One-time Pad Crypto Shield
secure communication through openness
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
Components
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Component List
Resistors
Default: 0805, 125mW, 5%
R1,R18,R24 = 1.8kΩ
R2,R16,R17 = 10kΩ
R3,R21,R22 = 3.3kΩ
R4,R10,R11 = 680Ω
R5,R12,R14,R15 = 1kΩ
R6,R7,R23 = 4.7kΩ
R8 = 22kΩ
R9 = 7.5kΩ, 1%
R13 = 470Ω
R19 = 100kΩ
R20 = 1.5kΩ
P1 = 10kΩ trimpot
P2 = 1kΩ trimpot
Capacitors
Default: SMD 0805
C1,C2,C4,C5,C6,C7,C8,C9,C13,C16,C17,C18,C20 = 100nF
C3 = 100µF, 10V, Case B
C10,C12 = 1µF
C14,C15 = 33pF
C11 = 0.22F, 5.5V, supercap, 5mm pitch
C19 = 2.2µF, 16V, Case A
Semiconductors
IC1 = HCPL-817-000E
IC2 = MAX3232CPWR
IC3 = TCM3105NL
IC4 = LE33CZ-TR
T1 = BC847C
T2 = TSM2302CX RFG
LED1,LED2,LED3 = green, 0805
LED4,LED5.LED6 = yellow, 0805
LED7 = red, 0805
Miscellaneous
K1 = 8-pin pinheader, 0.1" pitch
K2 = 10-pin pinheader, 0.1" pitch
K3,K5 = 6-pin pinheader, 0.1" pitch
K4 = 12-pin pinheader, 0.1" pitch
K6 = Micro SD card socket, Molex 47309 Series
K7,K8,K9,JP1 = 2-pin pinheader, 0.1" pitch
K10 = Micro USB type-B receptacle
S1,S2,S3 = tactile-feedback switch, 6x6.2mm, SMD
X1 = 4.433619MHz quartz crystal,
MOD1 = 12-pin (2x6) pinheader, 0.1" pitch
DIP socket, 16 contacts
PCB #160510-1, from Elektor Store
Miscellaneous
WIZ107SR Serial-to-Ethernet Module
Elektor Uno R4
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