Thonk Music Thing Modular SimpleEQ Instructions d'utilisation
Music Thing Modular
SimpleEQ
Construction Guide
(1206 version)
MTM SimpleEQ 1206 build doc v1.3 Page 1
seful Links
The latest version o this doc and BOM can always be ound at http://thonk.co.uk/documents/eq/
A build thread on the Mu wiggler DIY orum can be ound at this URL
Quickstart
I you're new to building with SMD components, skip to the detailed notes on the next page.
I you're an experienced SMD builder you'll probably want to skip the lengthy notes below, so
here's some things that will probably save you time when you're building this project.
•A detailed BOM can be ound on the last page o this document.
•The op-amps might not have pin 1 indicated by an adjacent dimple/dot in the package, or by
a semi-circular indentation at the end nearest pin 1/pin 8, as is common with through hole
ICs. SMD devices o ten have one o the longer sides with a sloped edge, the other with a
vertical edge. I you have such a device, pin 1 is the le t-most pin o the side with the sloped
ace when the device is pointing upwards. The silk screen on the PCB shows both the
traditional circle next to pin 1 and also a line to indicate the orientation or devices with a
sloped ace. There are pictures on page 19 that show this.
•The suggested build order is to start with the components that have the lowest pro ile &
work upwards, so thats
◦resistors
◦non-polarised capacitors
◦diodes & PTC uses
◦ICs
◦electrolytic capacitors
◦through hole components and panel
•It's suggested that you regularly stop to clean and inspect your work. It's much easier to re-
solder a joint when the board doesn't have the jacks and pots itted.
MTM SimpleEQ 1206 build doc v1.3 Page 2
Recommended Tools
To work with sur ace mount devices, such as those used in this kit, it's a good idea to have the
ollowing tools to hand:
•Soldering iron with a small tip. A 1-2mm chisel or point tip is pre erable.
•Fine gauge solder. Ideally 0.7mm or less.
•Solder wick. This is essential or removing excess solder, especially when soldering the ICs.
•Flux pen. This isn't essential or a kit like this with only two 8-pin IC's, but it does make
soldering some components easier.
•Fine point tweezers. These are essential or handling sur ace mount components.
•Magni ying glass or jewellers Loupe. You'll need some method o inspecting solder joints.
Magni ication o 10x is recommended.
•So t haired brush and PCB cleaner or removing lux residue. The type o cleaner will
depend the on the solder you use. Isopropyl alcohol usually works well.
MTM SimpleEQ 1206 build doc v1.3 Page 3
Introduction to working with Surface Mount
Components
This section isn't meant to be a de initive guide to working with sur ace mount technologies. You'll
ind plenty o tutorials online or that. This is intended to provide some tips as to how to approach
building this kit.
Many sur ace mount components are supplied in tape packaging. For passive components such as
resistors and capacitors, the tape is usually made o cardboard, whilst semiconductors, such as ICs,
transistors, diodes etc will be in a anti-ESD plastic. The tape will probably have a layer o clear
plastic ilm over one side. To remove the device, the easiest way is to care ully peel away the plastic
ilm with a pair o tweezers or ine nosed pliers. Take care when you remove this ilm. These
components are small, and it's easy to lose them i you jolt the tape once the ilm is removed. It's a
good idea to remove them rom the packaging & place them into a bowl or other similarly shaped
container, then pick them rom there as you place them onto the PCB.
MTM SimpleEQ 1206 build doc v1.3 Page 4
Illustration 1: SMD resistors supplied in tape
MTM SimpleEQ 1206 build doc v1.3 Page 5
Illustration 2: SMD resistors in tape showing plastic cover partially peeled away
Illustration 3: SMD IC's in tape packaging
Install one component type & value at a time. Many o these components are not labelled with their
values, so don't mix them up. Finish one component type & value be ore proceeding to the next.
Don't rush. Regularly inspect your work with the magni ying glass or loupe. Clean your work as
you go. You'll ind it much easier to inspect your work with the solder lux residue removed.
There's many use ul resources online or tutorials on working with sur ace mount devices. The
techniques here suggested here are one way to solder sur ace mount devices. As you become more
amiliar with working with this technology, you may ind other ways o working that you pre er.
So, to the kit ...
MTM SimpleEQ 1206 build doc v1.3 Page 6
The Kit
The PCB:
MTM SimpleEQ 1206 build doc v1.3 Page 7
Illustration 5: CB top view
Illustration 6: CB bottom view
Illustration 4: SimpleEQ 1206 kit with white panel
The Build
We'll start with the resistors.
Find the bag that's marked “10K x4 R1 R2 R3 R4” & remove the component tape strip containing
the our resistors. As described above, open up the tape strip by removing the clear ilm cover,
tipping it's contents into a suitable container. One side will probably be a darker colour than the
other. The darker side may be marked with the components value. In the image below it's “1002”
(100 x 102 or 10,000 or 10K), though you may also see 10K marked with “103” (10 x 103). Whilst it
doesn't matter which side o the component you have acing upwards, it's good practice to have the
side with the value pointing upwards. As resistors are not polarised it doesn't matter which end o
the resistor is soldered to which pad on the PCB.
Be ore we actually solder the irst o the resistors, lets take some time to actually see how the
resistor will be located on the PCB. Place the PCB on a lat sur ace. Find the location o the irst o
the 10K resistors, R1. It's over towards one side o the board. Notice that the PCB has 2 pads or the
component, and two white silk screen lines between the pads.
MTM SimpleEQ 1206 build doc v1.3 Page 8
Illustration 8: 10K SMD resistor top view
showing the value “1002”. Illustration 7: SMD resistor bottom view
Illustration 9: SMD resistor pads and silk screen on CB (showing R1)
Pick up one o the resistors using the tweezers, & place the ends o the resistor centrally over the
two pads. Notice how much clearance you have around the outside o the resistor on the pads.
When you solder the resistor in place, you'll want to get similar clearance.
Using the tweezers, place the resistor back in the bowl.
Place the tip o your soldering iron on one o the PCB pads or R1, & immediately apply a small
amount o solder to the pad. Remove the iron tip. You should have a small rounded blob o solder
on the pad.
I you think you've applied too much solder to the pad, you can remove this with solder wick. Place
the wick on top o the blob o solder, apply the tip o the soldering iron brie ly. The wick will soak
up the solder. The wick will probably remove almost all the solder so you'll need to re-apply a small
amount.
MTM SimpleEQ 1206 build doc v1.3 Page 9
Illustration 10: SMD resistor located centrally on pads
Take one o the resistors in the tweezers, ensuring the side o the resistor with the value marking is
pointing upwards. Re-apply the soldering iron tip to the pad with the solder on it, & quickly slide
one side o the resistor onto the pad, so that the edge o the resistor is lined up on the middle o the
pad, and the resistor is approximately covering equal parts o both pads, as you practiced
previously. Quickly remove the soldering iron tip.
I the resistor is not placed correctly, re-apply the tip o the soldering iron to the pad & the edge o
the resistor & use the tweezers to align the resistor. Remove the iron tip. Try to do this as quickly as
possible. It's much easier to move the resistor with just one pad soldered, so now is the time to get
it's positioning right.
You might think that there isn't a lot o solder on the pad. This is ine, extra will be added once the
other pad is soldered. The component is ixed irmly in place by the solder that is on there.
Now solder the other pad. Place the soldering iron tip on the R1 pad that you didn't solder, resting
the end o the tip up against the side o the resistor, then immediately apply a small amount o
solder to the contact point o the soldering iron tip, the pad & the resistor. The solder will low over
the pad & into the gap between the resistor & the pad. Remove the soldering iron tip. The whole
action should take no more than a couple o seconds.
The resistor should now be located on top o the pads in a similar position to how you practised
earlier.
MTM SimpleEQ 1206 build doc v1.3 Page 10
Illustration 11: resistor soldered to one pad
Table des matières
Autres manuels Thonk Synthétiseur
