{"id":1706,"date":"2015-11-22T11:02:01","date_gmt":"2015-11-22T16:02:01","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=1706"},"modified":"2020-12-10T11:00:03","modified_gmt":"2020-12-10T16:00:03","slug":"explaining-the-quantussy-schematic","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/explaining-the-quantussy-schematic\/","title":{"rendered":"Explaining the Quantussy Schematic"},"content":{"rendered":"

You can find a lot of posts here, under the cocoquantus and the quantisise tags, where I have explained the architecture of the five oscillator cluster in the Cocoquantus.\u00a0 The cluster is sometimes called the Quantussy.\u00a0 It consists of five voltage-controlled oscillators, each internally clocking a pair of sample and holds.\u00a0 Each VCO puts out a triangle wave, represented by a star shape on the graphics.\u00a0 One of the sample and holds samples the triangle wave of one of the other four VCOs and its output is called the Castle output.\u00a0 The frequency modulation input to each VCO comes from an analog switch, which is used to select the Castle output of one of the other four VCOs.\u00a0 The same switch also selects the same ‘partner’ VCO’s triangle wave as the input to the Castle sample and hold.<\/p>\n

Here’s the schematic<\/a> published by Peter Blasser.<\/p>\n

Please refer to the last page of the schematic in another tab while reading this explanation. Resistors are in ohms (e.g. 104 is 10 followed by 4 zeros, or 100,000 ohms) and capacitors are in picofarad (e.g. 104 is 100,000 pf, or 0.1 microfarad).<\/p>\n

The schematic is divided down the middle into two parts.\u00a0 On the left is INNEROUTER SPIRALS, FM OSCILLATOR<\/strong>, and on the right, PROCESSOR OF DAGGERPULSE<\/strong>.\u00a0 The two parts are connected!\u00a0 Peter’s schematic has shortcuts.\u00a0 Find the little dagger.\u00a0 On the left side, the dagger connects to the square wave output of the VCO.\u00a0 There’s a standard VCO schematic on the top left.\u00a0 Note the three-position toggle switch that selects a capacitor for the range.\u00a0 The VCO core is made from an Operational Transconductance Amplifier (OTA), LM13700, and a dual op amp, TL082.\u00a0 Half of the op amp buffers the integrating capacitor to make the triangle output.\u00a0 The other half of the op amp is a comparator that outputs a square wave.\u00a0 This goes into the OTA to reverse the current and start the triangle slewing the other direction.\u00a0 But the square also clocks the sample and holds through a pulse counting network.\u00a0 The dagger connects them.\u00a0 Note that the 4052 chip is drawn on both sides.\u00a0 It’s the same chip!<\/p>\n

Processor of Daggerpulse<\/h3>\n

It’s a counter made from a pair of Flip-Flops (FF), a CD4013, and a network of diodes.\u00a0 Note the three LEDs: red, yellow, and blue, the visual indicators located in the center of the Cocoquantus.\u00a0 The Processor of Daggerpulse’s purpose is to drive the CD4052 chip, which serves both as a dual switch and a dual sample and hold.\u00a0 The CD4052 is a dual four-to-one selector.\u00a0 The inputs are indicated by the two spirals of four wires each.\u00a0 One set comes from the triangle outputs of the other oscillators; the other set come from the castle outputs.\u00a0 The two are selected in tandem.\u00a0 That is, the triangle and castle outputs of the same VCO are selected together.\u00a0 The CD4052 has a two-bit selector input (A and B).\u00a0 If you look very carefully, you can see a capital A and B drawn on the schematic at the outputs of the op amp and the first flip-flop.\u00a0 These select which of the other four oscillators is chosen.\u00a0 But the CD4052 also has an Inhibit input.\u00a0 When Inhibit is enabled (high), then no other oscillator is selected.\u00a0 And since there is a 1 microfarad capacitor on the output, the last voltage will be held, hence creating a sample and hold.\u00a0 Technically, it’s a follow and hold circuit that gets pulsed to make it sample and hold.\u00a0 I don’t fully understand the switching matrix of diodes.\u00a0 C is the Inhibit input.\u00a0 Four diodes are connected to C.<\/p>\n

There’s also a small circle (which indicates a brass panel screw, or a green banana jack on the Cocoquantus V2) that is the input to a trigger generator that clocks the counter.\u00a0 If you touch this, the LEDs seem to jump randomly.\u00a0 If you clock that input, by patching to it, you can then see the binary counting.<\/p>\n

Frequency Modulation<\/h3>\n

The lower left side of the schematic shows the CV section.\u00a0 It consists of a VCA, which controls the depth of FM, and a current source for controlling the frequency of the VCO.\u00a0\u00a0 There are three inputs to control FM, two panel controls and one CV.\u00a0 The first panel control is an initial frequency setting.\u00a0 It affects all five oscillators.\u00a0 The CV comes through the selector switch from one of the other Castle outputs.\u00a0 This passes through a VCA to control the depth of FM.\u00a0 The Chaos panel knob\u00a0 controls the FM depth simultaneously of all five VCOs.\u00a0 There is no way to patch a CV into this VCA.\u00a0 (I added this feature to the Quantisise.)<\/p>\n","protected":false},"excerpt":{"rendered":"

You can find a lot of posts here, under the cocoquantus and the quantisise tags, where I have explained the architecture of the five oscillator cluster in the Cocoquantus.\u00a0 The … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":3981,"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":[127],"tags":[113,180],"class_list":["post-1706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciat-lonbarde-instruments","tag-cocoquantus","tag-quantussy"],"yoast_head":"\nExplaining the Quantussy Schematic - Richard Brewster'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\/explaining-the-quantussy-schematic\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Explaining the Quantussy Schematic - Richard Brewster's Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"You can find a lot of posts here, under the cocoquantus and the quantisise tags, where I have explained the architecture of the five oscillator cluster in the Cocoquantus.\u00a0 The ... 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