Photomarker tht
About the Photomarker tht PCB
Photomarker tht is an open source PCB design by SheinbergLab, published on GitHub under the MIT license. It is a 2-layer board measuring 75 × 55 mm, with 20 components from 12 distinct parts.
Other key parts include the OPT101P and LM393P. By type, the board carries 12 resistors, 3 capacitors, 2 ICs and 2 connectors.
From the project
Data server system for data acquisition and control
A per-rig photodiode board that timestamps stimulus light onset two ways at once: an analog waveform into an MCP3204 channel, and a comparator edge into a dserv DI pin (IRQ-latched with a box-clock stamp, so it beats the ~100 µs ADC scan quantization).
Wire both. The digital edge is the routine per-trial timestamp; the analog trace is how you verify the edge means what you think, because a fixed voltage threshold lands at a different fraction of the transition for black→white than for a gray-to-gray change.
Main components on the Photomarker tht
Photomarker tht bill of materials (BOM)
20 components, 12 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OPT101P OPT101 | DIP-8_W7.62mm | U1 |
| 1 | LM393P LM393 | DIP-8_W7.62mm | U2 |
| 1 | 306-B5BPHKSLFSNP JST-PH 5 | JST_PH_B5B-PH-K_1x05_P2.00mm_Vertical | J1 |
| 1 | DNP | PinHeader_1x05_P2.54mm_Vertical | J2 |
| 1 | 3296W-1-503LF 50k | Potentiometer_Bourns_3296W_Vertical | RV1 |
| 2 | K104K15X7RF5UH5 100n | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2 |
| 1 | FKP2D013301G00JSSD 3n3 C0G | C_Disc_D5.0mm_W2.5mm_P5.00mm | C3 |
| 4 | MFR-25FBF52-10K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R4, R11 |
| 1 | MFR-25FBF52-270K 270k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | MFR-25FBF52-100R 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 5 | DNP | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R12, R13, R14, R15 |
| 1 | MFR-25FBF52-2K2 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
Photomarker tht design files
The KiCad project lives in the SheinbergLab/dserv repository on GitHub; these links point at the commit this page was built from.
Photomarker tht: common questions
How big is the Photomarker tht PCB?
The Photomarker tht measures 75 × 55 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Photomarker tht?
20 components, from 12 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Photomarker tht design files?
From the SheinbergLab/dserv repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Photomarker tht design in my own project?
Yes, under the terms of its MIT license, which SheinbergLab chose for the repository.
