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October 25

th

 2013 

www.thonk.co.uk 

15 

Music Thing Modular 
Spring Reverb Module 

Eurorack DIY Kit 

Instructions 

Version 0.9 

 
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. 
 
Now  fit  the  two  remaining  TL072CP 
ICs. 
 
Make  sure  the  circle  on  the  top  face 
of the ICs are both at the end with the 
notch in the IC socket. 
 
 
 
 
 
 
 
 
 

 
 

 

 
NOTE!  This  spacer  may  cause  the 
C2 Electro Capacitor to lean over but 
this  shouldn’t  cause  a  problem. 
 
 

 

 
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  the  two  boards  are 
connected together. 
 

NOTE!

  Don’t  push  them  so  far  apart 

that  the  leads  touch  the  RCA  socket 
connections. 

 

 

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 

Notch 

Notch 

Circle 

Circle 

Summary of Contents for Spring Reverb

Page 1: ...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 I_NU2ruzyc4 and the Adafruit g...

Page 2: ...ook 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...

Page 3: ...itors 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 2 Start with the front PCB as pictur...

Page 4: ...lder 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 Ne...

Page 5: ...text marking it looks identical NOTE Do not heat this part excessively or you will damage it you should be aiming to solder quickly and neatly 8 Next take the Vactrol from the Main Bag and solder into...

Page 6: ...der the 4 remaining vertically positioned resistors 10K x1 47K x2 100K x1 Solder each pair of vertical resistors so they are in a mirrored configuration This removes the chance of them hitting each ot...

Page 7: ...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...

Page 8: ...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...

Page 9: ...w 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...

Page 10: ...rd slightly Do this with a pair of pliers or If you re careful you can bend each row manually on the top of table The pins ideally should be perpendicular to the body of the IC Fit the IC s in the pos...

Page 11: ...der 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 22 Solder the remaining four 100n capacitors originally on the cardboar...

Page 12: ...E 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 wi...

Page 13: ...ilkscreen 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 heade...

Page 14: ...as shown 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 thes...

Page 15: ...two remaining TL072CP ICs Make sure the circle on the top face of the ICs are both at the end with the notch in the IC socket NOTE This spacer may cause the C2 Electro Capacitor to lean over but this...

Page 16: ...anel 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 a...

Page 17: ...osition where they can touch the aluminium rail in your synth case Don t let the grounding ring rotate below this dotted line Leave a gap Don t let the grounding ring touch the jack socket body There...

Page 18: ...ist and tin the ends 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 f...

Page 19: ...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 ex...

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