{"id":615,"date":"2011-02-26T15:51:45","date_gmt":"2011-02-26T20:51:45","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=615"},"modified":"2024-06-29T14:40:46","modified_gmt":"2024-06-29T19:40:46","slug":"dual-xr2206-vco","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/dual-xr2206-vco\/","title":{"rendered":"Dual XR2206 VCO"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-panel.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"616\" data-permalink=\"https:\/\/pugix.com\/synth\/dual-xr2206-vco\/xr2206-vco-panel\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-panel.jpg?fit=95%2C463&amp;ssl=1\" data-orig-size=\"95,463\" 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=\"xr2206-vco-panel\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-panel.jpg?fit=95%2C463&amp;ssl=1\" class=\"alignleft size-full wp-image-616\" title=\"xr2206-vco-panel\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-panel.jpg?resize=95%2C463&#038;ssl=1\" alt=\"\" width=\"95\" height=\"463\"\/><\/a>Quantity:&nbsp; 1 Dual VCO<\/p>\n<p>This is a circuit of my own, based on the XR-2206 VCO data sheet examples.&nbsp; Features:<\/p>\n<ul>\n<li>Coarse and fine frequency controls<\/li>\n<li>Low\/High range switch<\/li>\n<li>Sine\/Triangle switched output<\/li>\n<li>Square wave output<\/li>\n<li>Linear, AC-coupled FM input<\/li>\n<li>Internally normalized for cross modulation<\/li>\n<\/ul>\n<p>My intended use of these VCOs is as modulation sources for linear FM of other VCOs, such as the Cynthia ZerOscillator and the Fritz Teezer.&nbsp; I was looking for a sine wave VCO for quite a while, but a 1U sine wave VCO in MOTM format is not commonly found.&nbsp; I happened across the XR-2206 in a discussion on Muff Wiggler&#8217;s forum and found this hobby store that sells a PC board.<\/p>\n<p><a title=\"XR2206 VCO\" href=\"http:\/\/electronics-diy.com\/Function_Generator_XR2206.php\" target=\"_blank\" rel=\"noopener noreferrer\">Electronics DIY XR-2206 PC Board<\/a><\/p>\n<p>Realizing that I did not need 1V\/octave tracking or other high-quality music VCO features, I bought two boards and two XR-2206 chips.&nbsp; (Get the XR-2206 from Mouser for under $5.00 each).<\/p>\n<p>After I got the chips I started breadboarding.&nbsp; Although I used the PC boards, I didn&#8217;t follow the original circuit but built my own.&nbsp; I added an FM input, set a fixed amplitude for the sine\/triangle output, and selected capacitors for the low and high ranges.&nbsp; The XR-2206 is powered between ground and +15V, so the output is all above ground.&nbsp; The triangle is much larger than the sine wave.&nbsp; So I designed a buffer circuit, using a TL072 on a Tellun MUUB-2 PC board to provide +\/-5V sine and triangle waves, and a +\/-5V square wave obtained with the comparator circuit that I often use.<\/p>\n<p>Here is the <a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr-2206-vco.fpd\">Dual XR-2206 Front Panel Express Panel<\/a>.<\/p>\n<p>Here is the <a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr-2206-board.pdf\">XR-2206 Circuit Diagram<\/a>, and the <a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr-2206-buffer.pdf\">Buffer Circuit Diagram<\/a>.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-back.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"619\" data-permalink=\"https:\/\/pugix.com\/synth\/dual-xr2206-vco\/xr2206-vco-back\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-back.jpg?fit=500%2C472&amp;ssl=1\" data-orig-size=\"500,472\" 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=\"xr2206-vco-back\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-back.jpg?fit=500%2C472&amp;ssl=1\" class=\"aligncenter size-full wp-image-619\" title=\"xr2206-vco-back\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-back.jpg?resize=500%2C472&#038;ssl=1\" alt=\"\" width=\"500\" height=\"472\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-back.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2011\/02\/xr2206-vco-back.jpg?resize=300%2C283&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>There is a trimpot on the XR-2206 board for the sine shape, and trimpots on the MUUB board for the sine and triangle levels.&nbsp; The sine\/triangle switch is DPDT.&nbsp; One side switches the wave selection and the other switches between trimpots on the MUUB, so that the output levels of the sine and triangle can be made the same.&nbsp; The FM input is AC-coupled by necessity, because the initial frequency is set by the combined resistance of the two frequency pots from pin 7 of the XR-2207 to ground.&nbsp; DC-coupling would be tricky to do, but not necessary in this application.<\/p>\n<p>The sine\/triangle output of each VCO is connected behind the panel to the switching lug of the other VCO&#8217;s FM input to facilitate cross-modulation without need for patch cords or multiples.<\/p>\n<p>Here&#8217;s a demo recording of the module.&nbsp; It starts out showing the two frequency ranges of one oscillator, using the sine wave. &nbsp; (The low range is 8 Hz to 400 Hz, the high range 87 Hz to 4300 Hz.)&nbsp; Then the second VCO is brought in.&nbsp; The second then modulates the first, then the first the second, and then each other simultaneously.&nbsp; Then both are switched to triangle and knobs are twiddled a bit.<\/p>\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"  http:\/\/pugix.com\/synth\/wp-content\/uploads\/xr2206-vcos-selfmod.mp3 \"><\/audio><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Quantity:&nbsp; 1 Dual VCO This is a circuit of my own, based on the XR-2206 VCO data sheet examples.&nbsp; Features: Coarse and fine frequency controls Low\/High range switch Sine\/Triangle switched &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/dual-xr2206-vco\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":619,"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":[208],"tags":[71,22],"class_list":["post-615","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-designed-by-richard-brewster","tag-diy","tag-vco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dual XR2206 VCO - 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\/dual-xr2206-vco\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dual XR2206 VCO - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"Quantity:&nbsp; 1 Dual VCO This is a circuit of my own, based on the XR-2206 VCO data sheet examples.&nbsp; Features: Coarse and fine frequency controls Low\/High range switch Sine\/Triangle switched ... 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