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ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP

Introduction

I have originally designed this backplane for few of my project, (Rubidium frequency standard and Z80 Micro Computer) but this turn out so well that I have now posted all schematic, gerber files and documentation to fellow enthusiast such as yourself :) Perhaps (and I hope) content in this obscured corner of interwebs will inspire you to start your own projects.

Eurocards system in general is enormously versatile for all kinds of projects thanks to standardized mechanical dimensions and quality connectors. You can literally make any project and skale it up as much as you wish.
Design of my backplane PCB was inspired by ECB Backplane-8 167mm from RetroBrew Computers Wiki. I definitely recommend going through their webpage!

You can use this card in industry standard 3U DIN subrack or Eurorack without Z rail (however the card will also work with Z rail). Card matches nicely in PCB guide rails with front panel Eurorack if you wish to use one. Size of a card is 3U height with 8 slots for 4HP cards. I'm using this with standard 160mm cards, but you can use whatever fits in your rack (100,160,240mm).

Card has been designed to be very versatile and you can fit 4pin Molex power connector to the back or front if you wish to use it in an outside rack configuration. Backplane can also be extended with 2 slot bridge connector card to create a daisy chain array of backplanes if required.
These boards look absolutely gorgeous in standard green solder mask if you going for that standard industrial look. I can advise you where to buy connectors, however you can use any standard 96/64pin Eurocard connectors or 2x32, 64pin PCB edge connectors which you can pretty puch purchase anywhere.

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click on pictures to enlarge
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP

Purchase item



... but if you feel like getting something for nothing isn't your cup of tea (completely understandable) (ಥ﹏ಥ) and a prefer to support me and get something back in return, then you please purchase this item directly from my on my eBay shop (click on FleaBay logo above). However if you are still up for an adventure (and are happy to have PCB's made yourself in your favourite PCB house - JLCPCB is recommended), then carry on and download gerber files further down. ( ͡° ͜ʖ ͡°)

Specs


Board Type: Backplane
Board Material: FR4-Standard Tg 130-140C Epoxy Glass Composite
Layers: Double sided
PCB Colour: Green colour solder mask, white silk screen lettering
Surface Finish: Lead free HASL-RoHS
External size: 160.02 x 128.60 mm
Board Thickness: standard 1.6mm
Pitch: 2.54mm connectors (100.00 mils)
Connector hole matrix: 96 DIN 41612C compatible / PCB edge card connector 2x32 / 64pin compatible
Hole size: 1.00mm
Mounting holes: Standard pitch 3U subrack mount
Board Connector / Footprint: DIN 41612 8 slot x 96pin or 2x32pin 64 / 96 Pin connector, you can also fit 64pin edge connector in. Power connector is via standard 4pin MOLEX 5.08mm / 200mil connector. Card is double voltage ready. (Vcc, GND, GND, Vdd).
Copper Thickness: 35um
Card weight: 70g

Bill of materials

Identifier Value Qty Notes
Printed Circuit Board 160.02 x 128.60 mm 8 slot ECB backplane 1 v1.2
Hardware M2.5 x 10 mm screw 16
Hardware M2.5 nut 16
Connector E1-E8 Female DIN 41612 96pin 3x32pin right angle connector 8 DIN41612_C_3x32_Female_Vertical_THT Documentation (20 MB)
TE Connectivity 5535043-5 (Mouser order code 571-5535043-5), or 535090 which has shorter pins
Connector E1-E8 Female DIN 41612 64pin 2x32pin right angle connector 8 2nd alternative use
Connector E1-E8 2x32pin 64pin PCB edge right angle connector 0.1" pitch 8 3rd alternative use
Connector U1, U2 Molex 15-24-4745 THD male 4pin 0.2" pitch 1 Farnell order code 1391827
Capacitor C1-C14 Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm 14
Resistor R1, R2 1k THD 0.5W 2 VCC rail
Resistor R3, R4 3.3k THD 0.5W 2 VDD rail
LED LED1,LED2 RED THD Dia 3.0mm_P2.50mm 2
Connector PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical 1 THT

Assembly instructions and notes


Gerber files contain " JLCJLCJLCJLC" to the silk layer. You can specify a location of the order number, select the "Specify a location" option when you place an order. Only if you order via JLCPCB
. Please note that PCB is connected via ground chassis plane on Z rail. If you don't desire to connect ground chassis and prefer to connect via molex connectors, then cut little GND xxx trace on the top left corner on the back side of PCB.
If you will use PCB backplane as rack mount: - install molex connectors, resistors, LED's and pin headers to the back side, otherwise components won't fit due to Z rails.
If you will use PCB backplane as table top or custom mount: - install all components to front side. Use standoffs or rubber feet to electrically isolate from surface.
Use M2.5 screws and nuts to hold DIN connectors in place, these don't need to be fitted to achieve strong mechanical connection however
Use a temperature-controlled soldering station and quality solder. Take care not to leave solder bridges as any short circuit will most likely lead to failures

Schematic


File type File name File size Last modified
PCB schematic for 8 slot backplane v1.0 schematic_backplane_8-10-12.pdf 687 kB 03/01/2022

Design Files


File type File name File size Last modified
PCB layers v1.2 pcblayers_backplane8_v12.pdf 397 kB 19/01/2022
Gerbers 168 x 128 mm, 2 Layer FR4, v1.2 gerber_backplane08_v12.zip 483 kB 19/01/2022

Photographs


click on pictures to enlarge
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
gerber files and photographs may vary, v1.0 pictured
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP
ECB Backplane PCB for Eurocards DIN41612 8 slot 3U 32HP

Versions and revisions


This section lists the project version and revision history.

v1.2

■ Various silkscreen updates
■ Various cosmetic updates
■ Hatch patter and solder mask on back side
■ Bigger plane padding about border of PCB

v1.1

■ Various silkscreen updates
■ Various cosmetic updates
■ Redesigned LED and resistors to fit better


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