QuinLED-Dig-Octa System

Lots of projects need power, especially LEDs! For this I have designed several powerboards which can be used to distribute and safely use the required power.

The power-7 is available in a normal (50Amps) and HC (High Current) 100Amps version, this article is about the normal version.

[board shot]

[board shot with connected cables]

Design Goal

The power-7 is built with 4 banks of 8 times a 7.62mm screw terminals. Comprised of 2 separate positive banks and 2 separate negative banks which are divided over 3 sides of the board. Because of this it will in some cases require a slightly longer wire then for instance on the power-5 where + and – are right next to each other.

The power-7 in the series of powerboards has been designed for high terminal density providing up to 16 fused outputs. The downside is that this required normal screw terminals and that in turns means is not well suited to be stacked unless used as the top board. (Brainboards do not obstruct the screw terminals and output fuses)

All input and output terminals are equipped with individual fuse sockets allowing you to select the individual value fuse per output terminal.

The normal version of the power-7 has 3x 9.5mm barrier terminal blocks for input of power allowing for connecting up to 3x parallel wires from a single power supply to minimize voltage drop between the power supply and the powerboard.

Advised Power Supply

This board is ideally suited to be used with a Meanwell LRS-350-5 (60Amps @ 5v) or LRS-600-12 (50Amps @ 12v) power supply.

*Connecting multiple power supplies to a single powerboard is not allowed, if you wish to use multiple power supplies (even with different voltages) this is allowed within a stack so will require multiple boards.


  • 3x 9.5mm “barrier block” input terminals for both positive and negative
    • Allows power input wires using
      • Bare wire
        • Also when soldered (not recommended)
      • Wires with crimped on wire ferrules
      • Wires with crimped on fork style crimps (preferred)
    • With the right style fork crimps allows for up 3x 6AWG input wires
  • Board recommended max 50Amp continuous load total
    • Fore more detailed power handling rules please see the following article
  • 16x 7.62mm output screw terminals
    • Allows up to 12AWG/3.3mm2 cable with ferrule
    • + and – negative are divided on the board in banks
    • Fuse socket per output
    • Max 10Amps fuse recommended
  • 5v-24v capable
  • “Broken Fuse” light per output
    • Custom independent “constant brightness” circuit
  • Onboard capacitors
    • Features 2x 1500uF 35v big capacitors
      • Smooths high transient loads and voltage spikes
    • Per output 1uF 50v capacitor
      • Provides noise filtering on output ports
  • Onboard Voltage display
    • Shows actual voltage including potential voltage drop
    • Easy to identify voltage of powerboard in a mixed voltage stack!
  • 4x M3 mounting holes
    • Connected to GND


  • Equipped with QPowerPost feature
    • Allows sharing power from powerboard to brainboard stack
      • Output only
    • Fully protected (Max 1.5Amps out, PTC auto-reset fuse)
    • 5x M2.5 screw holes
      • Outer 4x GND
      • Inner 1x VCC
  • Extra 1x 5.08mm pluggable terminal
    • Provides VCC and GND out
    • Protected against input and max 1.5Amps (PTC auto-reset fuse) current
    • Ideal for hooking up brainboard if you do not wish to use QPowerPost
  • Double up feature
    • If more power (up to 20Amps) or a thicker cable is required, using a SV5.5-5 fork crimp 2 positive and 2 negative output terminals can be combined allowing up 10AWG/5.2mm2 cable to be connected over 2 output ports

Suggested handling capabilities

Please see this dedicated article for the power handling capabilities and suggestions.