The ACL EVE 1 busboard distributes ultra-consistent power to up to 20 of your Eurorack modules, offering reliable operation and protecting your equipment from damage, and all in a compact form that′s as home in a large set-up as it is in a portable skiff case.
We always think it′s a shame when we see a Eurorack case filled with fantastic premium precision-crafted modules, only to discover that they′re supplied with power from a budget distribution board. It′s a bit like fuelling a Ferrari with budget petrol – it will move around, but it won′t sound right and the engine will get damaged pretty quickly!
That′s why we built our EVE 1 – to create as transparent an electrical path between your power supply unit and modules as possible. It delivers minimal electrical potential differences between the PSU and connection terminals, and between the modules and the terminals. This almost completely eliminates any measurable coupling effects between modules, and thus any resulting interference.
We achieve all this using a six-layer sandwich design, in which each voltage type supplied by the power supply unit – +12V, -12V and +5V, with three SMD-LEDs indicating the presence of different operating voltages – has its own complete layer for distribution to the module connection terminals. In other words, each has a complete, isolated layer of the bus board available as copper surface, and the ground rail actually has three layers available, resulting in an extremely low electrical resistance. Finally, three SMD-LEDs indicate the presence of the different operating voltages.
An easily overlooked, but important benefit of this sandwich design is that there is almost no influence between the +5V path (on which digital modules – which can often cause interference – are connected), and ground for the +/- 12V rails.
In addition, the +12V and -12V rails each feature four buffer capacitors (with 22uF and 100nF), arranged as parallel connected packets, at the outer ends of the board. These capacitors are Ultra Low ESR MLCC types, which are excellent for decoupling the different modules, ensuring minimum electrical interference between all of your connected modules.
Furthermore, up to four CV and gate buses are available (two at the top and two at the bottom, each bridged by a jumper). In keeping with the low noise design, these are shielded from each other, and from the voltage bars, so are crosstalk-free.
Two busboards in one
Whether you′re Hans Zimmer with a floor-to-ceiling rack, or a gigging techno producer with a 6U 84HP skiff case, behind the scenes things get confusing and cramped, so we′ve designed our EVE 1 to be effectively two busboards in one.
The module connection terminals are arranged in two lines of 10 terminals, each protected against polarity reversal. This arrangement makes the busboard ideal for supplying two rows of modules in your rack, with almost identical power supply conditions for all connected modules, using only one power supply unit, and without needing additional cables connecting boards affecting the uniformity of the signal.
Of course, if a single ACL EVE 1 busboard is not sufficient to supply all modules – in larger cases, for example – several busboards can be connected in parallel. For this purpose, there are two power terminals connected in parallel on the board, both of which are arranged in the middle and have different designs.
One connector (5-pin) is ideally suited for use with the ACL KAZU PSU module (our compact module for smaller systems), but another ACL EVE 1 busboard can also be connected here. .
When using larger power supplies (featuring another power terminal), such as the ACL Bar PSU or ACL PSU-BG, the second power terminal, which has screw terminals for the supply voltages, can be used. Placing both power terminals centrally on the board further ensures maximum interference immunity.
All of this gives you maximum flexibility – multiple or single boards, large or small cases, any combination of modules, almost any power unit – without compromising the electrical characteristics of the board.
Of course, to take full advantage of the ACL EVE 1 busboard, we strongly recommend the use of a power supply with very low-noise/low-ripple characteristics. And without wishing to blow our own trumpet too much, might we suggest a supply such as the ACL KAZU PSU or the ACL Bar PSU / ACL-PSU-BG?
Dimensions : 5,3cmx1,2cmx37cm