2 layers50 × 23.2 mm
Analog
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
32 parts1kGPL-3.0
2 layers
Oip opa818 alt
aewallin/One-Inch-Photodetector33Photodiode transimpedance amplifier, on a one inch diameter circular PCB
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 24
- Pads
- 107
- Tracks, vias
- 175, 85
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 29 Feb 2020
- Updated
- 29 Nov 2025
Overview
Oip opa818 alt is an open-source printed circuit board by aewallin, from the aewallin/One-Inch-Photodetector repository on GitHub. It is a 2-layer board with 32 parts on 24 nets, routed with 175 tracks and 85 vias.
Its parts include 13 capacitors, 6 resistors, 4 ICs, 3 diodes and 2 connectors.
README
OPA818_ALTpinout/readme.mdOPA818 with BUF602 output-buffer, for Fermionics FD80 photodiode
Note pinout: 1 Anode, 2 Cathode, 3 Case - this differs from Hamamatsu S5973 and similar photodiodes.
For detection of beat-notes between a femtosecond frequency comb and CW lasers, two detectors built with Fermionics FD80FC fiber-coupled InGaAs photodiode with 5.1 kOhm transimpedance shows >250 MHz bandwidth. Figure shows output-referred noise from detector, in 10 kHz RBW. TIASim model fits the measurement data with a parasitic capacitance of 0.16 pF.
Lowest trace shows spectrum analyzer noise floor with no DUT connected.
Note use of "Sample" detector mode required to relate measurements to calculated predictions. Dark noise is detector output with powersupply on, but no light on detector. Bright or frequency-response is detector output signal with modulated laser light on the detector, modulator driven from spectrum analyzer Tracking Generator output.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C101, C102, C103, C107, C112, C113, C114 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C105, C106, C108, C109 |
| 2 | 10R | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 56k | Resistor_SMD:R_0603_1608Metric | R101, R107 |
| 2 | D | Diode_SMD:D_SOD-323F | D101, D103 |
| 2 | TestPoint | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP101, TP102 |
| 1 | 100u | Inductor_SMD:L_0805_2012Metric | L101 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C104 |
| 1 | 300R | Resistor_SMD:R_0603_1608Metric | R102 |
| 1 | 49R9 | Resistor_SMD:R_0603_1608Metric | R106 |
| 1 | BUF602xDBV | Package_TO_SOT_SMD:SOT-23-5 | U104 |
| 1 | C | Capacitor_SMD:C_0402_1005Metric | C115 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J102 |
| 1 | Conn_Coaxial | Connector_Coaxial:MMCX_Molex_73415-1471_Vertical | J101 |
| 1 | LT3042xMSE | Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm | U101 |
| 1 | LT3093xMSE | Package_SO:MSOP-12-1EP_3x4.039mm_P0.65mm_EP1.651x2.845mm | U102 |
| 1 | OPA818xDRG | Package_SON:WSON-8-1EP_3x3mm_P0.5mm_EP1.45x2.4mm | U1 |
| 1 | R | Resistor_SMD:R_0402_1005Metric | RF101 |
| 1 | TO18_photodiode_altpinout | Package_TO_SOT_THT:TO-18-3 | D1 |
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Questions
What parts does the Oip opa818 alt use?
32 parts. 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 Oip opa818 alt KiCad files?
From the aewallin/One-Inch-Photodetector repository on GitHub, at the commit this page was made from: the board is OPA818_ALTpinout/oip_opa818_alt.kicad_pcb and its schematic OPA818/oip_opa818.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Oip opa818 alt design in my own project?
Its repository states no licence, so its author keeps all rights: ask aewallin before reusing the design.