I2 Assembly instructions (v.2)
PCB1: COMPONENTS
Resistors:
#
Value
Code
1
1k
Brown, black, red
6
4k3
Yellow, orange, red
2
5k6
Green, blue, red
R16
R1, R3, R5, R9, R17, R18
R7, R51
16
10k
Brown, black, orange
R6, R8, R10, R21, R22, R26, R32, R33, R34, R36,
R40, R41, R44, R45, R49, R52
1
18k
Brown, grey, orange
R13
4
20k
Red, black, orange
R20, R25, R42, R47
1
36k
Orange, blue, orange
R14
1
56k
Blue, green, black, red
R24
10
100k
Brown, black, Yellow
R11, R15, R19, R29, R30, R31, R37, R38, R43,
R50
2
130k
Brown, orange, wellow
R28, R48
2
180k
Brown, grey, yellow
R35, R39
2
300k
4
1M
Red, black,black, orange R27, R46
Brown, black, green
R2, R4, R12, R23
Solder the diodes ( D1, D2, D3, D4, D5, D6) respecting polarity. Black line on the diode
must be in the same place as white line on the diode PCB silkscreen.
Solder the two ferrite beads (FERRITE+, FERRITE-) passing trough a recycled resistor leg
Place the sockets (IC1, IC2, IC3) and solder them. Then place the ICs on them taking
care of polarity. To do that the mark on front must match the mark on the socket.
IC1=TL074, IC2=TL074, IC3=TL072.
Place and solder the Female Pin Headers at the top side of the board (silkscreen),
ensuring it is 90º from PCB.
CAPACITORS
#
Value
Code
1
1n
102
C2
2
2n2
222
C4, C5 (Poliester)
1
10n
103
C10 (Poliester)
1
22n
22n
C101
12
100n
104
C3, C6, C9, C11, C13, C14, C15, C16, C17, C18, C21, C22
1
150n
15k
C7
(Poliester)
1
220n
220n
C1
(Poliester)
1
1uf
1J63
C8
ELECTROLITIC CAPACITORS
Values written at the side of the capacitor. Mind polarity. Check positive terminal on board and make it match with long leg.
2
10uf
C19, C20
1
100uf C12
Solder the transistors 2n3906 (Q2, Q4, Q5, Q6, Q8, Q9) and 2n3904 (Q1, Q3, Q7). Be sure
they are on proper position (same as the silkscreen on the PCB)
Solder the power connector being sure the position is correct (as in the silkscreen)
Leave Jack connector for the end.
PCB2 : Control
Resistors:
#
Value
Code
Name on PCB
2
39
Orange, white black
5
1k
Brown, black, red
1
10k
Brown, black, orange
R105, R107
R100, R102, R103, R104, R106
R101
Solder the diodes ( D100, D101, D102) respecting polarity. Black line on the diode must
be in the same place as white line on the diode PCB silkscreen.
Capacitors:
#
Value
Code
Name on PCB
1
100n
1J
C100 (Poliester)
1
4,7 uf
Long leg positive
C102
2
100 uF
Long leg positive
C103, C104
Place and solder the Male Pin Headers at the top side of the board (silkscreen),
ensuring it is 90º from PCB.
Solder the toggle switch.
Solder the minijack or the Banana(AUDIO_OUT,ENVELOPE_OUT,ENV_REGEN,GATE,INPUT,TRIGGER).
Put LEDs on place. LED_ENV, LED_REG are bi-colo leds while GATE_LED, TRIGGER_LED are red
Leds respecting the polarity but don't solder them until you screw the front panel.
This way it's easier to solder them on the right position.
Place potentiometers on place but don't solder them. ATTACK, DECAY, GAIN, THRESHOLD
are 100k (Rounded shape). FREQ, WIDTH are 10k double pots (square shape)
Put the spacer on the holes by the male side and fix them with nuts.
Place the front panel, screw the minijacks or bananas and the switch. Make sure LEDs are
on the right level and poceed to solder LEDs and potentiometer.
Place Jack connector to PCB1
but don't solder it. Leave the connector slightly out.
Assembly the PCB1 on the PCB2 and screw the jack connector to the panel. Make sure it
does not take the connector from the board. Then solder the jack connector.
Screw both boards using the spacers with provided screws.
Acknowledgments and information.
A big bunch of Kudos to Juan Bermudez. For providing schematics, ideas, support and wisdom.
Please visit our site for updated information about this module:
http://www.befaco.org/en/instrument-interface/
This design is under the Creative comons attribution-Share alike licence, that allows to copy, adapt or distribute the material by any media or format
as long as you mention the source. The result of a copy or adaptation has to be licensed in the same way.