User manual

17
2. Use of the USB-Cable
The enclosed USB cable should be connected to a 5-V-USB plug-in mains adapter
as it is used for charging mobile phones. Generally, connection to the USB output
of a PC is possible, but advised against. The reason: At accidental short circuit
when setting up the circuit, the current limitation in the computer (usually in the
form of a resistor) may be destroyed.
2.1 Connecting the USB Cable to the Plug Board
Test setup: Plug board, cable with USB-A plugs and pins, resistor 1 kΩ,
resistor 1.5 Ω, red LED
The USB cable can remain connected to the plug board for the following
charging experiments.
Plug the pin plug of the USB cable into the contacts of the plug board. Observe
that the plus pole of the pin plug leads to the upper current supply rail. Then
connect the pin connected to the red cable to the plus pole strip and the pin of the
black cable to the minus pole strip with the enclosed jumper wire (see gure). The
protective resistor at 1.5 Ω serves as a short-circuit protection in any case.
a) b)