DIY Power Over Ethernet

Posted by barnoid Sat, 02 Aug 2008 20:34:38 GMT

DIY Power Over Ethernet
I got fed up with the power cable trailing in front of the bathroom door to my ADSL router so I rigged up this simple power-over-ethernet thing. 100Mbit ethernet only uses two of the four pairs in the cat5 cable so I wired the other two to carry the power (see diagram).
MakeCanon
ModelCanon EOS 40D
Exposure0.017 sec (1/60)
Aperturef/4.5
Exposure ProgramNormal
ISO Speed200
Date and Time (Original)2008:07:31 21:56:50
Exposure Bias0 EV
Metering ModeCenter Weighted Average
FlashFlash fired
Focal Length33 mm
Lens TypeEF-S18-55mm f/3.5-5.6

Binary Clock - block diagram

Posted by barnoid Fri, 29 Dec 2006 19:06:09 GMT

Binary Clock - block diagram
I attempted to make a binary clock as a Christmas present for scribe. It uses 4000 series CMOS logic ICs. This is a block diagram. It has a quartz pulse circuit which is divided down from 32768Hz to 2Hz by the 4060. This then drives a 4024 7bit counter for seconds connected to a 4 input AND gate, half of a 4082, which in turn drives the clock input of another 4024 which counts minutes. A similar thing happens for minutes to hours. Blue circles in the diagram indicate where the blue LEDs and accompanying resistors attach. The diagram doesn’t show where the switches for setting the hours and minutes attach. This circuit works fine when assembled on breadboard, but for some reason I haven’t yet worked out it doesn’t work when soldered on stripboard.