2 layers
PCB Layout
chgopireddy/Full-Bridge-Class-D-Audio-Amplifier
LTspice Model for Full Bridge Class D, Voltage Mode Control, Peak Current Mode Control
63 parts6
2 layers87 × 63.5 mm
Sr Design
EngineerGuySam/Cat-TurretA Raspberry Pi 4–powered pan-and-tilt water gun that uses a camera and YOLO machine learning to detect cats on counters. Built with Python, the system tracks movement, aims with servos, and sprays water to deter unwanted feline adventures.
- Size
- 87 × 63.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 24
- Pads
- 101
- Tracks, vias
- 208, 9
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 29 Aug 2025
- Updated
- 15 Oct 2025
Overview
Sr Design is an open-source printed circuit board by EngineerGuySam, from the EngineerGuySam/Cat-Turret repository on GitHub. It is a 2-layer board of 87 × 63.5 mm with 46 parts on 24 nets, routed with 208 tracks and 9 vias.
It is built around the LM555CN, 74VHC138MTCX and USB-A1HSW6. Its parts include 15 connectors, 8 resistors, 4 diodes, 2 capacitors and 2 transistors.
Main components
3
LM555CN
PDIP-80℃~+70℃ 10mA 4.5V~16V PDIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
74VHC138MTCX
TSSOP-16-40℃~+85℃ 2V~5.5V 3/8 40uA 7.2ns@5V,50pF 74VHC 8mA Decoder Power-off protection、Level shifting Single Supply TSSOP-16 Signal Switches, Multiplexers, Decoders ROHSonsemiSignal Switches, Multiplexers, Decoders
USB-A1HSW6
插件0℃~+85℃ 1 1A 30V 4P Female Right Angle Type-A White Plugin USB Connectors ROHSOn-Shore TechUSB Connectors
README
README.mdCat-Turret
A Raspberry Pi 4–powered pan-and-tilt water gun that uses a camera and YOLO machine learning to detect cats on counters. Built with Python, the system tracks movement, aims with servos, and sprays water to deter unwanted feline adventures.
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | TestPoint | TestPoint:TestPoint_Loop_D2.50mm_Drill1.0mm | TP_+5V1, TP_+7V1, TP_+12V1, TP_GND1, TP_GPIO_16, TP_GPIO_20, TP_GPIO_22, TP_GPIO_23, TP_GPIO_24, TP_GPIO_27 |
| 4 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4, R5, R9 |
| 4 | MountingHole_4.445mm_M4_ISO7380_Pad_TopBottom | mounting_hole:MountingHole_4.445mm_M4_ISO7380_Pad_TopBottom | M1, M2, M3, M4 |
| 2 | 1N5818 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D3 |
| 2 | 1u F | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 2 | 300 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | C6144 | Package_TO_SOT_THT:TO-126-3_Vertical | Q1, Q2 |
| 1 | 1200 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 330 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 555 GPIO | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_CUI_PJ-063AH_Horizontal | J26 |
| 1 | Buck 12V+ | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | Buck GND | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | GPIO 16 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J1 |
| 1 | GPIO 20 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J2 |
| 1 | LED_G | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4 |
| 1 | LED_R | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | LM555CN | LM555CN:DIP762W46P254L960H508Q8 | U6 |
| 1 | Pan Interface | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J14 |
| 1 | Pi Buck 5V | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J19 |
| 1 | Servo Buck 7V | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J23 |
| 1 | Solenoid Interface | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J12 |
| 1 | Tilt Interface | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | USB-A1HSW6 | USB-A1HSW6:OST_USB-A1HSW6 | J25 |
| 1 | Water Float Switch | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J13 |
| 1 | Water Pump Interface | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | WaterGun GPIO | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J7 |
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Questions
How big is the Sr Design PCB?
It measures 87 × 63.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sr Design use?
46 parts, built around the LM555CN, 74VHC138MTCX and USB-A1HSW6. 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 Sr Design KiCad files?
From the EngineerGuySam/Cat-Turret repository on GitHub, at the commit this page was made from: the board is Schematics/Sr Design/Sr Design.kicad_pcb and its schematic Schematics/Sr Design/Pan_and_Tilt.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sr Design design in my own project?
Its repository states no licence, so its author keeps all rights: ask EngineerGuySam before reusing the design.