http://www.hoffmanonline.com/stream_document.aspx?rRID=233309&pRID=162533
Good read.
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Electronics Archive
Heat Dissipation in Electrical Enclosures; FanBlower Selection and Sizing
Posted May 11, 2015 By Landis VARDUINO SOLAR CHARGE CONTROLLER (Version-1)
Posted March 13, 2015 By Landis Vhttp://www.instructables.com/id/ARDUINO-SOLAR-CHARGE-CONTROLLER-PWM/
Filed in Electronics, Energy, Fabrication, Hobby Engineering, Links, Projects, Wireless | Tagged: to read
Recent mini-PC/router devices of interest
Posted January 5, 2015 By Landis VRockTek RT-A1, priced at $65 on NewEgg Flash on 1/5/15. Quad core, HDMI output up to 2048 x 1536. Appears to be only a 10/100 ethernet, but has a couple of USBs to which GigE adapters could be connected for up to 480Mbit theoretical throughput. Also has a composite video out, which could theoretically be paired with one of these 4.3″ LCD “backup camera” displays for a convenient method to apply updates, etc. Caveat is that there does not seem to be much hackery on it to run Linux natively, but it is tempting to pick one or two up to play with and see what could be done.
Also ran across this Foxconn AT-5570 (manufacturer page here, also on sale at NewEgg Flash for $90, though it would need to have RAM and storage added). Higher price and lower performance would make this somewhat less appealing.
The Foxconn was perhaps most interesting because it led me to the Jetway motherboards with multiport ethernet daughterboards. This auction page had a six port GigE model. The four port daughterboard is the Jetway ADE4RTLANG, and several of the Jetway mini-ITX mainboards include dual ethernet ports natively. Quite a bit higher priced, but might prove useful at some time.
Also interesting was the Odroid-C1 currently selling at the same price as the RPi, and their intro/getting started kit with the required SD card as well as a breakout board and some basic electronic components to get familiar with the device is on sale for under $70 through January 7th when paying with PayPal. The C1 is, I believe, almost pin-compliant with the header on the RPi. It has a quad core 1.5GHz processor, 1GB DDR3, and a gigabit ethernet interface.
Filed in Android, Electronics, Hobby Engineering, Links, Linux, Networking, Projects, Technology, To Buy | Tagged: linux, price comparisons, Technology
Ringing in 2015 with 40 Linux-friendly hacker SBCs · LinuxGizmos.com
Posted January 3, 2015 By Landis Vhttp://linuxgizmos.com/ringing-in-2015-with-40-linux-friendly-hacker-sbcs/
Pretty good board list, including a couple with dual ethernets, which is something I’ve been wanting to have.
Filed in Communications, Electronics, Hobby Engineering, Internet, Links, Linux, Monitoring, Networking, Projects, Technology, To Buy | Tagged: linux, Technology
Asus RT-N16, possible capacitor issue
Posted December 8, 2014 By Landis VI’ve been using an Asus RT-N16 router with Tomato firmware for just over two years now, and the other day it died on me. It would power up for just a second or so if I unplugged and re-plugged it, and I confirmed it wasn’t just a bad transformer with another 12V/1A power supply I had around. I was able to swap in a Netgear 3400 I had on hand and get back online quickly so I didn’t need to worry about it, but wanted to see if there was anything I could do with the N-16 as it has worked very well… and has all my config in it :/
Top view of swollen capacitor on Asus RT-N16.
The whole family was sick today, so I finally had a chance to dig into it a bit. I first checked the warranty and see that I’m a couple of months past the two year point (purchased in July 2012), so I went ahead and opened it up. Upon doing so, I discovered a slightly swollen 680uF 16V capacitor near the power connection. A bit of Googling seems to indicate this is a pretty common problem (here, here, and here are just a few samples), so I’ll have to do a little scavenging and see what I can come up with for a capacitor.
Side view of swollen capacitor on Asus RT-N16.
Arch Linux ARM • View topic – Pogo V4 A101 Mobile Hardware Mods?
Posted July 12, 2014 By Landis Vhttp://archlinuxarm.org/forum/viewtopic.php?f=53&t=6040
I picked up a couple of POGO-V4-A1-01’s from eBay for $7.50 apiece shipped and thought I might try using them for sensor devices and/or generic simple alerting systems. The hardware mod listed in this forum will be very helpful in adding another interface to the device, as my understanding is that it will only boot from the USB or the SATA port, and the device will be much more useful if the USB port is available for peripherals.
