Block Relay Daughter

DavidMFlynn·SerialMRRC·Block Relay PCB/BlockRelay.kicad_pcb

Block Relay Daughter PCB layout, top view — open source board by DavidMFlynn

About the Block Relay Daughter PCB

Block Relay Daughter is an open source PCB design by DavidMFlynn, published on GitHub under the MIT license. It is a 2-layer board measuring 157.5 × 99.1 mm, with 92 components from 19 distinct parts.

Other key parts include the 74HC259, 74LS251 and L78L05_SOT89. By type, the board carries 31 diodes, 27 resistors, 16 capacitors, 6 transistors, 6 relays and 3 ICs.

It belongs with the robotics & motion designs in this gallery.

From the project

Serial Model Railroad Control

This is a set of PCBs and software to control a model railroad with RS485 data buss.

Anamation Controller, 8 servos Block Detector, detects voltage across diode/resistor Optical Detector, broken beam or reflected beam

When a command packet is received from RX1 (RS485): Source=any, Destination=Me: Parse and Process the command. Send any requested data back to the sender on TX1 (RS485). Source=any, Destination=Master: Retransmit on TX2 (USB) Source=any, Destination= other than Master or Me do nothing.

Main components on the Block Relay Daughter

74HC259 74LS251 L78L05_SOT89

Block Relay Daughter bill of materials (BOM)

92 components, 19 distinct parts.

Qty	Part	Footprint	Refs
1	74HC259	SOIC-16_3.9x9.9mm_P1.27mm	U1
1	74LS251	SO-16_3.9x9.9mm_P1.27mm	U2
1	L78L05_SOT89	SOT-89-3	U5
6	2N7000	TO-92_Inline	Q1, Q2, Q3, Q4, Q5, Q6
1	Screw_Terminal_01x16	TerminalBlock_Phoenix_PT-1,5-16-3.5-H_1x16_P3.50mm_Horizontal	J1
1	Conn_02x06_Odd_Even	PinHeader_2x06_P2.54mm_Vertical	J2
1	Conn_02x08_Odd_Even	PinSocket_2x08_P2.54mm_Vertical	J3
6	Relay_DPDT	Relay_DPDT_Finder_40.52	K1, K2, K3, K4, K5, K6
13	1A 1000V	D_SMA_Handsoldering	D1, D2, D3, D4, D5, D6, D7, D8 +5
10	Yellow LED	LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder	D14, D15, D16, D17, D18, D19, D28, D29 +2
8	Schottky_AKA DPAK	TO-252-2	D20, D21, D22, D23, D24, D25, D26, D27
2	3.3uF	C_Radial_D5.0mm_H5.0mm_P2.00mm	C1, C8
14	0.1uF	C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C2, C3, C4, C5, C6, C7, C9, C10 +6
7	4K7	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R10, R11, R12, R13, R14, R15
6	47R	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R2, R3, R4, R5, R6, R7
2	2K2	R_Axial_DIN0516_L15.5mm_D5.0mm_P20.32mm_Horizontal	R8, R9
4	1K0	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R16, R17, R18, R19
4	27K	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R20, R22, R24, R26
4	2K2	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R21, R23, R25, R27

Block Relay Daughter design files

The KiCad project lives in the DavidMFlynn/SerialMRRC repository on GitHub; these links point at the commit this page was built from.

LayoutBlock Relay PCB/BlockRelay.kicad_pcb
SchematicBlock Relay PCB/BlockRelay.kicad_sch

Block Relay Daughter: common questions

How big is the Block Relay Daughter PCB?

The Block Relay Daughter measures 157.5 × 99.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Block Relay Daughter?

92 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the Block Relay Daughter design files?

From the DavidMFlynn/SerialMRRC repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Block Relay Daughter design in my own project?

Yes, under the terms of its MIT license, which DavidMFlynn chose for the repository.

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