4 layers35 × 23 mm
AOD protector main
JQIamo/AOD_protector
The protection circuit for the acousto-optic deflectors used for tweezers
33 partsMIT
2 layers65.4 × 30.5 mm
HRNG v4
SmittyHalibut/PiHRNGA hardware random number generator on a Raspberry Pi hat.
- Size
- 65.4 × 30.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 48
- Pads
- 119
- Tracks, vias
- 153, 195
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 30 Jul 2019
- Updated
- 30 Jul 2019
Overview
HRNG v4 is an open-source printed circuit board by SmittyHalibut, from the SmittyHalibut/PiHRNG repository on GitHub. It is a 2-layer board of 65.4 × 30.5 mm with 33 parts on 48 nets, routed with 153 tracks and 195 vias.
It is built around the MAX9141ESA+, MMDT3904 and MMBT3904. Its parts include 8 capacitors, 8 resistors, 4 transistors, 3 connectors and 1 IC.
Main components
3
MAX9141ESA+
SOIC-8-40℃~+85℃ 1 1.5mV 120nA 165uA 2.7V~5.5V 2mV 40ns 90nA Built-in hysteresis、Latch function、Enable/shutdown function Rail-to-rail input TTL、CMOS SOIC-8 Comparators ROHSMaxim Integrated (Analog Devices)Comparators
MMDT3904
SOT-363-55℃~+150℃ 100 2 NPN 200mA 200mV 200mW 300MHz 40V 50nA 6V NPN SOT-363 Bipolar (BJT) ROHSDiodes IncorporatedBipolar (BJT)
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
README
README.mdPiHRNG
It's pronounced "Pi Ring," or perhaps "Pie Ring" if you'd prefer.
A hardware random number generator on a Raspberry Pi hat.
More here later. (Famous last words, by @SmittyHalibut)
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7 |
| 5 | .1uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1, C2, C3, C4, C5 |
| 4 | 4.7k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1, R2, R5, R6 |
| 3 | 10uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C6, C7, C8 |
| 3 | MMDT3904 | Package_TO_SOT_SMD:SOT-363_SC-70-6_Handsoldering | Q1, Q2, Q3 |
| 2 | 1M | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R3, R4 |
| 2 | 33 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R7, R8 |
| 1 | 1mH | Inductor_SMD:L_1206_3216Metric_Pad1.42x1.75mm_HandSolder | L1 |
| 1 | Conn_01x01 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J3 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | MAX9141 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q4 |
| 1 | Raspberry_Pi_2_3 | Module:Raspberry_Pi_Zero_Socketed_THT_FaceDown_MountingHoles | J1 |
| 1 | Schottky | Diode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
Questions
How big is the HRNG v4 PCB?
It measures 65.4 × 30.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HRNG v4 use?
33 parts, built around the MAX9141ESA+, MMDT3904 and MMBT3904. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the HRNG v4 KiCad files?
From the SmittyHalibut/PiHRNG repository on GitHub, at the commit this page was made from: the board is hardware/HRNG-v4/HRNG-v4.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the HRNG v4 design in my own project?
Its repository states no licence, so its author keeps all rights: ask SmittyHalibut before reusing the design.
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