ElectroSmash pedalSHIELD UNO Manual

www.electrosmash.com/pedalshield-uno
How to Build pedalSHIELD UNO
This is a 5 steps guide to build pedalSHIELD UNO. With all the materials on hand it takes around -3
hours to build it successfully. Take your time to double check every step and enjoy!
Step 0 – Prepare the Materials.
You need a solder iron, lead and cutting pliers. Additionally cutter, scissors and pliers are convenient.
The PCB has solder mask and plated holes, so it is easy to solder with any 15-30W cheap solder iron.
Keep in short hand the PCB plan and the Bill of Materials:
Refere ce Value
C ,C5, C7, C8, C9 5 6.8n
C3, C6, C10 3 4.7u
C1, C11 100n
C4 1 70p
R1 ,R13, R10, R9, R6, R4, R3 7 4.7K
R5, R7, R8 3 100K
R1, R 1M
R11 1 1M
RV1 1 500K
D1 1 Led 3mm blue
U1 1
socket 1 dip 8 socket
SW1 1
SW 1 Toggle switch
SW3, SW4
Conn1, ,3,4 1 40 pin header
J1, J 1/4 Jack audio
Qty
Capacitors & &
Resistors&&&&
Others&&&&&
TL97 pdip-8
3DPT footswitch
Pushbutton

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Step 1 – Solderi g Resistors.
There are 13 resistors to be placed:
•Solder the 4.7KΩ resistors (7 units): R3, R4, R6, R9, R10, R1 , R13.
•Solder the 100KΩ resistors (3 units): R5, R7, R8.
•Solder the 1M resistors ( units): R1, R .
•Solder the 1. M resistor: R11.
tips:
- In order to solder the components, bend the leads close to the
body, introduce them in the footprint and once soldered cut the
excess of lead as short as possible to avoid short circuits.
There is a nice video on Youtube to learn how to solder from
scratch.

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Step 2 – Solderi g the Capacitors.
There are 8 film/ceramic and 3 electrolytic caps.
•Solder the 6.8nF capacitors (5 units): C ,C5, C7, C8, C9.
•Solder the 4.7uF capacitors (3 units): C3, C6, C10.
•Solder the 100nF capacitors ( units): C1, C11.
•Solder the 70pF capacitor: C4.
tips:
–Be careful with the electrolytic caps polarity, the negative lead (the short one) has to be placed in
the round hole with the white semicircular paint. The positive hole is always square-shaped
(zoom the above image to be sure).

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Step 3 – Medium Size Compo e ts.
The last components to be placed are the dip sockets, resistor trimmer, and led:
tips:
Take care with the LED D1 soldering: present the plastic cover to size the length of the leads. The short
lead (cathode) it is marked with a “K” on the PCB and goes to the flat side of the diode mark.

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Step 4 – Solderi g the Big Compo e ts.
The last components to be placed are the push-buttons ( ), toggle switch (1), 3PDT Foot-switch (1) and
jack connectors ( ) and the pin stripes:
tips:
- When soldering the potentiometers and switches it would be good to check their positioning against
the plastic cover. The cover will fit better if the cover its aligned.
- Be careful soldering the big components perpendicularly because they tend to be slightly tilted.
- The 40 pin stripe has to be cut in 4 segments
of 6 pins, 8 pins, 8 pins and 10 pins each.
You can use a cutter to carve a groove and then
just bend it carefully to break it. Wire-cutters
also work fine.
-The USB
connector is too
close to the output
jack, to avoid short
circuits isolate the
USB jack with some
duck tape.

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Step 5 – Checki g Out the Job Do e.
After this 5 stages you will have a mounted board exactly like the one shown below:
Double check your PCB with the model component by component.
Before power it up, check this 3 ticks:
1. Visual inspection of the PCB bottom, there is no short circuits or long ☑uncut leads.
. The polarized components are placed correctly: the diode and electrolytic caps.☑
3. The op-amp is placed right (not upside down).☑
If you need more help there is a topic in the forum called Guide to troubleshoot pedalSHIELD UNO .
Finally the plastic cover can be placed, it is kept in
placed by the foot-switch nut and plastic washer,
simple and neat.