Uwes Blog

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LaborUSB

Many prototyping boards these days use USB Connectors as Power Source. For easy powering those devices with my DC Power Supply (or in german “Labornetzteil”) i created a adaptor from 4 mm banana plugs to 4 USB Jacks.

Additional benefit is that all types of iThings can be loaded with the Adaptor. The necessary research for loading Apple devices was done by Adafruit, see their page about icharging.

The device in action:

Usage of LaborUSB

Find all the files necessary to build your own on GitHub.

I have a few boards available, if you like to build your own, contact me.

Design

Schematic

The design is really simple and consists of only 4 resistors and 8 jacks. The real work was to make the mechanical dimensions fit for easy and fast assembly.

Schematic

Board

Can be easily done by every board house.

Board

Bill of materials

Parts

Count Description Source
2 Through-hole banana jack Black Reichelt
2 Through-hole banana jack Red Reichelt
1 Resistor 43K 0805 Distrelec
1 Resistor 75K 0805 Distrelec
2 Resistor 51K 0805 Distrelec
4 USB Jack Distrelec
1 Laser cut Front panel 3mm thick Formulor
1 Laser cut Back panel 3mm thick Formulor
4 Nuts 6mm Fine Pitch Thread
4 Screws M3 * 6mm
4 Screws M3 * 10mm
4 Hex Standoffs M3 * 12mm without Thread
4 Hex Standoffs * 5mm with Thread

Assembly

Solder Resistors

Resistors

Prepare Front Panel

Front

Place the banana jacks in the front panel and secure them with the additional 6mm fine thread nuts. Add one of the delivered 6mm fine thread nuts to every banana plug.

Add the 12mm standoff to the front panel with the M3 10mm screws. If you do not have 12mm standoffs, it is possible to replace the 12mm standoffs with a 10mm standoffs and a additional nuts.

Add board to front panel

Mounting

Place the board on the 12 mm standoff and secure it with the 5mm standoffs.

Mounting

Screw the 6mm nut up until the board is reached.

Mounting

Take the remaining 6mm fine threaded nuts and secure the banana plugs on the board.

Add USB Jacks

USB Jacks

With the USB jacks from Reichelt, you need to first straighten the outer pins as seen on the left jack. Otherwise they will not fit through the front panel.

Backplate

Place all 4 USB Jacks in the front panel and solder them to the board.

Add back panel

Use the 4 M3*6 screws and screw the backpanel in place.


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