{"id":2449,"date":"2017-12-17T14:57:47","date_gmt":"2017-12-17T19:57:47","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=2449"},"modified":"2023-05-05T12:05:54","modified_gmt":"2023-05-05T17:05:54","slug":"ciat-lonbarde-sidrassi-schematic","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/ciat-lonbarde-sidrassi-schematic\/","title":{"rendered":"Ciat-Lonbarde Sidrassi Schematic"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Peter Blasser’s Sidrassi circuit was the first incarnation of an evolution of his design for a seven-oscillator organ.\u00a0 Others have told the story well.<\/p>\n

Fans of the Sidrassi\/Sidrazzi\/Sidrax have never to my knowledge had access to a schematic diagram, either by Peter B. in his inimical style (as we have of the Tetrazzi) or by anyone else.\u00a0 I could be mistaken.\u00a0 But we do have a detailed graphic of the hand-assembled PC board for the Sidrassi, pictured above.<\/p>\n

Working from a printout of this graphic, I reverse engineered a schematic diagram so that we can get more insight into the design.\u00a0 We already know how it works, as a black box.\u00a0 But I’ve always wondered what the ‘glitch’ inputs actually did.\u00a0 The answer is not surprising, but is revealing.<\/p>\n

I hand drew the following three schematics.\u00a0 The first contains the oscillator proper with all of its modulation inputs.\u00a0 (You should be seeing v1.1, which adds a truth table and corrects the circuit around the glitch inputs.) The second contains the dual VCA, operated by the bars, that goes with each channel.\u00a0 The third schematic collects up some of the common areas of the circuit.\u00a0 All op amps are from TL084 quad DIP.<\/p>\n

Nodes are the external patch points, six per section:\u00a0 Frequency Modulation in, Pulse out, two Glitch inputs, two Bar outputs.\u00a0 My drawing shapes for the nodes correspond to the graphics around the node lands on the PC board.<\/p>\n

Oscillator<\/h4>\n

\"\"<\/a><\/p>\n

I drew the Oscillator #4 perspective to show that the chaos modulation comes from Oscillator #5, and how the bounds modulation oscillators are related to #4.\u00a0 This continues in a ring around all seven oscillators.\u00a0 The upper, middle section of the drawing is the VCO proper.\u00a0 Current from pin 12 of an LM13700 OTA charges the hairy capacitor (value unspecified), which is buffered by an op amp and sent to other parts of the Sidrassi as Internal CH 4 Out.\u00a0 This is the triangle wave (brought out to the red banana jack on the Sidrax<\/em>).\u00a0 On Sidrassi the output node is a pulse.<\/p>\n

FM<\/p>\n

Frequency (oscillator pitch) is determined by a mix of four sources.\u00a0 First, the master frequency pot which drives all oscillators, second, by the Scroll sample & hold button, third by an FM input node, and finally from the next Oscillator through a VCA made from the other half of the OTA and operated by the Chaos pot to control the modulation depth.<\/p>\n

Bounds Modulation<\/p>\n

More Peter Blasser genius.\u00a0 An 8-to-1 selector (4051) has the logic bit A switched by the rate of the oscillator itself.\u00a0 By default it chooses a lower bound of 0.25 Vcc and upper bound of 0.75 Vcc.\u00a0 With Vcc of 9 volts, these points are 2.25V and 6.75V, making for a 4.5V P-P triangle wave.\u00a0 This is the default, until a glitch input is gated on.<\/p>\n

The glitch inputs create two binary signals to control the 8-to-1 selector (4051) for choosing a pair<\/strong> of the other internal channel outs (out of six) to impact the upper and lower bounds of the oscillator.\u00a0 Inputs C, B, A of the 4051 constitute a three bit control for the selector.\u00a0 See the truth table in the diagram.\u00a0<\/em> Without active glitch inputs C is low, B low, and A toggles at the rate of oscillation to create the default bounds.\u00a0 With glitch inputs active, the multiplexer will select two of the other six oscillators for bounds modulation.\u00a0 Since bit A is driven by the pulse of the same oscillator, the they will be switched between at that rate.\u00a0 Thus, with the B glitch input active, the bounds will be determined by inputs 2 and 3 (which for oscillator #4 are oscillators #5 and #6).\u00a0 With only C input active the bounds are set by inputs 4 and 5.\u00a0 And with both glitch inputs active the bounds are set by inputs 6 and 7.\u00a0 It seems that at times the lower bound will be higher than the upper bound, confusing the oscillator.\u00a0 As intended!<\/p>\n

Scroll<\/p>\n

The big red scroll button imparts a random offset to the frequency.\u00a0 It’s a clever circuit that oscillates while the button is pressed and then holds a value on release.\u00a0 These were replaced with slide pots on Sidrax<\/em>, a concession to ‘playability’.\u00a0 A hairy scroll capacitor sets the rate.\u00a0 I don’t know what the value was.<\/p>\n

Bars and VCAs<\/h4>\n

\"\"<\/a><\/p>\n

Pressing the bars gates the signal from an oscillator through to the output mixer.\u00a0 I’m not sure which is the left and right channel.\u00a0 The schematic shows the internal CH 4 output being routed to the inputs of two transistor VCAs.\u00a0 The piezo transducer glued to the bar controls each channel inversely.\u00a0 Bar press and release CV outputs are present at a connector for the two nodes (orange banana jacks on the Sidrax<\/em>).\u00a0 The outputs of the VCAs route to the left and right output mixers through 22K resistors.\u00a0 (These resistors are shown on both the above and below schematics.)<\/p>\n

Common Circuitry<\/h4>\n

\"\"<\/a>The output mixers are shown to the left.\u00a0 Just a simple FET buffer, much like Lil Sidrassi.\u00a0 The pots for master frequency and chaos are shared by all seven oscillators.\u00a0 Mido is Peter’s way of referring to a middle voltage between Vcc and ground.\u00a0 I show it as a little circle.\u00a0 Mido is buffered by an op amp and distributed across the board.<\/p>\n

I did not draw the power circuitry, because I couldn’t fully understand it.\u00a0 There seems to be a spot for a battery on the board.\u00a0 I can see a power inlet with a switch to cut off the battery if external power is connected, much like other of Peter’s designs.\u00a0 However there is a three-pin location with strange symbols around it.\u00a0 Please comment if you have any idea what this was for.<\/p>\n","protected":false},"excerpt":{"rendered":"

Peter Blasser’s Sidrassi circuit was the first incarnation of an evolution of his design for a seven-oscillator organ.\u00a0 Others have told the story well. Fans of the Sidrassi\/Sidrazzi\/Sidrax have never … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":2454,"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":[122,188,145,142],"class_list":["post-2449","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciat-lonbarde-instruments","tag-ciat-lonbarde","tag-sidrassi","tag-sidrax","tag-sidrazzi"],"yoast_head":"\nCiat-Lonbarde Sidrassi 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\/ciat-lonbarde-sidrassi-schematic\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ciat-Lonbarde Sidrassi Schematic - Richard Brewster's Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"Peter Blasser’s Sidrassi circuit was the first incarnation of an evolution of his design for a seven-oscillator organ.\u00a0 Others have told the story well. 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