spring reverb build instructions
Contents
1. 15 B50K a B10K Next position the four jacks and three pots and single LED in place on the board but DO NOT SOLDER any of them yet The LED is in the pink ESD bag with yellow sticker It won t actually stand upright from the PCB as shown in the image yet it ll just drop down NOTE Ensure the the longer lead on the LED goes into the square hole marked with a Ensure black face of the jack faces this way Modified Jacks step 13 DO NOT SOLDER YET 16 Put the three plastic washers on the pot shafts January 2nd 2015 www thonk co uk 8 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions 17 You didn t solder the pots and jacks yet did you Good Put the faceplate on White PCB material or Aluminium and tighten a few nuts on to make sure everything is sitting true and flat Now solder the pots and jacks not the LED yet and make sure it doesn t fall out in the process There are 5 solder points per pot and 4 solder points per jack 31 solder joints in total NOTE It s easy to accidentally miss a joint at this point so advise double checking the 31 joints again after you ve finished 18 The LED should still be loose Push it up through the hole in the panel and it should hold in place Solder it Remove the front panel again Be careful to not bend the LED as it s quite exposed now January 2nd 2015 www thonk co2. Bend up the two ground rings so it ll be easier to solder wires to them It s vital that the nuts are tight and that the ground rings do NOT touch Don t let the NOTE If the ground rings touch then grounding th dule will not k ring touch e module will not work deren socket body Once the nuts are secure and the rings are apart they are unlikely to touch each other again but you also have to make sure that they Don t let the don t touch the metal shrouds on the eavea gap grounding ring 3 5mm jack sockets OR protrude rotate below down to a position where they can this dotted line touch the aluminium rail in your synth case ee a i There is significant variation in Eurorack case mounting rails Take particular care with rails which don t have a lip which stops the front panel moving vertically beyond a certain distance i Even with a lip you may find that one or both nuts on the RCA jacks can make contact with the Aluminium rail This won t damage the module but it will stop the real spring reverb working You may want to consider putting thick insulating tape on the I inside edge of the case rail to stop this happening It won t be visible once the module is screwed into place January 2nd 2015 www thonk co uk 17 Music Thing Modular Eurorack DIY Kit Version 0 91 V Spring Reverb Module Instructions 36 Wire up the RCA jacks as shown ye You need to strip twist and tin the oO en
3. Version 0 91 22K 2 2K 68K 10K 10K e rtl oe est T 3 o x 11 Music Thing Modular Eurorack DIY Kit Version 0 91 V Spring Reverb Module Instructions 23 Now solder the single 22uF Electrolytic capacitor into place at position C8 NOTE Orientation is vital on this part The grey stripe should be positioned as shown and the shorter lead of the component should go into the hole marked on the PCB 24 Solder the three remaining 10uF Electrolytic capacitors into place at positions C2 C14 and C17 NOTE Orientation is vital on this part The grey stripe should be positioned as shown and the shorter lead of the component should go into the hole marked on the PCB 25 Take the protective pink ESD bag with yellow sticker out of the main bag and find the 78L05 voltage regulator E 7 bene 7 ee BRT as te Ss ri e Paz G OA O 7 eae da o Za an The middle lead needs to be bent en le slightly towards the semi circular face ij aah TMH An Sar T of the transistor body the component should sit in a tripod configuration on the three leads NOTE Do not heat this part excessively or you will damage it NOTE Do not solder the 2N3904 you should be aiming to solder voltage regulator into this position quickly and neatly Apart from the text marking it looks identical January 2nd 2015 www thonk co uk 12 Music Thing Modular Eurorack DIY Kit Version 0
4. sockets are soldered flush and perpendicular to the PCB surface 30 If you are using an accutronics digital brick optional then solder this into place now The bricks are available in different reverb tail lengths If you think you might want to switch these out depending on taste then you might want to use a 6 pin female NOTE Do not heat the brick or header not included instead of rework it excessively or you will soldering directly to the board damage it you should be aiming to solder quickly and neatly January 2nd 2015 www thonk co uk 14 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions 31 You can skip to step 32 if you have the panel with RCAs on the front If you have a kit with rear RCA connectors for the real spring tank then these should be soldered now 32 Screw in the two brass hex spacers into place Make sure you use two of the shorter machine screws not the two longer screws which are provided to mount the finished module into your case NOTE This spacer may cause the C2 Electro Capacitor to lean over but this shouldn t cause a problem Make sure the circle on the top face of the ICs are both at the end with the notch in the IC socket Now fit the two remaining TLO72 ICs 33 Gently splay apart the two 100n capacitors at the end of the PCB as shown The solitary 10uF capacitor on the other PCB will nestle between them once
5. solder the 78L05 voltage regulator into this position NOTE Do not heat this part Apart from the text marking it looks excessively or you will damage it identical you should be aiming to solder quickly and neatly 8 Next take the Vactrol from the Main Bag and solder into place as shown oP The orientation of the 4 pins is vital we eS to the top surface of the PCB and sit within the boundary of the PCB NOTE Do not heat this part excessively or you will damage it you should be aiming to solder quickly and neatly 9 If you use organic solder that can be washed with water then now is the perfect time to do that Make sure you leave your PCB to dry in a warm place for at least 30 minutes before progressing further January 2nd 2015 www thonk co uk 5 Music Thing Modular Eurorack DIY Kit Version 0 91 V Spring Reverb Module Instructions 10 Next you should solder in the 8 pin and 14 pin IC sockets Make sure FS Orr 0 ABS these sockets are soldered flush and 995 0000 ve Ute 02 perpendicular to the PCB surface Se ES 5 O E On BX A 0 298 Gre gt JE E Sime NELAS 100K 10K Then solder the 4 remaining vertically positioned resistors e 10Kx1 e 47K x2 e 100K x1 47K Solder each pair of vertical resistors so they are in a mirrored configuration This removes the chance of them hitting each other and shorting 11 Now flip the board over and solder the one of the four
6. uk 9 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions 19 Go back to the ESD bag and take out the TLO74CN and NE5532P IC s In order to fit them into the IC sockets you need to bend the pins inward slightly Do this with a pair of pliers or If you re careful you can bend each row manually on the top of table A The pins ideally should be perpendicular to the body of the IC NOTE the below image is ROTATED compared to previous images Fit the IC s in the positions shown Notch NOTE You will wreck the IC s and Pee ge Se possibly other components if you w power up with them in backwards bee Notch You have finished with this PCB for now it s time to switch to the other one January 2nd 2015 www thonk co uk 10 Music Thing Modular Eurorack DIY Kit V Spring Reverb Module Instructions 20 First solder all the resistors on the PCB There are no vertical resistors on this PCB 21 Solder the single 10n capacitor into place at C3 in labeled bag 21 Solder the single 2 2n capacitor into place at C9 in labeled bag 30 02 goon We 22 solder the remaining four 100n capacitors originally on the cardboard strip of eight you soldered the other four on the other PCB Remember that while they are shown as blue in the image to the right the ones supplied with the kit are dark yellow January 2nd 2015 www thonk co uk
7. 10uF Electrolytic Capacitors into place NOTE Orientation is vital on this part The grey stripe should be positioned as shown and the longer lead of the component should go into the hole marked on the PCB January 2nd 2015 www thonk co uk 6 Music Thing Modular Eurorack DIY Kit Version 0 91 V Spring Reverb Module Instructions 12 Next solder the 5 pin female socket into position 13 Next you need to make a small modification to the 3 pots You need to snap cut or file off the small metal tag that protrudes from the top surface of the pot body as indicated The easiest way is to snap off with pliers it comes off very easily If you cut or file it off be careful not to damage the thread on the shaft 14 Next you need to make a small modification to two of the four 3 5mm jacks sockets You need to cut off a small section on one side of the grounded metal shroud that surrounds the plastic body of the jack Do not cut off any of the other tabs of metal If you don t have anything you can cut these with you can also just bend this small section away from the body of the jack NOTE This is done otherwise it is possible although not 100 that a short circuit is made with the wiring pads that sit at the very end of the PCB These wiring pads are not used in this build January 2nd 2015 www thonk co uk 7 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions
8. 91 V Spring Reverb Module Instructions 26 ez N a BE A Solder the yellow fuses and the two 0 i a mO black diodes into place QN o e amp r a 9 oooO i ia fa a OOOO FUSE x2 5 i et NOTE Take care with the orientation of the silver ends of the diodes which match the thick white stripes on the a x o r A QJ 78L86 silkscreen NOTE Do not heat the diodes excessively or you will damage them you should be aiming to solder quickly and neatly 27 Next solder the 5 pin header into place 28 Solder the ten pin power header and three pin reverb selection header into place on the other side of the board Do not solder with the shunt in place place it on the header after the 3 pin header has cooled The shunt supplied might be black Set the shunt to Spring to use an external spring tank or Brick for the digital brick January 2nd 2015 www thonk co uk 13 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions If you use organic solder that can be washed with water then now is a NOTE If you wash the board put good time to do that Make sure you the shunt somewhere safely first leave your PCB to dry in a warm place for at least 30 minutes before progressing further 29 Solder the blue multi turn trimmer into place as shown alias Notch Notch Next you should solder in the two 8 pin IC sockets Make sure these
9. INTS Your solder joints should look like those shown as OK below they should have that neat conical shape on BOTH sides of the PCB If they don t look the same on both sides then stop Work out why from the soldering guides linked and don t continue until you are getting those results This isn t just OCD talking you are very likely to end up with a destroyed damaged or defective unit if you re not hitting that standard Insufficient Wetting Pin amp Pad Insufficient Wetting Pad me T n gt e gt S s Tan gmi Too Much Solder Cold Joint w Insufficient Wetting Pad 9 i y w E E u a Se i N o lea ES 7 Ax fwd eh a This photo is from the Adafruit guide to excellent soldering http bit ly 1jxqF3n and is reproduced under an Attribution Sharealike creative commons license http creativecommons org licenses by sa 3 0 January 2nd 2015 www thonk co uk 2 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions SPRING REVERB BUILD INSTRUCTIONS Start by emptying the Resistors and Capacitors bag into one bowl or container and the Main Bag into another This makes it much easier to pick parts as you need them and you re less likely to lose anything ori D 2 KI 999 e LONE 4 NE5532 7 1C2 0 Ce a 5 ATAY Start with the front PCB as pictured 19 OA sout ACO ys a
10. Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions OVERVIEW For the most recent version of this document please visit http thonk co uk documents springreverb For all technical support please visit http bit ly 1 96uq9j on Muffwiggler This document must be read in conjunction with the Music Thing Modular user manual http bit ly 197HLOU All Thonk kits are sold under our standard Terms and Conditions http www thonk co uk faq DIY INSTRUCTIONS This document gives detailed instructions that assume you have purchased a complete kit from www thonk co uk It also assumes no previous knowledge of electronics To learn to solder try http youtu be l_NU2ruzyc4 and the Adafruit guide to excellent soldering http bit ly 1177tF4 Watch and understand that whole YouTube video If you re not achieving the results shown in the video then you need to buy new tools or seek advice You will not end up with a working module otherwise TOOLS REQUIRED Soldering iron snipe nose pliers wire strippers small flat head screwdriver and diagonal cutters AKA snips AKA side cutters A Digital Multimeter is always helpful for checking for bad solder joints and continuity Thonk sell a range of inexpensive tools here http bit ly 1 xqF3n January 2nd 2015 www thonk co uk 1 Music Thing Modular Eurorack DIY Kit Version 0 91 V Spring Reverb Module Instructions SOLDER JO
11. an 2 21 L 8k KASN 5 R The first job is to solder all the resistors that are positioned horizontally These are e 1kx1 99k x3 10K 6 8K 47K e 6 8k x2 2 2K 1K e 10k x1 e 47K x1 R7 value not marked i iS ICR e 100k x4 TLO74 C gt Pe TTI TOT re 12 Ate Hr2en Q a 033740 g K l gt 3 6 8K 100K January 2nd 2015 www thonk co uk 3 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions 3 Next solder the four 100n capacitors They come in a strip of 8 parts and are Dark Yellow in colour rather than blue as shown in the PCB image 4 Next solder the single 1nf capacitor in the position shown 5 hs o 2N Next solder the single 22pf capacitor in the position shown Q A y 33 4 re Pont SO x C BD ma Ore 6 Next solder the two large red 33nf hm ny aren SB is E capacitors in the positions shown f at s emen i am January 2nd 2015 www thonk co uk Music Thing Modular Eurorack DIY Kit Version 0 91 V Spring Reverb Module Instructions l Take the protective pink ESD bag with yellow sticker out of the main bag and find the 2N3904 transistor The middle lead needs to be bent slightly towards the semi circular face of the transistor body the component should sit in a tripod configuration ea i on the three leads p J tot bs Pees tr ITTV TOT NOTE Do not
12. ds of the wires with a small amount of solder You need to do this neatly particularly the end that solders to the PCB or it won t fit through the holes The wires shown in yellow go from RTN_TIP and SND_TIP on the PCB to holes at the tip of the main body of the RCA jacks The wires shown in blue go from RTN_RNG and SND_RNG on the PCB to the grounding rings January 2nd 2015 www thonk co uk 18 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions 37 The module is now complete Affix the power cable as shown with the red stripe down 38 The trimming and calibration process is detailed in the Music Thing Modular documentation linked below if you don t follow it you can easily end up with a distorted reverb sound It also contains excellent instructions for general use a guide to selecting spring tanks and ideas for further modifications and expansion http musicthing co uk modular wp content uploads 2013 10 Spring_2_1_Documentation pdf January 2nd 2015 www thonk co uk 19
13. the two boards are connected together NOTE Don t push them so far apart that the leads touch the RCA socket connections January 2nd 2015 www thonk co uk 15 Music Thing Modular Spring Reverb Module wth 33 It s time to join the two PCB s together as shown mating with the male and female 5 pin headers in the centre of each board Use the two remaining small machine screws to secure the brass hex spacers NOTE Again make sure you don t use the two longer screws for the front panel or it ll be a boring job taking it all apart again later on NOTE Remember to take care of the exposed LED it bends easily 34 Put the three plastic washers back on the pots and fully and finally affix the front panel 3 nuts on the pots and 4 nuts on the 3 5mm jacks sockets NOTE Leave the knobs off until the module is fully tested January 2nd 2015 Eurorack DIY Kit Instructions Version 0 91 we we eu oe i gt Ma pn sh A ren N WAVY WM Rages PEro ad A e f BPT te OS YE www thonk co uk 16 Music Thing Modular Eurorack DIY Kit Version 0 91 m4 Spring Reverb Module Instructions 35 If you have the Front panel with RCA connections you need to follow these steps otherwise skip to section 37 If you have the panel with the RCA jacks on the front then fix them now The washers go on the front and the grounding tags and nuts go on the back
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