{"id":465,"date":"2009-07-03T18:16:09","date_gmt":"2009-07-03T23:16:09","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=465"},"modified":"2024-06-29T14:04:40","modified_gmt":"2024-06-29T19:04:40","slug":"teezer-through-zero-vco","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/teezer-through-zero-vco\/","title":{"rendered":"Teezer Through Zero VCO"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-panel.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"466\" data-permalink=\"https:\/\/pugix.com\/synth\/teezer-through-zero-vco\/teaser-panel\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-panel.jpg?fit=190%2C478&amp;ssl=1\" data-orig-size=\"190,478\" 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=\"teaser-panel\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-panel.jpg?fit=190%2C478&amp;ssl=1\" class=\"alignleft size-full wp-image-466\" title=\"teaser-panel\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-panel.jpg?resize=190%2C478&#038;ssl=1\" alt=\"teaser-panel\" width=\"190\" height=\"478\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-panel.jpg?w=190&amp;ssl=1 190w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-panel.jpg?resize=119%2C300&amp;ssl=1 119w\" sizes=\"auto, (max-width: 190px) 100vw, 190px\" \/><\/a>Ian Fritz, January 2009<\/p>\n<blockquote><p>This module is a sawtooth-based VCO capable of frequency modulation (FM) extending past zero frequency into the negative-frequency regime. Thru-zero FM provides a much wider and richer variety of sounds than &#8220;ordinary&#8221; (positive frequency only) FM.<\/p>\n<p>The negative-frequency version of a waveform is simply a time-reversed replica of the original waveform.&nbsp; When a VCO is modulated through zero frequency, the waveform slows down to a stop and then speeds back up in the reverse direction.<\/p>\n<p>The Teezer&#8217;s output waveforms also include triangle and sine waves, for producing sounds with fewer high harmonics, as typically used for bell sounds, train whistles, and so on. The unit also features a variable synchronization control that can be adjusted over a range of settings from hard sync to a fairly loose soft sync.&nbsp; The module can also serve as a highly accurate and stable &#8220;ordinary&#8221; VCO (i.e., without the deep FM), with upramp, downramp, triangle and sine output waveforms.<\/p><\/blockquote>\n<p><a href=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-back.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"375\" data-attachment-id=\"467\" data-permalink=\"https:\/\/pugix.com\/synth\/teezer-through-zero-vco\/teaser-back\/\" data-orig-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-back.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=\"teaser-back\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-back.jpg?fit=500%2C375&amp;ssl=1\" class=\"aligncenter size-full wp-image-467\" title=\"teaser-back\" src=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-back.jpg?resize=500%2C375&#038;ssl=1\" alt=\"teaser-back\" srcset=\"https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-back.jpg?w=500&amp;ssl=1 500w, https:\/\/i0.wp.com\/pugix.com\/synth\/wp-content\/uploads\/2009\/07\/teaser-back.jpg?resize=300%2C225&amp;ssl=1 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>A really cool, inexpensive through-zero VCO!&nbsp; The Bridechamber panel is nice quality.&nbsp;&nbsp; Its quirky layout with the offset pots and jacks is non-conformist, in keeping with the module itself!<\/p>\n<p>Construction comments<\/p>\n<p>I got the panel, PC board, and a kit of some special parts from <a title=\"Teezer panel\" href=\"http:\/\/www.bridechamber.com\/bridechamber.com\/F_Teezer.html\" target=\"_blank\" rel=\"noopener\">Bridechamber<\/a>.&nbsp; High quality pots are used throughout.&nbsp; As shown in the photo, I was able to mount the PC board to a Stooge 4-pot short bracket I had lying around.&nbsp; The PC board was not designed for the bracket.&nbsp; I could use only four of the six mounting holes in the board and had to drill holes in the bracket to match.&nbsp; There was just enough room.&nbsp; The power connector sits on the back of the board, cantilevered over the end of the panel.&nbsp;&nbsp; I wish Mr. Fritz had provided more ground lands on the PC board; there is only one included in each of the two header-style connectors.&nbsp; I used twisted pair for all the IO wiring and glommed all the grounds together onto a solid wire soldered into the one hole.<\/p>\n<p>Circuit comments<\/p>\n<p>I did the 15 volt power supply modification, as described in the instructions, using zener diodes in place of ferrite beads.&nbsp; Five separate internal power busses are used!&nbsp; Prior to soldering in the integrated circuits I connected power and verified all the supply voltages were as expected.&nbsp; Good thing, because I had installed one zener diode backwards!&nbsp; That was easy to fix.&nbsp; As recommended, I had carefully matched the zener diodes D12 and D13 to within 0.01 volt.&nbsp; Despite this, the triangle wave had a glitch that could not be trimmed out.&nbsp; I modified the circuit to add a small resistor and got an improved waveform.&nbsp; Still there is a small glitch that is audible as a harmonic.&nbsp; You can hear this in the MP3 below.<\/p>\n<p>Performance comments<\/p>\n<p>This VCO tracks very well over at least six octaves.&nbsp; I didn&#8217;t notice any problems.&nbsp; I compared the thru-zero FM with the Cyndustries ZerOscillator (ZO).&nbsp; The two VCOs do FM quite differently.&nbsp; The Teezer has a simple-to-understand Initial Frequency pot that is a manual input to the linear FM.&nbsp; In the mid position, the frequency is theoretically zero.&nbsp; To the right is positive frequency (and a rising sawtooth) and to the left is negative frequency (falling sawtooth).&nbsp; The Coarse Tune has an extremely wide range with audio frequencies being to the right of center.&nbsp; Very low frequencies are possible for LFO use.<\/p>\n<p>Through Zero shootout<\/p>\n<p>I found that comparable effects are obtained from the ZO with the Range in HIGH and Bias switch in the LOW position.&nbsp; For this test recording, I used a MOTM-300 sine wave as the modulation source.&nbsp; The ZO and Teezer were set to the same initial frequency and the triangle outputs of each VCO were sent to a mixer.&nbsp; You first hear the ZO unmodulated triangle, followed by a manual twisting of the LIN FM pot up and back.&nbsp; This fades out and fade in to the unmodulated Teezer.&nbsp; Here you notice more harmonics on the triangle than the ZO.&nbsp; The LIN FM pot is twisted up and back.&nbsp; This is a log pot on the Teezer (vs a linear pot on the ZO), so my jerky fingers are more noticeable.&nbsp; You hear a slight beat also, which could be tuned out with the fine tuning.&nbsp; I haven&#8217;t yet understood how to make the best use of the relationship between the initial and coarse frequency pots.<\/p>\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"  http:\/\/pugix.com\/synth\/wp-content\/uploads\/zo-vs-teezer.mp3 \"><\/audio><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Ian Fritz, January 2009 This module is a sawtooth-based VCO capable of frequency modulation (FM) extending past zero frequency into the negative-frequency regime. Thru-zero FM provides a much wider and &#8230; <a class=\"styledbutton\" href=\"https:\/\/pugix.com\/synth\/teezer-through-zero-vco\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":467,"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":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[10],"tags":[71,107,22],"class_list":["post-465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other","tag-diy","tag-fritz","tag-vco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Teezer Through Zero 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\/teezer-through-zero-vco\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Teezer Through Zero VCO - Richard Brewster&#039;s Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"Ian Fritz, January 2009 This module is a sawtooth-based VCO capable of frequency modulation (FM) extending past zero frequency into the negative-frequency regime. 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