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POWDIS


price: 35.00 EUR (43.05 incl.VAT)

This is the die-hard approach to power distribution or call it busboard for Eurorack modular. Made to prove that even such a simple component can be made with care for every detail. This is no teeny-weeny bus board with itsy-bitsy traces that can't handle real currents. There's a lot of copper used on top and bottom sides of PCB to minimize resistance to insane levels. It uses 125 micron copper, that is almost 4 times thicker than good quality PCBs. The PCB itself is also thicker (2mm) and it's not so likely to bend.
This is all you need to go along with nice and clean linear power supply, but if your case is powered by switching power supplies like popular MeanWell bricks, it's good idea to add one or two Noise Killer Plugs that will clean most of the high frequency noise. NKP does not take any pin header as it's pass-thru device, there's still 18 power ports available for modules even with 18 NKPs in place (although it makes no sense to insert more than 4).
Power input uses heavy duty M4 screw terminals, no need to crimp any kind of connectors when wiring power supply, just strip the wire. It's also easy to chain, as the terminals easy accept 2 wires.
Each busboard is fully tested on each connector at 3A current per rail.

Why is it so important to have low GND resistance? Imagine there are few modules plugged in, drawing considerably high currents. This combined current causes voltage drop on busboard traces. For example if your GND trace has 0.1 ohm, which seems pretty low, and there is about 500mA flowing to GND rail (not so much really for one row of modules), then you get 50mV offset created between different power connectors. And since every CV is referenced to GND, that means every module on the busboard will be affected with a voltage that means almost a semitone in 1V/oct scale. Power in old modulars was distributed in star-ground fasion to avoid that, but never in eurorack. POWDIS power distribution board comes to the rescue with the extreme 1 miliohm resistance measured from GND power terminal screw to the most distant 16-pin power connectors. This is even lower than resistance of single pin-plug connection. As a comparison, typical module power cable of 1ft length can have about 50-80 miliohms DC resitance per wire, that goes down to 8-13 miliohms when all 6 wires are used for GND.


Features:

  • 18 eurorack power connectors
  • current limit determined only by the quality of your ribbon cable
  • power input with M4 screw terminals
  • GND resistance of 1.1 mΩ
  • +12V, -12V and +5V rails resistance 2.5mΩ
  • dimensions 386 x 50mm (15.2 x 2'')
  • LED indication of active voltage for 3 power rails

Here's board layout PDF with mounting holes location. Print it in 1:1 scale to have the template for drilling. It's A3 size sheet, so unless you have serious size printer, this will come out as 2 pages.


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krisak's design