{"id":4682,"date":"2024-06-16T10:53:47","date_gmt":"2024-06-16T10:53:47","guid":{"rendered":"https:\/\/maffez.com\/?page_id=4682"},"modified":"2024-06-21T11:36:49","modified_gmt":"2024-06-21T11:36:49","slug":"behringer-td-3-mo-hodlmoser","status":"publish","type":"page","link":"https:\/\/maffez.com\/?page_id=4682","title":{"rendered":"Behringer TD-3-MO (H\u00f6dlmoser)"},"content":{"rendered":"\n<p>Walter P. Gruber&#8217;s satire <em>Aus dem Leben H\u00f6dlmosers<\/em> really helped me understanding how ridiculous heroism and nationalism can be. I&#8217;m not sure why this novel sprang to mind when I scored a second hand TD-3-MO-SR. Well, <em>MO-SR<\/em> is already four letters deep into <em>Moser<\/em>&#8230;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1679\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1979-scaled.jpeg\" alt=\"\" class=\"wp-image-4683\" style=\"width:610px;height:auto\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1979-scaled.jpeg 2560w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1979-300x197.jpeg 300w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n<\/div>\n\n\n<p>While I don&#8217;t like every option the TD-3-MO offers, I it can serve as a good template for implementing mods other than the ones Behringer readily took from the Whittle\/xoxbox-continuum. Part of my feelings here is that you cannot treat a DIY community like an infinite resource, but also that the Devilfish is not the alpha-omega 3D fish liver oil cure for all acidic ailments. I guess I want fun and creativity, so first of all, apologies for not documenting every nook and cranny of the MOSER (and it&#8217;s incredibly roundabout subosc) but rather keep stuff at a level of &#8211; this was fun to toy with. Moreover, if you want more, just do more. Happy to link your findings here!<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/hoedlmoser_1.mp3\"><\/audio><\/figure>\n\n\n\n<p><strong>Deactivate those LEDs<\/strong>: twiddle that blinkenbox while sipping on your neon-green energy drink? If that&#8217;s not your style, you can unscrew the bottom lid and use gaffer. Or take out the 330ohm resistors and NPN transistors near each led section.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"853\" height=\"483\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1966.jpeg\" alt=\"\" class=\"wp-image-4685\" style=\"width:469px;height:auto\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1966.jpeg 853w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1966-300x170.jpeg 300w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1966-768x435.jpeg 768w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>PSU MOD<\/strong>: like the non-murdered TD, this synth derives its 5.333V and +12V supplies from an op-amp setup. Like on the XOX, the TD3 and other clones, the power supply  of that same op-amp can be throttled by increasing a single resistor. On the MOSER this is R109 (10ohm) near the tune knob. Replace this with another SMD resistor (or through hole on the back of the PCB, as shown below) &#8211; I dunno what&#8217;s best for you as I changed the op-amp to another type on my unit and ended with some 22ohm. You might find anything up to 100ohm useful on yours. Simply test what&#8217;s what. Stuff can get a bit wonkier on this one than on the normal TD3. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"372\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1976-1024x372.jpeg\" alt=\"\" class=\"wp-image-4686\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1976-1024x372.jpeg 1024w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1976-300x109.jpeg 300w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1976-768x279.jpeg 768w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1976.jpeg 1479w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n\n\n\n<p><strong>SQUARE ADJUST<\/strong>: The Moser-square is better adjusted an the one on the simple TD-3. Still, I found that I could hollow mine out even a bit more by wiring a 220k resistor between +12V (tapped from C86). and the anode of the cap marked below. Maybe that&#8217;s a homeopathic exercise, dunno, listen to A\/B&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/sqradj_moser.mp3\"><\/audio><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"525\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/1718485998879-1024x525.jpg\" alt=\"\" class=\"wp-image-4687\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/1718485998879-1024x525.jpg 1024w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/1718485998879-300x154.jpg 300w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/1718485998879-768x394.jpg 768w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/1718485998879-1536x788.jpg 1536w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/1718485998879.jpg 1632w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n<\/div>\n\n\n<p>THE PSU adjustment can easiest be done by soldering to the anode of the cap marked here: middle cap left hand of the wave form switch. This cap stabilizes the power supply for the transistor generating the square, and if we change the supply voltage a bit (either by adding some from +12V or by pulling down to ground), we change the pulse width. NB that the square of the 303 is a weird one that changes pulse width along with frequency. <\/p>\n\n\n\n<p><strong>Rubber Mod<\/strong>: funny mod that was laughed at full tilt first but seems to have persevered. The normal TD3 sound quite stiff and sometimes staccato. As the VCA envelope was a bit changed around the &#8220;soft attack&#8221; mod, and variable VCA decay mod, this seems to be a bit different here. While the &#8220;classic&#8221; rubber mod results in clicks here, I found a 560nf-1uf cap between ground and TP4 works well for rounding stuff a bit off. While you&#8217;re at it, try some 220nf between ground and the middle pin of the VCA decay knob (simply called DECAY on the MO) as well &#8211; this shifts the pot action a bit.<\/p>\n\n\n\n<p>Manual Slide: Just insert a momentary ON switch\/pushbutton between ground and this point marked here:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"535\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1978-1024x535.jpeg\" alt=\"\" class=\"wp-image-4717\" style=\"width:538px;height:auto\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1978-1024x535.jpeg 1024w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1978-300x157.jpeg 300w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1978-768x401.jpeg 768w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1978.jpeg 1215w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/MANSLD.mp3\"><\/audio><\/figure>\n\n\n\n<p><strong>Change the dual NPN ladder filter transistors (difficult!)<\/strong>: Like the normal TD3, the Moser sports dual NPN transistors where the original 303 has single NPN pairs. Now, if you are in the camp of people finding the TD3 resonance on the shriller side, this is your reason. Since the dual NPN package in SMD form are very well matched (in addition to reasonably well matched capacitors), the spread of transfer functions across your three lowpass stages (the first of the four is a tad different) is closer than with less well matched transistors. <br><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"835\" height=\"1024\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1982-835x1024.jpeg\" alt=\"\" class=\"wp-image-4704\" style=\"width:379px;height:auto\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1982-835x1024.jpeg 835w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1982-245x300.jpeg 245w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1982-768x942.jpeg 768w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1982.jpeg 965w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/figure>\n<\/div>\n\n\n<p>Changing caps may make this somewhat diffuser but will not be as effective (despite some very verbose claims by our usual suspects) as using single NPNs (I used BC550B in my example below). 303-redesigners who know their stuff (xoxheart, for instance) go that route, the TT303 MK1 is like that (MK2 has matched pairs)&#8230; You see, while I renounce the church of capacitor, I subscribe to the temple of transistors&#8230;<\/p>\n\n\n\n<p>Stock TD3 ladder:<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/mo_standardladder.mp3\"><\/audio><\/figure>\n\n\n\n<p>BC550B for T34, T35, T36:<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/moddedladder_moser.mp3\"><\/audio><\/figure>\n\n\n\n<p>Unfortunately, this is not an easy mod since you need to pull 3x sot23-6 package transistor pairs and fit 6 new single transistors. The filter ladder being placed very close to the vco waveform switch doesn\u2018t help either\u2026<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"631\" height=\"510\" src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1973.jpeg\" alt=\"\" class=\"wp-image-4705\" style=\"width:381px;height:auto\" srcset=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1973.jpeg 631w, https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/IMG_1973-300x242.jpeg 300w\" sizes=\"auto, (max-width: 631px) 100vw, 631px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>FFM from filter out<\/strong>: cut the trace from the VCA output buffer cap (C129) leading to R249 and the FFM pot. Then rewire PIN3 of the FFM pot to the cathode of the VCF out cap (C72). You get mellower FFM action this way.<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/FFM_fromVCFout.mp3\"><\/audio><\/figure>\n\n\n\n<p> in normal and later on in high pass mode:<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/hoedlmoser_2.mp3\"><\/audio><\/figure>\n\n\n\n<p><strong>Rubberduck (filter slew)<\/strong>: wire 4.7uf cap cathode to ground and anode to on\/off switch. The other lug of the switch goes to the middle pin of ENVELOPE (amount) potentiometer.<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/fslew.mp3\"><\/audio><\/figure>\n\n\n\n<p><strong>HIGH PASS\/PHASEY FILTER<\/strong>: This is fun, though a bit more complicated to set up. Basically, you route the direct VCO out signal to the VCA input  (at C65) via a pot. When the VCF out signal and your new &#8220;direct VCO out&#8221; signal are at the same volume level, the phase relationship between the two signals turns your lowpass into a high pass. Sounds like this:<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/HP_1.mp3\"><\/audio><\/figure>\n\n\n\n<p>In terms of setting this up, I decided I do not want the pre-vcf overdrive, so I pulled out the CATHODE of C101 and wired my VCO select switch via 220k and my variable sub out via 330k directly to VCF in. I then also wired the wiper of the &#8220;Overdrive&#8221; knob via 1k (if memory serves) to that VCF input node. When pulling up the former &#8220;OD&#8221; knob, high pass now fades in. <\/p>\n\n\n\n<p><strong>VCA overdrive<\/strong>: replace R114 (220k) with a 250k pot and 6.8k resistor in series. this makes the CV-to-VCA-amount variable and (on highest setting) much higher than usual. With the muffler mod on, you get nice crunchy sounds. NB this potentially increases the noise floor a bit&#8230; here are two examples:<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/VCAODR_1.mp3\"><\/audio><\/figure>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/maffez.com\/wp-content\/uploads\/2024\/06\/VCAODR_2.mp3\"><\/audio><\/figure>\n\n\n\n<p>More soon&#8230;<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Walter P. Gruber&#8217;s satire Aus dem Leben H\u00f6dlmosers really helped me understanding how ridiculous heroism and nationalism can be. I&#8217;m not sure why this novel sprang to mind when I scored a second hand TD-3-MO-SR. Well, MO-SR is already four letters deep into Moser&#8230; While I don&#8217;t like every option the TD-3-MO offers, I it &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/maffez.com\/?page_id=4682\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Behringer TD-3-MO (H\u00f6dlmoser)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-4682","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/maffez.com\/index.php?rest_route=\/wp\/v2\/pages\/4682","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/maffez.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/maffez.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/maffez.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/maffez.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4682"}],"version-history":[{"count":0,"href":"https:\/\/maffez.com\/index.php?rest_route=\/wp\/v2\/pages\/4682\/revisions"}],"wp:attachment":[{"href":"https:\/\/maffez.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}