Thonk AT-AT-AT Manual

AT-AT-AT
Eurorack DIY Kit Instructions
Page 1
AT-AT-AT Triple Passive Attenuator
OVERVIEW
For the most recent version of this
document please visit
https://www.thonk.co.uk/shop/at-at-at/
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 https://youtu.be/IpkkfK937mU and the Adafruit
guide to excellent soldering –bit.ly/1l77tF4
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/1jxqF3n
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AT-AT-AT
Eurorack DIY Kit Instructions
Page 2
SOLDER JOINTS
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.
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/
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AT-AT-AT
Eurorack DIY Kit Instructions
Page 3
AT-AT-AT BUILD INSTRUCTIONS
1.
Start by finding the single 10-pin
header and break this into three
separate 3-pin headers.
Place and solder each header so they
sit on the back of the PCB in the
LIN/LOG positions as shown.
TIP: Solder 1 pin of each header first,
then check that the header is sitting
flush to the PCB surface. You can
reflow the joint while pushing the
header flat if needed before moving on
to solder the rest of the pins.
2.
Next turn the PCB over and solder the
three 10K resistors into the positions
marked R1, R2, and R3 on the PCB
(all resistors are the same value).
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Eurorack DIY Kit Instructions
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3.
For the next step place the three
B100K pots and six jack sockets into
position as shown but DON’T
SOLDER ANYTHING YET.
4.
Place the panel on the front of the
module and then add the nuts and
washers to all pots and jacks to hold
everything in place.
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AT-AT-AT
Eurorack DIY Kit Instructions
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5.
Check the components are sitting flush
between the panel and PCB, and then
flip the module over and solder all the
pins for the pots and jacks on the back of
the PCB.
6.
Finally attach the knobs onto the pots
and the three red jumpers onto the
headers on the back of the PCB.
Before attaching the knobs, be sure to
turn the pots fully counterclockwise and
line the knob pointer with the notch on
the panel before pushing on firmly.
Place the red jumpers in the LIN position
as shown if you’re attenuating CV
signals, or the LOG position if you’re
mainly attenuating audio signals.
7.
The module is now complete and ready
to mount in the rack (this module doesn’t
require any power).
April 2022 Version 2.0