pmeerw's blog

Jan 2016

Mon, 04 Jan 2016

Unboxing TP-Link TL-POE10R PoE splitter

Got a TP-Link TL-POE10R Power-over-Ethernet (PoE) splitter (Ver: 4.0), complying with IEEE 802.4af; output is selectable: 5V/9V/12V into a 5.5mm OD, 2.1mm ID center positive barrel receptacle. Ethernet supports up to 1000Mbps.

It is not galvanically isolated and has a ground loop issue.

PCB top

There is a Feeling Technology FP5001 PWM (pulse width modulation) controller with SCP (short-circuit protection) / DTC (duty control); click to enlarge.

PCB bottom

There is a Linear LTC4257 PoE interface controller; click to enlarge.

Images courtesy Armin Langhofer.

posted at: 21:55 | path: /review | permanent link

Sun, 03 Jan 2016

Using nice symbols in Gnuplot

Use set term postscript enhanced to enable the enhanced syntax (local copy). Example:

set term postscript enhanced color lw 3
set output "nice.eps"

# produce \beta_1
set xlabel "{/Symbol b_1}"

plot sin(x)

posted at: 18:39 | path: /academic | permanent link

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