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MIDI THING V1 - ASSEMBLY GUIDE
THANKS FOR CHOOSING ONE OF OUR KITS!
This assembly guide has been designed taking into account the common issues that we
often find people experience in our workshops. The order in which the components are
placed on the board is meant to make assembly as easy as possible.
Some steps are not obvious, so even if you're an experienced DIYer, please take the
time to read the steps thoroughly before starting.
If this is your first project, please read this article before you start assembling the
kit:
www.befaco.org/howto/
GOOD LUCK!
MAIN PCB (The small one)
OPEN MAIN BOARD BAG A
RESISTORS
Qty Value Code Name on PCB
4 1k Brown, black, black, brown, brown R5, R11, R13, R14
4 47k Yellow, violet, black, red, brown R2, R4, R6, R16
4 68k Blue, gray, black, red, brown R1, R3, R12, R15
3 4K7 Yellow, violet, black, brown, brown R9, R10, R19
2 10k Brown, black, black, red, brown R8, R17
1 5k6 Green, blue, black, brown, brown R7
1 270 Red, purple, black black, brown R18
DIODES
Solder the diodes observing their polarity. The black or white line on the diode must
match with the white line on the diode symbol on the PCB silkscreen.
Qty Value Name on PCB
1 1N4148 D9 (orange)
2 1N5817 D10, D11 (black)
FERRITES
Solder the two ferrite beads by using a recycled resistor leg passed through each
ferrite and proceed as if it were a resistor. Ferrite beads don't have polarity.
The space for the ferrites is a bit tight. You can either leave some slack in the
leads or leave them until after you have fitted the power connector.
Qty Name on PCB
2 F1, F2
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MIDI THING V1 - ASSEMBLY GUIDE
INDUCTOR
Looks like a large, bulbous resistor. No polarity.
Qty Value Name on PCB
1 22uH L1
CRYSTAL OSCILLATOR
Oval component with a metallic finish. This component does not have polarity.
Qty Value Name on PCB
1 16MHz Q1
OPEN INTEGRATED CIRCUITS BAG
ICs
First place the sockets (taking care to orientate them properly – the notch or dot on
one end of the IC should match the image on the silkscreen) and solder them into
their correct positions.
Next place the ICs in their respective sockets (again taking note of their
orientation – the notch or dot on the top of the IC must match that of the socket and
silkscreen).
Qty Value Name on PCB
1 6N138 OK1
1 Atmega IC3
2 LF412 IC1, IC2
1 4504 IC4
OPEN MAIN BOARD BAG B
CAPACITORS
Identifying capacitors can be quite tricky. Codes stated are indicative, please take
a look at this guide for help identifying capacitors: http://www.wikihow.com/Read-a-
Capacitor
Qty Value Code Name on PCB
8 100n 104 C1, C5, C6, C8, C9, C12, C14, C15
6 22p 22p C2, C3, C4, C7, C10, C11
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MIDI THING V1 - ASSEMBLY GUIDE
REGULATOR
Make sure it is positioned correctly with reference to the silkscreen outline on the
PCB
Qty Code Name on PCB
1 78L05 REG
ELECTROLYTIC CAPACITORS
Values are written on the side of the capacitor. Mind their polarity (The long leg of
the capacitor is the positive (+)).
Qty Value Code Name on PCB
3 10uf 10uf C13, C16, C17
MALE PIN HEADERS
Place and solder the Three Male Pin Headers over the silkscreen (caution: the 2x3
header is soldered on the reverse side of the PCB to the components you have
soldered) at “JP1”, “JP2” and “ICSP”. It is the shorter pins that you are soldering.
JP102 is an expansion port that is not currently use. There is no need to solder pins
here.
POWER CONNECTOR
Solder the power connector at EPOWER, ensuring the position is correct: it must be
placed over the silkscreen marking with the pins facing the edge of the PCB.
CONTROL PCB
OPEN CONTROL BOARD BAG B
RESISTORS
Qty Value Code Name on PCB
6 1k Brown, black, black, brown, brown R102, R104, R106, R107, R109, R111
6 10k Brown, black, black, red, brown R101, R103, R105, R108, R110, R112
2 300 Orange, black, black, black, brown R114, R113
1 220 Red, red, black, black, brown R100
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MIDI THING V1 - ASSEMBLY GUIDE
FEMALE PIN HEADERS
Place the two female pin headers “JP100”& “JP101” and solder them where the
silkscreen indicates.
SPACER
Secure the spacer onto the Control PCB (through the hole with silver outline) with
the main body of the spacer on the component side, and the nut on the opposite.
FRONT PANEL COMPONENTS MOUNTING TIPS:
Now we will proceed to mount the jacks, potentiometers, switches and LEDs. This part of
the assembly is CRITICAL. Please take your time and read the following instructions
carefully.
These components must NOT be soldered until they are placed on the PCB and fully
attached to the front panel.
There are two reasons for this:
• The height of the panel components are not all the same. Because of this, if not
attached properly before soldering, they will not stay properly seated against
the panel. This might cause mechanical stress reducing their life expectancy and
in the worst case cause them to break.
• The second reason is that it is very difficult to align the components to the
holes if the panel is not positioned prior to soldering. In the case of the LEDs,
they are almost impossible to set to the correct height without reference to the
front panel.
LEDs
Place the LEDs onto the PCB minding, their polarity, but don't solder them until the
front panel is in place. This is the only way to solder them in the right position.
The long leg is the positive and the short the negative. On the PCB the square pad
indicates the negative side and there is a + symbol to indicate the positive.
Qty Name on PCB
8 D1, D2, D3, D4, D5, D6, D7, D8
MINI-JACKS
Place all the mini-jacks onto the PCB ensuring they are on the silkscreen side, but
don't solder yet.
Caution: the switch nut and the jack nuts look the same, but they are not equally
sized and will not fit in each others' thread, so make sure to keep them separate!
PUSH BUTTON
Place the push button on the PCB where the silkscreen indicates but don't solder
it yet.
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MIDI THING V1 - ASSEMBLY GUIDE
FRONT PANEL
Attach the front panel adjusting the parts one by one if necessary until they fit. At
this point a pair of fine tweezers can be helpful.
To finish:
- Secure the parts to the panel in this order: A) Mini-jacks B) Push button.
- Ensuring all of the above parts are flush with the panel then you can finally
solder them!
WARNING: Do not forget to cut the legs of the push button switch and MIDI connector
legs after soldering as they might touch components on the main board and damage the
module.
- Next, adjust the LEDs so that they are flush with the panel and solder them.
- Place the MIDI connector through the front of the panel and solder in place. Cut
the legs flat, the power connector might not properly fit once module is assembled.
- Connect the main PCB to the control PCB using the pin headers and ensuring the 3mm
hole match the spacer. Screw both boards using the screw.
- Connect the power ribbon cable: The red wire (-12V) on the power ribbon cable
corresponds to pin number one on the male power connector. The number one pin is
indicated with a small triangle on the male power connector and a white line on the
main PCB. A white or black line (or “-12v”) marked on your power bus normally
indicates the corresponding pin.
ENJOY YOUR NEW BEFACO MODULE!
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