en:carte_electronique_composants_et_montage [SVXLink Card]

The electronic card diagram is available as a PDF file. It is recommended to print it on a paper format A3.

Diagram SVXLINK-RASP2015.pdf

<note>You will find here the definition of the protype board version 1.0 </note>

Quantity	Ref of Components	Value
2	C1,C3	220µF electrolytic 16V
8	C4,C5,C6,C7,C8,C9,C10,C11	10µF tantale 25V (106)
12	C2 (¹),C12,C13,C14,C15,C16,C18,C19,C20,C21,C22,C23	0,1µF/ 100nF tantale (104)
1	C17	1µF tantale (105)
2	D1,D2 (¹)	1N5817, or 1N5820 (¹)
2	D3,D4	LED red
6	D5,D6,D13,D14,D15,D16	LED green
2	D7,D8	10BQ015 (SMD) or 1N5819
4	D9,D10,D11,D12	1N4148
2	IC1,IC8	ULN2003
1	IC2	DS18B20
2	IC3,IC6	CNY74-4
1	IC4	MAX3232
1	IC5	MAX6369
1	IC7	MCP3204
1	J1	Connector 40 Raspberry Pi B+/2B
4	J4,J8,J12,J14	Jack 3,5mm
3	J2,J6,J10	RJ 12 : TX RPTER, RX RPTER, LINK
1	J16	Connector-DC-2.1mm
4	K1,K2,K3,K4	RZ03-1C4-D012
1 (¹)	L1 (¹)	330 µH - 1 A PIS4728 (¹)
14	R1,R2,R3,R4,R5,R6,R7,R8,R41,R42,R43,R44,R45,R48	470 1/4W
4	R9,R11,R13,R16	1K 1/4W
4	R33,R34,R35,R36	To be defined according to measurement i.e. 220 Ohms 1/4W (For 5V inputs 5V)
9	R10,R12,R22,R37,R38,R39,R40,R46,R47	10K 1/4W
2	R14,R17	1K linear potentiometer
2	R15,R18	10K linear potentiometer
3	R19,R20,R21	4,7K 1/4W
2	R23,R24	10 1/4W
8	R25,R26,R27,R28,R29,R30,R31,R32	0K 1/4W ( jumpers if you don't use audio transformer )
4	Tr1,Tr2,Tr3,Tr4	ETAL P1200
1 (¹)	X1 (¹)	LM2575T-5 (¹)
1	X2	KIM-055L
1	F1	Fuse TR5 2A
4	OTHERS	Spacers 10mm M3 female/female + screw M3
1	OTHERS	Breakable Connectors HE14 step of 2,54mm right 1×36

<note>(¹) Component not to be used when X2 KIM-055L is choosen for 5V power supply:

C2,
D2,
L1,
X1 (LM2575T-5)

</note>

The PCB of the SVXLink Card

Step by step assembly description

Power supply with module KIM-055L

The components list to be installed :

X2 5V Transformater KIM055
Connector DC 2,1mm J16 or J17 Screw terminal.
Diode D1 1N5820
C1 and C3 capacitor 220μF 16V
Fuse F1 TR5 2A
2X Breakable Connectors HE14 step of 2,54mm right 1×2

Test of the 5V output voltage

PTT/SQUELCH assemby section

The components list to be installed:

IC8 ULN2003
IC3 CNY74-4
R1 to R8, R45, R48 470 Ω
R9, R11 1 kΩ
R10, R12, R46, R47 10 kΩ
D3, D4 Led red 3mm (with + on resistor side, the longer leg)
D5, D6 Led green 3mm (with + on resistor side, the longer leg)
D7, D8 Diodes 10BQ015
2X Breakable Connectors HE14 step of 2,54mm right 2×2

The components list to be installed:

C4 à C11 Capacitor 10μF
R13 and R16 1 kΩ
R14 and R17 Potentiometer 1 kΩ
R15 and R18 Potentiometer 10 kΩ
J4,J8,J12,J14 Connector jack 3,5mm (It is possible to install PIN to solder J5,J9,J13,J15).
TR1 to TR4 Isolation Transformer ETAL P1200 (There is a possible alternative see above picture).
J2,J6,J10 Connector RJ12 or PINs to solder

<note tip>For the minimum version of the card, the assembly is at this step termined. We are going to follow by assembling the optional parts. The Raspberry Pi 2x20 pins connector will be weld in the last part. If you use the repeater version without using a Link, this part, may not be assembled. </note>

The components list to be installed:

R33 to R36 220 Ω (This value can be changed according to the input voltage. Here it's for 5V)
J26 connector 2×5 pins
IC6 CNY74-4
R37 to R40 10 kΩ

The components list to be installed:

IC5 MAX6369
R22 Resistor 10K
C14 Capacitor 0,1μF
PIN 2×1 Weld the 2 connectors. One is useful to activate the Watchdog and the other (RUN) to connect the RUN or P6 connector of release (Reset) of the Raspberry Pi. SET0 SET1 SET2 are jumpers (solder) to determine the time before reset if it does not send a signal.

A Watchdog “MAX6369” is a standalone CI. If the component does not receive a voltage pulse (System crash) in a defined period, it will reset the system.

Datasheet:MAX6369-MAX6374.pdf

As boot starting time exceeds 10 seconds, it is recommended to set the detection time (timeout) at maximum. As indicated in the above table, the 3 jumpers SET0, SET1 and SET2 needs to be closed (Weld the three pairs of squares).

The installation is just prolonging the I2C connections that are on the Raspberry Pi.

The components list to be installed:

J20 and J21 Installation 2 connectors pin 3×1, for 1WIRE externals sensors.
IC2 DS18B20 temperature sensor
R19 to R21 4,7 kΩ resistor

Here an overall picture at this level of assembly.

The components list to be installed:

IC1 ULN2003
D13 à D16 green diode 3mm, (with + on square, the longer leg)
R41 à R44 470 Ω resistors
D9 à D12 diodes 1N4148
K1 à K4 relay 12V/16A
J28 à J31 Terminal with 3 blocks Screw

The components list to be installed:

IC7 MCP3204 R23 to R24 10 Ω resistors
C15,C16,C18 0,1 µF
C17 1 µF
the resistors R25 to R32 (bridge voltage divider), will be determined depending on the voltage to be measured.
It remains the connector Pin J25 5×1 and the connector Pin 2×1 for the jumper JP13 used to connect the grounds Card/measures if necessary.

The components list to be installed:

IC4 MAX3232
C19 à C23 capacitor 0,1µF
Connector PIN 3×1 will be used to connect RXD,TXD,GNG on a DB9 connector for example.

The components list to be installed:

Connector 40 pins female
C12, C13 0,1 µF
* J2,J6,J10 Connector RJ12 or PINs to solder

The Raspberry Pi is fixed on the card with 4 spacers 10mm and 8 screws M3, this is a temporary assembly because you'll have to add spacers to secure definitively the card in a box.