{"id":2951,"date":"2018-08-21T13:54:36","date_gmt":"2018-08-21T18:54:36","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=2951"},"modified":"2024-12-25T11:09:08","modified_gmt":"2024-12-25T16:09:08","slug":"randomsource-serge-dusg","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/randomsource-serge-dusg\/","title":{"rendered":"Random*Source Serge DUSG"},"content":{"rendered":"

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

The Serge Dual Universal Slope Generator is a legend in modular synthesis.\u00a0 It is the basis of most voltage controlled slew modules, including Make Noise Maths<\/a>.\u00a0 I have built a pair of Ken Stone’s Serge VCS<\/a> in MOTM format and also Ken’s DUSG<\/a> in my pseudo BugBrand format.\u00a0 Earlier I had built a pair of MOTM-820 with Oakley OMS-820<\/a> to imitate the DUSG.\u00a0 It is a legend, because it is able to perform a multitude of different functions, from VCO, LFO and Envelope Generator to Lag Processor and Pulse Divider.<\/p>\n

In Eurorack I have a pair of Steady State Fate Mini Slew modules.\u00a0 But I wanted to add yet another DUSG that I could use in a different Eurorack case.\u00a0 I decided on the Random*Source DUSG, available as a DIY kit from Thonk.\u00a0 The kit contains all parts needed and comes with surface-mounted components already soldered onto the boards.\u00a0 It is a relatively easy build.<\/p>\n

Features<\/h3>\n

The Random*Source Serge DUSG has panel features similar to the Catgirl Synth Serge Voltage Controlled Slope, but doubled.\u00a0 But there are a few differences.\u00a0 R*S DUSG substitutes a Pulse out on one side in place of the Bipolar output.\u00a0 Maybe they should have called this Square, because that’s what it is.\u00a0 A useful addition.\u00a0 Secondly, the switch that controls the response curve for the CV inputs is three-position with a center off.\u00a0 Center off disconnects the feedback from the output to the CV input completely, which is handy to get the linear slope.\u00a0 The two positions allow selecting logarithmic or exponential responses that without an CV patched in allow the CV attenuverters to modify the curve of the slope.\u00a0 The manual doesn’t have details on this curve feature, but I’m planning to investigate it farther and compare to the VCS.<\/p>\n

Panel Design<\/h3>\n

The panel is a Eurorack style, using Davies knobs like Serge.\u00a0 The graphic around the CV attenuverters resembles classic Serge.\u00a0 Random*Source supplies a red LED for the left and a yellow for the right.\u00a0 A trimpot lets you adjust the brightness of these LEDS and I set it to maximum.\u00a0 The LED can indicate only a positive voltage, which is normal when oscillating or making envelopes, although the outputs can track negative when following an external input.<\/p>\n

The jacks-on-top design is perfect for my application (see below).<\/p>\n

I don’t understand the color coding around the jacks.\u00a0 I’m not sure about the Serge banana jack color coding scheme, either.\u00a0 Serge tended to use Red for pulse type inputs and outputs, and Black and Blue for other inputs and outputs kind of willy-nilly.\u00a0 R*S chose a surround color for the mini-jacks that somewhat resembles this, at least in the use of Red for Trig in, End and Pulse out.\u00a0 The CV inputs are all white, but so is the main output.\u00a0 The inputs and bi-polar output are Black.\u00a0 If the main outs were Black it would seem more consistent to me.<\/p>\n

Construction Photos<\/h3>\n
\"\"<\/a>

Back side of main component board<\/p><\/div>\n

\"\"<\/a>

Top side of main component board<\/p><\/div>\n

Pictured above is the back and top sides of the smaller PC board, the one that holds most of the circuitry.\u00a0 Power header and trimpots are on the back.\u00a0 After assembly to the panel board the top side of this board is inside.\u00a0 Electrical connections between the two boards are routed via eight header pairs, with the male pins on the component board and the female sockets on the panel board.<\/p>\n

\"\"<\/a>

Back side of the panel board<\/p><\/div>\n

\"\"<\/a>

Rear assembly view<\/p><\/div>\n

Pictured above is the back side of the panel board, showing the female headers.\u00a0 Panel pots, switches, jacks, and LEDs are soldered to the opposite side of this board.\u00a0 The lower photo shows the two boards together.\u00a0 Below is another perspective on the final assembly.<\/p>\n

\"\"<\/a>

Side view of final assembly<\/p><\/div>\n

All panel parts are inserted into the PC board, but not soldered until the panel is affixed over them and all parts have been tightened down to the panel.\u00a0 The spacing between the panel and board seems just about perfect.<\/p>\n

Mystery Header<\/h4>\n

The back of the panel board has a header position, unfilled, with what looks like two jumper options, labelled S and E.\u00a0 There’s nothing about this in the construction manual.\u00a0 I wonder what it’s for.\u00a0 I kind of regret not soldering in header pins, so I could try it out.\u00a0 Now I’d have to remove the panel for access to solder.<\/p>\n

\"\"<\/a>

Mystery header location<\/p><\/div>\n

In the Box<\/h3>\n

Here’s where I put the DUSG.\u00a0 It works nicely in this case, which has controllers mostly below and audio processing above.\u00a0 The jacks-on-top design fits right into my plan.<\/p>\n

\"\"<\/a>

DUSG in my case<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

The Serge Dual Universal Slope Generator is a legend in modular synthesis.\u00a0 It is the basis of most voltage controlled slew modules, including Make Noise Maths.\u00a0 I have built a … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":2952,"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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[161],"tags":[71,159,132,187],"class_list":["post-2951","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","tag-diy","tag-eurorack","tag-serge","tag-slew-limiter"],"yoast_head":"\nRandom*Source Serge DUSG - 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\/randomsource-serge-dusg\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Random*Source Serge DUSG - Richard Brewster's Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"The Serge Dual Universal Slope Generator is a legend in modular synthesis.\u00a0 It is the basis of most voltage controlled slew modules, including Make Noise Maths.\u00a0 I have built a ... 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