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

'SVXLink Card' Board Edition 2016 Edition 1.1 Carte SVXLink Card Edition 2015 Edition 1.0

You will find here the definition of the protype board version 1.0

Drilling template PDF

Drilling template DXF

 Drilling template A4

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
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
(¹) Component not to be used when X2 KIM-055L is choosen for 5V power supply:
  • C2,
  • D2,
  • L1,
  • X1 (LM2575T-5)

The PCB of the SVXLink Card

Power supply

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
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.



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.


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).

I2C and 1 WIRE connectors

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

Analog to digital converter

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.

RS232 Port

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.

Raspberry Pi Connector

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.

Final result of the board

 Final result Svxlink interface SvxCard

 Final result Svxlink interface SvxCard

 Connection used by SvxCard on the Raspberry Pi

 Gpio of Raspberry Pi 2 or Raspberry Pi 3root@f5uii-serveur:/var/www/dwiki/data/pages/en#