Truly Random-Number Generator
Meets NIST standard with cheap components
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.
TIP: your first PCB at AISLER is free up to €30 with using the coupon code ELCCBB at checkout.
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.
Extra info / Update
computers & Internet, security, cryptography, gaming
Level
Expert level
Time
4 hours approximately
Tools
SMD soldering, AVR programmer, adjustable power supply
Costs
€150 / $155 / £125 approximately
Component list
Resistors
Default: 0805, 100mW, 5%
R1,R5,R9,R10,R11,R12,R16,R20,R25,R26,R39,R48,R49,R50 = 10 kOhm
R2 = 470kOhm
R3,R13 = 1MOhm
R4 = 20MOhm
R6,R7,R8,R30,R31,R35,R36 = 470Ohm
R14,R18,R22,R32,R34,R44,R45,R46 = 100kOhm
R15,R17,R37,R42 = 1.5kOhm
R19,R40 = 15kOhm
R21 = 4.7kOhm
R23,R24,R29 = 33kOhm
R27,R28,R38 = 1kOhm
R33 = 220Ohm
R41 = 100Ohm
R43 = 2.2kOhm
R47 = 330kOhm
P1 = trimpot, 1 kOhm, 11-turn, SMD
P2,P6 = trimpot, 10kOhm, 11-turn, SMD
P3,P4 = trimpot, 200Ohm, 11-turn, SMD
P5 = trimpot, 200kOhm, 11-turn, SMD
Capacitors
Default: 0805
C1,C2,C5,C8,C9,C13,C14,C15,C16,C25,C29,C30,C35 = 100nF
C3,C4 = 22pF
C6,C21,C22 = 10µF, 6.3V, case A
C7,C33 = 1 µF
C10,C11,C12,C17,C18,C19,C20,C26,C28,C32,C34 = 100µF, 10V, case B
C23 = 22µF, 10V, case A
C24,C27 = 10nF
C31,C41 = 470pF
C36,C40,C48 = 220pF
C37,C38,C45,C46 = 100pF
C39,C47 = 120pF adjustable capacitor (eBay is your friend)
C42 = 1nF
C43 = 2.2nF
C44 = 47pF
Inductors
L1,L2,L3 = 100µH, 0805
L4 = 10mH, 2220
Semiconductors
IC1 = ATtiny2313V-10SUR, programmed
IC2 = L7806CD2T-TR (or NJM7806DL1A-TE1)
IC3,IC6 = TL431AMFDT
IC4,IC5 = L78L33ACUTR
D1,D2,D3,D4,D5,D8,D9 = 1N4148WS
D6 = BAT854W
D7,D10 = BZX384-C12
T1 = BC857CW
T2,T3,T4,T5,T6,T7 = BC847BW
LED1,LED4 = green, 2x1.25 mm
LED2 = red, 2 x 1.25mm
LED3 = yellow, 2 x 1.25mm
Miscellaneous
X1 = 10 MHz quartz crystal, 18pF, 5.0x3.2mm
S1,S2,S3 = Tactile switch
S4 = DIP switch, 4-way
S5 = DIP switch, 7-way
S6 = DIP switch, 5-way
S7 = DIP switch, 3-way
K1 = SD card connector type SDBMF-00915B0T2
K2 = 2-way PCB screw terminal block, 3.5 mm pitch
K3,K4 = 1 pinheader pin
K5 = 6-pin pinheader (2x3), 0.1’’ pitch
K6 = 5-way pinheader, 0.1’’ pitch
Component List, BSA
Resistors
Default: (0805, 100mW, 5%)
R1 = 1kOhm
R2,R4,R6 = 22kOhm
R3 = 100kOhm
R5,R7,R8,R9,R20,R21,R23,R24,R26,R27 = 10kOhm
R10,R19,R22,R25 = 470kOhm
R11,R12,R13,R14,R15,R16,R17,R18 = 1MOhm
P1 = 10kOhm, trimpot, SMD
P2,P3,P4,P5 = trimpot, 200kOhm
Capacitors
Default: 0805
C1, C2,C23 = 22pF
C3,C4,C5,C6,C7,C10,C13,C16,C19 = 100nF
C8 = 100µF, 16V, radial can SMD
C9,C12,C15,C18 = 22µF, 16V, radial can SMD
C11,C14,C17,C20 = 1µF
C21,C22 = 10µF, 25V, radial can SMD
Inductors
L1 = 10µH, 0805
Semiconductors
D1,D2 = 1N4148WS
D3 = MRA4007T3G
IC1 = ATmega8-16AU
IC2 = LM324MX
IC3 = TL7660CD
Miscellaneous
X1 = 16 MHz quartz crystal, 18pF, 5x3.2mm
JP1 = 2-pin pinheader, 0.1” pitch
Jumper, 0.1’’ pitch
K1 = 5-way pinheader socket, 0.1’’ pitch (solder side)
LCD1 = alphanumeric, 16 columns, 2 lines
16-pin pinheader (for LCD), 0.1’’ pitch
16-way pinheader socket (for LCD), 0.1” pitch
Shopping List
150116-1 PCB
150116-2 PCB
150116-41 Programmed microcontroller
150116-42 Programmed microcontroller
Discussion (0 comments)