{"id":2922,"date":"2018-08-15T17:39:53","date_gmt":"2018-08-15T22:39:53","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=2922"},"modified":"2018-08-15T17:39:53","modified_gmt":"2018-08-15T22:39:53","slug":"dannysound-en129-thru-zero-oscillator","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/dannysound-en129-thru-zero-oscillator\/","title":{"rendered":"Dannysound EN129 Thru-Zero Oscillator"},"content":{"rendered":"<p>The <a href=\"https:\/\/www.thonk.co.uk\/shop\/dannysound-thru-zero-kit\/\" target=\"_blank\" rel=\"noopener\">Dannysound EN129 Thru-Zero Oscillator<\/a> is one of a pair of DIY only oscillator kits from Thonk.\u00a0 See my post about the <a href=\"http:\/\/pugix.com\/synth\/dannysound-california-oscillator\/\" target=\"_blank\" rel=\"noopener\">Cali Osc<\/a>, too.<\/p>\n<div id=\"attachment_2927\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2927\" data-attachment-id=\"2927\" data-permalink=\"https:\/\/pugix.com\/synth\/dannysound-en129-thru-zero-oscillator\/en129_osc-perspective\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?fit=600%2C941&amp;ssl=1\" data-orig-size=\"600,941\" 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=\"en129_osc-perspective\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;My build of the EN129 VCO&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?fit=600%2C941&amp;ssl=1\" class=\"wp-image-2927 size-medium\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?resize=500%2C784&#038;ssl=1\" alt=\"\" width=\"500\" height=\"784\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?resize=500%2C784&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?resize=220%2C345&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?resize=250%2C392&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?resize=355%2C557&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?resize=90%2C141&amp;ssl=1 90w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-perspective.jpg?w=600&amp;ssl=1 600w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><p id=\"caption-attachment-2927\" class=\"wp-caption-text\">My build of the EN129 VCO<\/p><\/div>\n<p>The EN129 Oscillator is based on the through-zero VCO by Bernie Hutchins, published in <a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129.pdf\">Electronotes #129<\/a>.\u00a0 This is an analog through-zero oscillator with a full set of waveforms, including sine, triangle, sawtooth, pulse and square.\u00a0 Features also include:<\/p>\n<ul>\n<li>Coarse and fine tune knobs, driven by internal 9 volt regulators<\/li>\n<li>Linear through-zero frequency modulation input with attenuator<\/li>\n<li>Log (i.e. exponential) FM input with attenuator<\/li>\n<li>Pulse Width Modulation (PWM)<\/li>\n<li>Symmetrized Ramp Modulation (SRM)<\/li>\n<li>Panel LEDs monitoring incoming control voltages, pre-attenuation<\/li>\n<\/ul>\n<p>This VCO does not include an onboard VCA for dynamic depth linear FM, as did the original EN129, but it&#8217;s easy enough to use an external VCA.<\/p>\n<h3>Construction<\/h3>\n<p>The physical design is identical to the Cali Oscillator.\u00a0 The build guide again gives almost too much detail in the placement of parts, showing a photo for each value of resistor, etc..\u00a0 Parts are separated into bags, each bag having a label with the part number from the schematic.\u00a0 It would be pretty hard to get a part in the wrong place.\u00a0 I didn&#8217;t follow the build order exactly, since I like to solder as many parts in place with Kester 331 solder with water washable flux.\u00a0 As with the Cali Osc, I used heat shrink and thermal compound on the matched PNP transistor pair.\u00a0 And I encountered the same 1 mm flexing issue with the panel that I described in detail on that other post.\u00a0 Something I didn&#8217;t mention before was the use of light pipes in the panel in front of the LEDs.\u00a0 I&#8217;ve never encountered that approach before.\u00a0 You have to insure that each LED is aligned behind its light pipe, which is a bit of a pain.\u00a0 I would solder one leg while using the other as a lever to position it.\u00a0 You can notice some no-clean flux on the panel board, left from soldering the pots, jacks, switch and LEDs.<\/p>\n<div id=\"attachment_2925\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2925\" data-attachment-id=\"2925\" data-permalink=\"https:\/\/pugix.com\/synth\/dannysound-en129-thru-zero-oscillator\/en129_osc-panel-board\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?fit=600%2C1061&amp;ssl=1\" data-orig-size=\"600,1061\" 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=\"en129_osc-panel-board\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Panel board back&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?fit=579%2C1024&amp;ssl=1\" class=\"size-full wp-image-2925\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=600%2C1061&#038;ssl=1\" alt=\"\" width=\"600\" height=\"1061\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?w=600&amp;ssl=1 600w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=500%2C884&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=579%2C1024&amp;ssl=1 579w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=220%2C389&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=250%2C442&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=355%2C628&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-panel-board.jpg?resize=90%2C159&amp;ssl=1 90w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-2925\" class=\"wp-caption-text\">Panel board back<\/p><\/div>\n<div id=\"attachment_2924\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2924\" data-attachment-id=\"2924\" data-permalink=\"https:\/\/pugix.com\/synth\/dannysound-en129-thru-zero-oscillator\/en129_osc-main-board\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?fit=600%2C1061&amp;ssl=1\" data-orig-size=\"600,1061\" 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=\"en129_osc-main-board\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Main board&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?fit=579%2C1024&amp;ssl=1\" class=\"size-full wp-image-2924\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=600%2C1061&#038;ssl=1\" alt=\"\" width=\"600\" height=\"1061\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?w=600&amp;ssl=1 600w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=500%2C884&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=579%2C1024&amp;ssl=1 579w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=220%2C389&amp;ssl=1 220w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=250%2C442&amp;ssl=1 250w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=355%2C628&amp;ssl=1 355w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/en129_osc-main-board.jpg?resize=90%2C159&amp;ssl=1 90w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-2924\" class=\"wp-caption-text\">Main board<\/p><\/div>\n<p>A few things to point out on the Main board.\u00a0 Notice the 1n polystyrene capacitor is a radial lead type.\u00a0 It&#8217;s supposed to be axial, so it can lie down.\u00a0 The radial leads make it stand up.<\/p>\n<p>I substituted CA3080s from my own stock of Harris Semiconductor parts.\u00a0 These have worked well in past projects, so I trust them.\u00a0 (I used a Harris in the Cali Osc too.)\u00a0 Also I happened to have some LF353 op amps, which is the original part used by Bernie Hutchins for U6 (he used two LF351s), and which is shown as that on the schematic provided by Thonk.\u00a0 The TL072 provided is an equivalent, but I wanted to use the LF353 anyway.\u00a0 I&#8217;m sure I can&#8217;t tell any difference.<\/p>\n<h3>Tested Frequency Ranges<\/h3>\n<p>This VCO has two initial frequency pots, the large coarse frequency knob and the through zero offset knob.\u00a0 I measured the following frequency ranges of the coarse knob with the TZ offset knob in each of three positions.<\/p>\n<p>TZ Offset minimum:\u00a0 Very slow <strong>to 2 Hz<\/strong><\/p>\n<p>TZ Offset center: <strong>76 Hz to 5.5 KHz<\/strong><\/p>\n<p>TZ Offset maximum:\u00a0 <strong>177 Hz to 13 Khz<\/strong><\/p>\n<p>Then I added +5 volts to the 1V\/octave input.\u00a0 (And notice that just patching to this input drops the pitch almost four octaves.)<\/p>\n<p>TZ Offset minimum:\u00a0 <strong>Very slow to 6 Hz<\/strong><\/p>\n<p>TZ Offset center: <strong>240 Hz to 18 KHz<\/strong><\/p>\n<p>TZ Offset maximum:\u00a0 <strong>567 Hz to 37 KHz<\/strong><\/p>\n<p>At 37 KHz the sine wave still has a good shape.<\/p>\n<h3>Demo Recordings<\/h3>\n<h4>Waveforms<\/h4>\n<p>The first recording lets us hear the different waveforms: sine, triangle, sawtooth, pulse, and square, in that order.\u00a0 On the saw and pulse I made a manual sweep of the initial PW, SR knob.\u00a0 The best sawtooth is trimmed to be with the initial SR at zero.\u00a0 This leaves a little glitch at the other end.\u00a0 In the center of the SR knob the pitch is doubled.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2922-1\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-Waveforms.mp3?_=1\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-Waveforms.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-Waveforms.mp3<\/a><\/audio>\n<h4>SRM with an LFO<\/h4>\n<p>This next recording demonstrates the Symmetrized Ramp Modulation with an LFO.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2922-2\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-SRM-LFO.mp3?_=2\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-SRM-LFO.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-SRM-LFO.mp3<\/a><\/audio>\n<h4>Audio rate SRM<\/h4>\n<p>Here&#8217;s SRM at audio rate, manual changing the depth and varying the frequency of the modulating oscillator.\u00a0 All modulations in these demos use the sine wave from the Cali Osc, whether normal or LFO.\u00a0 I did not include a PWM demo, because I did one for the Cali Osc.\u00a0 Note that the controls for Pulse Width and Symmetrized Ramp are shared.\u00a0 Both are affected at the same time.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2922-3\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-SRM-Audio-Rate.mp3?_=3\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-SRM-Audio-Rate.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-SRM-Audio-Rate.mp3<\/a><\/audio>\n<h4>Log vs Linear FM by LFO<\/h4>\n<p>Now let&#8217;s compare using an LFO to modulate the frequency, first using the Log FM input, and then using the Linear FM input.\u00a0 You can clearly hear the EN129 reversing through zero.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2922-4\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-slow-log-lin-fm.mp3?_=4\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-slow-log-lin-fm.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-slow-log-lin-fm.mp3<\/a><\/audio>\n<h4>Through-zero FM<\/h4>\n<p>Now the grand finale:\u00a0 Full through-zero FM at audio rate.\u00a0 For this demo the TZ offset was set about 10 o&#8217;clock.\u00a0 First we hear the depth manually changed.\u00a0 Then we hear the effect of modulating dynamically, using an external VCA and envelope generator.\u00a0 During this I noodled around with the pitches of both oscillators.<\/p>\n<audio class=\"wp-audio-shortcode\" id=\"audio-2922-5\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/mpeg\" src=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-Thru-Zero-FM.mp3?_=5\" \/><a href=\"https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-Thru-Zero-FM.mp3\">https:\/\/pugix.com\/synth\/wp-content\/uploads\/2018\/08\/EN129-Thru-Zero-FM.mp3<\/a><\/audio>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Dannysound EN129 Thru-Zero Oscillator is one of a pair of DIY only oscillator kits from Thonk.\u00a0 See my post about the Cali Osc, too. The EN129 Oscillator is based &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/dannysound-en129-thru-zero-oscillator\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":2926,"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":[161],"tags":[71,25,194,22],"class_list":["post-2922","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","tag-diy","tag-lfo","tag-through-zero","tag-vco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dannysound EN129 Thru-Zero Oscillator - 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\/dannysound-en129-thru-zero-oscillator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dannysound EN129 Thru-Zero Oscillator - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"The Dannysound EN129 Thru-Zero Oscillator is one of a pair of DIY only oscillator kits from Thonk.\u00a0 See my post about the Cali Osc, too. The EN129 Oscillator is based ... 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