A very useful device not only for makers.
The four lines 5V,GND,D+,D- can be individually switched ON or OFF (connected or disconnected).
Look at the pictures, it's pretty self-explanatory...
Charging (or power supplying) a device (e.g. your mobile / mp3-player / camera) with an "unknown" PC or the PC in your office/company/at your employer.
You don't know if this PC "scans" all your private and confidential data,
you don't know if this PC is "infected" with some virus or malware !
Simply switch off the 2 data-lines (D+ and D-) on the USB-Helper and you are protected.
Sometimes you want to communicate with a device but without connecting the 5V from the PC.
(quite often the 5V-supply from a PC is very noisy, with voltage spikes or some humming occurs...)
-- communicating with a microcontroller system that has it's own power supply (3.3V / or own 5V-System)
-- using USB audio systems (e.g. external D/A-converter) with own power supply without "injecting" noises and humming from the PC.
Simply switch off the 5V-line on the USB-Helper and you are ready to go.
(in some scenarios even the GND switch can be disconnected as well, you have to try)
you will get a kit which consists of the following parts (see pictures):
This is open source hardware in terms of the definitions of oshwa.org
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One-man hobbyist* maker shop with a focus on value-added PCB-based products,
useful as tools helping other makers, like breakout boards, shields, small microprocessor boards (mostly ATMEL), and more stuff ...
*(I am/have not a company/business)
The bare PCB itself is made in Europe, the assembling (SMT / reflow) is done by myself.
Most of my products are open source hardware (according to -> http://oshwa.org).
PCB development is done with EAGLE (-> https://cadsoft.io).