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ECB Minimal Bridge / Backplane PCB for Eurocards DIN41612 2 slot 3U 8HP

Introduction

I have originally designed this bridge / backplane for a few of my projects, 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.

Design of my backplane PCB was inspired by ECB Mini Backplane from RetroBrew Computers Wiki. I definitely recommend going through their webpage!

You can use this backplane free standing on table or fit in industry standard 3U subrack, however Z rais is required to install in subrack. Backplane was designed according to standard mechanical values, so it matches nicely in PCB guide rails with front panel Eurorack if you wish to use one. Size of card is 3U, 2x slots for 4HP cards. I'm using this with standard 160mm cards, but you can use whatever fits in your rack (100,160,220mm).

Card has been primary designed as standalone 2-slot backplane card to basically connect two cards outside rack configuration or as a bridge card to bridge two backplanes in daisy chain array configuration. In daisy chain bridge configuration you have to use male connectors and solder them to the back side.
You can fit power connector via one of the eurocards cards or use capacitor footpring C1-C2 as power connector. Card is double voltage ready. (Vcc, GND, GND, Vdd).
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 Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP

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: 35 x 99 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 2 slot x 96pin or 2x32pin 64 / 96 Pin connector, you can also fit 64pin edge connector in. Power connector is via one of the cards or use capacitor (C1-C2 as power connector). Card is double voltage ready. (Vcc, GND, GND, Vdd).
Copper Thickness: 35um
Card weight: 15g

Bill of materials

Identifier Value Qty Notes
Printed Circuit Board 35 x 99 mm 2 slot ECB backplane 1 v1.2
Hardware M2.5 x 10 mm screw 4
Hardware M2.5 nut 4
Connector E1,E2 DIN41612 connector, type C, Vertical, 3 rows 32 pins wide 2 DIN41612_C_3x32_Female_Vertical_THT Documentation (20 MB)
Connector E1,E2 DIN41612 connector, type C, Vertical, 3 rows 32 pins wide 2 DIN41612_C_3x32_Male_Vertical_THT Documentation (20 MB)
In bridge configuration, solder connectors to back of PCB
Connector E1-E2 Female DIN 41612 64pin 2x32pin right angle connector 2 2nd alternative use
Connector E1-E2 2x32pin 64pin PCB edge right angle connector 0.1" pitch 2 3rd alternative use
Capacitor C1,C2 C_Disc_D4.3mm_W1.9mm_P5.00mm 2 THT
Connector, power C1, C2 PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical 2 Use for or Dual V power input via backplane

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
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
Use capacitor footpring C1-C2 for Dual V power input via backplane, use 2x 1x03 0.1" dupont pin header, pull out middle pin.
Ground is common for both power rails, E1-E2 DIN connector holes are mechanical and are not connected to ground.
In daisy chain configuration use male connectors DIN41612_C_3x32_Male_Vertical_THT, solder on back side of PCB.

Schematic


File type File name File size Last modified
PCB schematic for 2 slot bridge / backplane v1.0 schematic_backplane2_v10.pdf 223 kB 14/04/2021

Design Files


File type File name File size Last modified
PCB layers v1.2 pcblayers_backplane2_v12.pdf 141 kB 22/01/2022
Gerbers 35 x 99 mm, 2 Layer FR4, v1.1 gerbers_2backplane_v12.zip 95 kB 22/01/2022

Photographs


click on pictures to enlarge
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
gerber files and photographs may vary, (rev.0) v1.0 pictured
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP
ECB Mini backplane bridge PCB for Eurocards DIN41612 2 slot 3U 8HP

Versions and revisions


This section lists the project version and revision history.

v1.2

■ Various silkscreen updates

v1.1

■ Added bypas capacitors C1, C2
■ Various silkscreen updates
■ Various cosmetic updates
■ Added 45° chamfered corner edges

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