Euro-ADSR v1.2 – Assembly Guide
Thank you for purchasing this module! This is a reasonably simple build with a small number of
components.
The module is designed and sized for Eurorack systems. You will need a 16-10 pin eurorack power
ribbon connector with –12/0/+12 which is connected to a synth power supply.
Follow the parts lists, these instructions and the PCB silkscreen text to build the module.
The module consists of 1 PCB board and a front panel.
You may need to clean up the board edges with wire cutters and/or a file to remove the remains of
the tabs from the fabrication process. This is particularly important for the edges containing the
jacks. These edges will need to mate flush with the front panel.
You must follow the order of assembly as described below.
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Constructing the board
1. Clean board edges with wire cutters and/or file to remove the manufacturing tabs.
2. Resistors
Install the flat resistors on the TOP of the board. Solder and clip the leads.
3. Diode (not LED)
Install the diode (but not the LED) on the TOP of the board. These are polarized components.
Align the stripe on the diode with the stripe marked on the board. Solder and clip the leads.
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4. IC Sockets
Install the IC sockets. Observe the notch or mark on the sockets and align with the notch or
mark on the board. Solder.
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5. Power socket
Install the 10 pin power socket on the TOP of the board. The socket should be installed with the
notch facing outwards from the board as shown in the photo. Solder.
6. Ceramic/film/polystyrene capacitors
Install the ceramic/film capacitors. Solder and clip the leads.
7. Tantalum capacitors
Make sure you orient these capacitors correctly. The longer lead and/or the lead marked with a
+ needs to be inserted into the hole that has the “+” marking near it. Leads marked with “-“ go
in the board hole WITHOUT the “+”. Solder and clip the leads.
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8. Trimmer resistors
Now populate the trimmer pots on the PCB. Make sure they are oriented so that the screw is
above the circle on the silk screen.
9. Potentiometers
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If the pots have positioning lugs on the front, cut these off with a sharp pair of flush cutting
pliers. The front of the pot (where the shaft prtrudes) needs to be flat.
Pots VR1, 2 and 4 are 1M, pot VR3 is 100k. Follow the markings on your actual board, they may
be different to the ones shown in the photos.
Tack one pin only with a small amount of solder. These will be finalized later. Please ensure
they are on the CORRECT SIDE OF THE BOARD. See Photo.
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10. 3.5mm Jack Sockets
Install jacks. Tack one pin only with solder. These will be finalized later. Please ensure they are
on the CORRECT SIDE OF THE BOARD. See Photo.
11. Alignment
1. Place a washer over each pot shaft.
2. Place the front panel over the board so that the pots and 3.5mm jacks align with the holes in
the panel.
3. Put nuts on the jacks and pots and FULLY TIGTEN all of them. Do not overtighten!
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4. Now fully solder all the pins of each jack and pot.
12. LED
Bend the pins of the LED as shown in the photo. The bend is at 6mm (1/4") from the underside
of the LED. Note the location of the longest lead as shown in the photo.
Install the LED loosely on the top of the board. Place the anode (longer lead) into the pad with
the ‘+’ marking next to it.
Place the panel over the jacks and pots and position the LED in the hole. Solder and clip the
leads.
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13. Do not install the ICs until the voltage tests are complete.
14. If you do not trust all your soldering and connections, carry out the voltage tests below before
installing the ICs
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Voltage tests
1. You do not have to do these tests if you are completely happy with your soldering and are sure
there are no bridges or incorrectly placed components. However, these tests will ensure that
the correct power supplies are sent to the IC pins to ensure they will not be damaged on power
up.
2. Plug in the power supply and connect the –VE probe of a multimeter (set to the 20V DC range)
to one of the GROUND pins of the jacks. The GROUND pin is nearest to the edge of the board.
3. Check the voltage at the following points on the board:
a. At IC1 pin 4 approx = +12V
b. At IC1 pin 11 approx = -12V
c. At IC2 pin 16 approx = +12V
d. At IC2 pin 6, 8 = 0V
e. At IC2 pin 13 approx = +12V
f. At IC3 pin 14 approx = +12V
g. At IC3 pin 3, 5, 7, 11 = 0V
4. If any of these tests fail to match the readings given, you should check the components and
soldering before progressing
Final Assembly
1. Place the ICs in place by aligning the notch with the notch graphic on the PCB Silk Screen and
notch on the sockets.
2. Place a washer over each pot shaft.
3. Place the front panel over the board so that the LED, pots and 3.5mm jacks align with the holes
in the panel.
4. Put nuts on the pots and jacks and fully tighten.
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5. Install the knobs.
6. NOW READ THE USER GUIDE.
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