{"id":632,"date":"2011-07-04T15:37:18","date_gmt":"2011-07-04T20:37:18","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=632"},"modified":"2020-02-08T16:40:44","modified_gmt":"2020-02-08T21:40:44","slug":"buchla-258j-vco","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/buchla-258j-vco\/","title":{"rendered":"Buchla 258J VCO"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-panel.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"633\" data-permalink=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/buchla-258j-panel\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-panel.jpg?fit=95%2C470&amp;ssl=1\" data-orig-size=\"95,470\" 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=\"buchla-258J-panel\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-panel.jpg?fit=95%2C470&amp;ssl=1\" class=\"alignleft size-full wp-image-633\" title=\"buchla-258J-panel\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-panel.jpg?resize=95%2C470&#038;ssl=1\" alt=\"\" width=\"95\" height=\"470\"\/><\/a>Quantity 2<\/p>\n<p>This is my build of the J3RK Buchla 258J VCO board, as discussed on Muff&#8217;s message board:<\/p>\n<p><a title=\"Buchlaish 258J VCO\" href=\"http:\/\/www.muffwiggler.com\/forum\/viewtopic.php?t=26856\" target=\"_blank\" rel=\"noopener noreferrer\">Board thread<\/a><\/p>\n<p><a title=\"258J build thread\" href=\"http:\/\/www.muffwiggler.com\/forum\/viewtopic.php?t=31038\" target=\"_blank\" rel=\"noopener noreferrer\">Build and mod thread<\/a><\/p>\n<p>I put it into my famous 1U 16-position MOTM grid panel.&nbsp; Here&#8217;s the Front Panel Express file.<\/p>\n<p><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258j-vco.fpd\">Buchla 258J VCO FPE panel<\/a><\/p>\n<p>This is a music VCO with 1V\/octave tracking over several octaves and a temperature compensated exponential voltage converter.&nbsp; I would say its most notable features are a voltage-controlled wave shape, and a very nice linear FM.&nbsp; The <a title=\"258J schematic\" href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/258mod.jpg\" target=\"_blank\" rel=\"noopener noreferrer\">schematic diagram <\/a>provided by Mark Verbos matches pretty closely to the PC board.<\/p>\n<h3>My build and modifications<\/h3>\n<ul>\n<li>The builder decides between mixing a square or sawtooth wave with the sine wave in the wave shaper.&nbsp; The choice can be made by a selection of resistors at build time or by adding a rather complicated switch.&nbsp; For simplicity I chose the sawtooth version.<\/li>\n<li>The PC board offers three outputs:&nbsp; the main wave shape output, a triangle and a square wave output.&nbsp; These outputs are roughly 5 volts peak-to-peak.&nbsp; I added a quad op amp to the board to buffer these outputs and also the sine wave output.&nbsp; The buffers have gain to bring the levels to a standard 10 volt p-p level.&nbsp; (I&#8217;ll add the buffer schematic later.)<\/li>\n<li>The PC board has frequency control voltage summing for a coarse tune pot, two 1V\/octave inputs, and one reversible CV input (which can easily be doubled to two inputs).&nbsp; My exponential CV inputs include a 1V\/octave input jack, one attenuated FM input, one reversible CV input, and also a fine tune pot for which I had to add a 4M7 resistor to the board.<\/li>\n<li>For the linear FM section I selected a 1uf polyester film capacitor with a 39K series resistor and a 50K audio taper attenuator pot.&nbsp; These values work well for me, giving a good depth of FM, and control over the lower levels of modulation.&nbsp; Low frequencies pass quite well, allowing for slow linear tremolo.<\/li>\n<li>I added some 100nf bypass caps to the underside of the board.<\/li>\n<li>As to the much debated choice for switching transistor (a rare 2N3638 is called out), I substituted a BC560C, which works fine.&nbsp; I always print out a data sheet when installing transistors to insure correct lead placement.&nbsp; The PC board marks E, B, C, for the transistor leads on the top of the board, which helps.<\/li>\n<li>I added a 100K linear pot to attenuate the wave shape CV in and left off the 150K resistor from the board.<\/li>\n<\/ul>\n<h3>First Impression<\/h3>\n<p>The initial frequency trim pot lets you set a bias point for the coarse range.&nbsp; At first I set the lowest frequency to 20 Hz.&nbsp; As this produced a high end of 35 KHz, I decided to set the high end to about 25 KHz and let the low end fall where it might, which turned out to be under 1 Hz!&nbsp; A very nice range.<\/p>\n<p>I was able to set the 1V\/octave tracking for at least three octaves of accuracy and perhaps more.<\/p>\n<p>Adjusting the wave shape trim pots, I had a surprise.&nbsp; The VC wave shape affects both the sine and the wave outputs!&nbsp; I was very glad that I brought out the sine wave (which is tapped from the drain of the J201 FET and buffered to bring up the level).&nbsp; Nicely, the sine output maintains a constant amplitude as it changes shape and becomes edgy.&nbsp; The wave shape output that mixes in a sawtooth increases in amplitude as it shifts from &#8216;sine-like&#8217; to &#8216;saw-like&#8217; in shape.&nbsp; The &#8216;sine-like&#8217; shape yields low harmonic content, but is not as smooth as the sine output.&nbsp; (I&#8217;ll post some demo recordings.)<\/p>\n<h3>Pictures<\/h3>\n<p>Board<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-board-top.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"637\" data-permalink=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/buchla-258j-board-top\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-board-top.jpg?fit=500%2C305&amp;ssl=1\" data-orig-size=\"500,305\" 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=\"buchla-258J-board-top\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-board-top.jpg?fit=500%2C305&amp;ssl=1\" class=\"aligncenter wp-image-637 size-full\" title=\"buchla-258J-board-top\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-board-top.jpg?resize=500%2C305&#038;ssl=1\" alt=\"\" width=\"500\" height=\"305\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-board-top.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-board-top.jpg?resize=300%2C183&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>Behind the panel<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-back.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"636\" data-permalink=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/buchla-258j-back\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-back.jpg?fit=500%2C309&amp;ssl=1\" data-orig-size=\"500,309\" 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=\"buchla-258J-back\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-back.jpg?fit=500%2C309&amp;ssl=1\" class=\"aligncenter wp-image-636 size-full\" title=\"buchla-258J-back\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-back.jpg?resize=500%2C309&#038;ssl=1\" alt=\"\" width=\"500\" height=\"309\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-back.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-back.jpg?resize=300%2C185&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>Buffer wiring on the underside of the board<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-muck-detail.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"638\" data-permalink=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/buchla-258j-muck-detail\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-muck-detail.jpg?fit=500%2C422&amp;ssl=1\" data-orig-size=\"500,422\" 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=\"buchla-258J-muck-detail\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-muck-detail.jpg?fit=500%2C422&amp;ssl=1\" class=\"aligncenter wp-image-638 size-full\" title=\"buchla-258J-muck-detail\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-muck-detail.jpg?resize=500%2C422&#038;ssl=1\" alt=\"\" width=\"500\" height=\"422\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-muck-detail.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-muck-detail.jpg?resize=300%2C253&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><br \/>\nHere&#8217;s an image of an output buffer schematic.&nbsp; My buffers are essentially the same as the shaded portion in the upper right.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/output-buffers.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1144\" data-permalink=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/output-buffers\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/output-buffers.png?fit=800%2C668&amp;ssl=1\" data-orig-size=\"800,668\" 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=\"output-buffers\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/output-buffers.png?fit=800%2C668&amp;ssl=1\" class=\"aligncenter size-medium wp-image-1144\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/output-buffers.png?resize=500%2C417&#038;ssl=1\" alt=\"output-buffers\" width=\"500\" height=\"417\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/output-buffers.png?resize=500%2C417&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/output-buffers.png?w=800&amp;ssl=1 800w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>The bracket that I made from thin aluminum stock from Lowes, shown before bending.<br \/>\n<a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-bracket.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"639\" data-permalink=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/buchla-258j-bracket\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-bracket.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=\"buchla-258J-bracket\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-bracket.jpg?fit=500%2C375&amp;ssl=1\" class=\"aligncenter wp-image-639 size-full\" title=\"buchla-258J-bracket\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-bracket.jpg?resize=500%2C375&#038;ssl=1\" alt=\"\" width=\"500\" height=\"375\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-bracket.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/07\/buchla-258J-bracket.jpg?resize=300%2C225&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quantity 2 This is my build of the J3RK Buchla 258J VCO board, as discussed on Muff&#8217;s message board: Board thread Build and mod thread I put it into my &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/buchla-258j-vco\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":636,"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":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[10],"tags":[114,22],"class_list":["post-632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other","tag-buchla","tag-vco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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