2 layers101.6 × 120.7 mm
Mss cascade basic testjig
IowaScaledEngineering/mss-cascade
Integrated Cascade Module for Free-mo Modular Signal System
101 parts
2 layers139.7 × 88.9 mm
Bd tester
IowaScaledEngineering/ckt-bd13Single Channel DCC Block Detector
- Size
- 139.7 × 88.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 36
- Pads
- 140
- Tracks, vias
- 280, 60
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Jan 2016
- Updated
- 20 Jun 2026
Overview
Bd tester is an open-source printed circuit board by IowaScaledEngineering, from the IowaScaledEngineering/ckt-bd1 repository on GitHub. It is a 2-layer board of 139.7 × 88.9 mm with 51 parts on 36 nets, routed with 280 tracks and 60 vias.
It is built around the ATTINY85-20SU, DRV8231ADSG and AP7381-50Y, with the FSM4JSMATR, PJ-202A and SM04B-SRSS-TB among its other parts. Its parts include 8 diodes, 7 resistors, 7 connectors, 4 capacitors and 4 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
6
ATTINY85-20SU
SOIC-8-208mil-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DRV8231ADSG
WSON-8(2x2)-40℃~+150℃ 1 1uA 3.7A 4.5V~33V 600mΩ Yes WSON-8(2x2) Brushed DC Motor Drivers ROHSTexas InstrumentsBrushed DC Motor Drivers
AP7381-50Y
SOT-89-40℃~+125℃@(Tj) 1 150mA 1V@(100mA) 2.5uA 40V 5V 60dB Fixed Positive Short Circuit Protection、Thermal Shutdown SOT-89 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
FSM4JSMATR
SMD-4P,6x6mm-40℃~+85℃ 1.6N 100,000 cycles 24V 50mA 5mm 6mm 6mm Gull Wing Round Button SPST-NO Surface Mount,Vertical Without Bracket SMD-4P,6x6mm Tactile Switches ROHSTE ConnectivityTactile Switches
PJ-202A
插件-25℃~+85℃ 2.5A 24V 2mm 6.5mm DC Power Jack Right Angle 插件 DC Power Connectors ROHSCUIDC Power Connectors
SM04B-SRSS-TB
Header SR 1.0 SMT side entry, 1mm pitchJSTUncategorised
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12 |
| 6 | TestPoint | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | TP2, TP3, TP4, TP6, TP7, TP8 |
| 5 | 1k | Resistor_SMD:R_0805_2012Metric | R3, R4, R5, R6, R7 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric | C3, C4 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | AMBER | LED_SMD:LED_0805_2012Metric | D2, D7 |
| 2 | BLUE | LED_SMD:LED_0805_2012Metric | D3, D8 |
| 2 | DRV8231A | Package_SO:Texas_HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.4x3.1mm_ThermalVias | U2, U3 |
| 2 | RED LED | LED_SMD:LED_0805_2012Metric | D4, D5 |
| 2 | TestPoint | TestPoint:TestPoint_THTPad_3.0x3.0mm_Drill1.5mm | TP1, TP5 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 68uF | Capacitor_SMD:CP_Elec_6.3x5.8 | C1 |
| 1 | AP7381-50Y | ISE_Generic:SOT-89-3 | U1 |
| 1 | ATtiny85-20S | ISE_Generic:ATMEL_SO8_DUAL | U4 |
| 1 | AVR-ISP | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J7 |
| 1 | CDBM140G | ISE_Generic:SOD-123T | D1 |
| 1 | FSM4JSMATR | ISE_Generic:TE_FSM4JSMA | SW1 |
| 1 | GREEN LED | LED_SMD:LED_0805_2012Metric | D6 |
| 1 | MOLEX_26605060 | ISE_UltraLibrarian:MOLEX_26605060 | J4 |
| 1 | MOLEX_9481054 | ISE_UltraLibrarian:MOLEX_9481054 | J3 |
| 1 | PJ-202A | ISE_Generic:CUI_PJ-202A | J2 |
| 1 | SM04B-SRSS | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J1 |
| 1 | Turret for DCC Phase A | MountingHole:MountingHole_2.7mm_Pad | J5 |
| 1 | Turret for DCC Phase B | MountingHole:MountingHole_2.7mm_Pad | J6 |
Questions
How big is the Bd tester PCB?
It measures 139.7 × 88.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bd tester use?
51 parts, built around the ATTINY85-20SU, DRV8231ADSG, AP7381-50Y and FSM4JSMATR. 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 Bd tester KiCad files?
From the IowaScaledEngineering/ckt-bd1 repository on GitHub, at the commit this page was made from: the board is kicad/bd-tester/bd-tester.kicad_pcb and its schematic kicad/bd-tester/bd-tester.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bd tester design in my own project?
Its repository states no licence, so its author keeps all rights: ask IowaScaledEngineering before reusing the design.
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