both channels are always present in the Sum output, no matter how the outputs are patched.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1964\" data-permalink=\"https:\/\/pugix.com\/synth\/zlob-dual-vca\/zlob-dual-vca-top\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?fit=1000%2C526&amp;ssl=1\" data-orig-size=\"1000,526\" 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=\"zlob-dual-vca-top\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?fit=1000%2C526&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1964\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=500%2C263&#038;ssl=1\" alt=\"zlob-dual-vca-top\" width=\"500\" height=\"263\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=500%2C263&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=768%2C404&amp;ssl=1 768w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=220%2C116&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=250%2C132&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=355%2C187&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=730%2C384&amp;ssl=1 730w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-top.jpg?resize=90%2C47&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-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\/2016\/08\/zlob-dual-vca-bottom.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1962\" data-permalink=\"https:\/\/pugix.com\/synth\/zlob-dual-vca\/zlob-dual-vca-bottom\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?fit=1000%2C556&amp;ssl=1\" data-orig-size=\"1000,556\" 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=\"zlob-dual-vca-bottom\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?fit=1000%2C556&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1962\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=500%2C278&#038;ssl=1\" alt=\"zlob-dual-vca-bottom\" width=\"500\" height=\"278\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=500%2C278&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=768%2C427&amp;ssl=1 768w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=220%2C122&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=250%2C139&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=355%2C197&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=730%2C406&amp;ssl=1 730w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?resize=90%2C50&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2016\/08\/zlob-dual-vca-bottom.jpg?w=1000&amp;ssl=1 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>All the jacks plus the two LEDs mount on one PC board, with the rest on the main board that attaches by right angle headers.&nbsp; I omitted the two header pins that brought back the switched output signals to the summing op amp, since I jumpered those on the board.<\/p>\n<p>The panel is atypical for Euro, being made out of Laser Cut Acrylic.&nbsp; It&#8217;s flexible.&nbsp; Looks a bit bent in the pictures, too, but this wasn&#8217;t a problem.&nbsp; It&#8217;s also thick.&nbsp; I shaved off some of the material behind the panel from the jack holes, so that the barrels would protrude farther and the nuts could find more purchase.<\/p>\n<p>No instructions came with this kit, nor was I able to find any on the Zlob website.&nbsp; No matter.&nbsp; I started by drawing out the schematic (which I won&#8217;t share, since they don&#8217;t give it).&nbsp; All the supplied parts matched the PC board, except for the two resistors that set the brightness for the red and green LEDs (which just monitor the CV inputs).&nbsp; The PC board gave 1K2 for the green and 1K1 for the red, but the resistors supplied were 1K and 3K3.&nbsp; I guessed wrong and put the 3K3 on the green LED.&nbsp; It was not very bright, and the red one was too bright!&nbsp; So I swapped in 1K8 for each to see, and the red was still too bright.&nbsp; So I set that to 3K3 and it&#8217;s still brighter than the green, but okay.<\/p>\n<h4>Sensitivity<\/h4>\n<p>I discovered that unity gain occurs with about 2.5 volts on the CV input.&nbsp; So with a typical 5 volt control signal, the gain is times two.&nbsp; I don&#8217;t mind having an amplifying VCA.&nbsp; And I have a Mutable Instruments Shades triple attenuator right next to this VCA, if I want to control the CV amplitude going in.<\/p>\n<h4>Setup<\/h4>\n<p>Each channel has a trimpot to set the zero point, which I set just a tad below zero, so that the channel cuts off completely with zero volts of CV.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I had 2 HP of space left in my Synthrotek portable Eurorack case, after shuffling some modules.&nbsp;&nbsp; Looking around for 2 HP modules, I found this little gem, from Zlob &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/zlob-dual-vca\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":1963,"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":[161,118],"tags":[71,21],"class_list":["post-1961","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","category-sold-modules","tag-diy","tag-vca"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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