While designing the Linear Power Supply PCB, I forced myself to keep dimensions within the 10 cm x10 cm limit in order to keep board costs low. When I realized that only 4 power connectors could be accomodated in the remaining space (3 in the final design, see next step), I decided to draw an auxiliary board: a power BUS bar.

This is a very simple design, made of 4x10 pins and 4x16 pins IDC connectors, all respecting the eurorack pinout.

The BUS board also has solder pads for each required voltage (+12V, -12V, +5V, GND), so that you can use it with any external power supply of your choice.

Design Improvements

Even if the layout is essentially unmodified from the one pictured, there was room for three LEDs and three corresponding current limiting resistors. This gives the user a visual feedback of the presence of the three DC voltages (+5V, +12V and -12V), a welcome addition especially if the Power Supply doesn't have any.

PCB file I am sharing here already adopt the LEDs improvement ;)

Read the full story at this link: https://www.pcbway.com/project/shareproject/ALR400___DIY_Linear_Regulated_Eurorack_Power_Supply.html