ANDREW PENG http://andrewpeng.net Unattended children will be given an espresso and a free puppy Fri, 18 May 2012 18:53:03 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 Zip ties to the rescue http://andrewpeng.net/posts/2012/05/111697-zip-ties-to-the-rescue.html http://andrewpeng.net/posts/2012/05/111697-zip-ties-to-the-rescue.html#comments Fri, 11 May 2012 15:50:23 +0000 andrew http://andrewpeng.net/?p=1697 With a coolant expansion tank failure on the Volvo, it’s zip ties to the rescue. Can they handle the heat? I’m pretty sure they can, I accidentally baked a few of them in the oven at 375 for about an hour and they showed no signs of discoloration or melting. This’ll work until I get the new coolant tank next week.

2012-05-10 18.44.24 2012-05-10 18.43.55 2012-05-10 18.36.04 ]]> http://andrewpeng.net/posts/2012/05/111697-zip-ties-to-the-rescue.html/feed 3 Headphone Amp Set in Clear Acrylic http://andrewpeng.net/posts/2012/04/231603-headphone-amp-set-in-clear-acrylic.html http://andrewpeng.net/posts/2012/04/231603-headphone-amp-set-in-clear-acrylic.html#comments Mon, 23 Apr 2012 14:58:26 +0000 andrew http://andrewpeng.net/?p=1603 I need to get a headphone amp for my Sennheiser HD280 Pros – maybe this will be my next project. A headphone amplifier assembled “dead bug” style, then set in clear acrylic. Yes. I want one.

Electronic engineers have been encapsulating or potting electronics in resin’s for decades usually for vibration dampening or moisture control its just I decided to make it look presentable :)

Source: Rupert Hirst / Runaway Brainz

]]> http://andrewpeng.net/posts/2012/04/231603-headphone-amp-set-in-clear-acrylic.html/feed 0 Discovery atop 747 http://andrewpeng.net/posts/2012/04/191594-discovery-atop-747.html http://andrewpeng.net/posts/2012/04/191594-discovery-atop-747.html#comments Thu, 19 Apr 2012 15:07:12 +0000 andrew http://andrewpeng.net/?p=1594

Space Shuttle Discovery mated with SCA NASA 905 chase flight from KSC – VAB in the background.

Source: NASA / Sheri Dunnette Locke

]]> http://andrewpeng.net/posts/2012/04/191594-discovery-atop-747.html/feed 0 Space Shuttle Discovery http://andrewpeng.net/posts/2012/04/171588-space-shuttle-discovery.html http://andrewpeng.net/posts/2012/04/171588-space-shuttle-discovery.html#comments Tue, 17 Apr 2012 15:44:09 +0000 andrew http://andrewpeng.net/?p=1588 I’m still upset that Houston didn’t get one. Thanks for the words, Engadget:

]]> http://andrewpeng.net/posts/2012/04/171588-space-shuttle-discovery.html/feed 0 Disable the camera shutter sound in the Google Nexus S 4G http://andrewpeng.net/posts/2012/01/311444-disable-the-camera-shutter-sound-in-the-google-nexus-s-4g.html http://andrewpeng.net/posts/2012/01/311444-disable-the-camera-shutter-sound-in-the-google-nexus-s-4g.html#comments Tue, 31 Jan 2012 22:05:10 +0000 andrew http://andrewpeng.net/?p=1444 Just wrote up a short how-to on how to disable the camera shutter sound in the Google Nexus S 4G – this requires superuser / root but otherwise is a 5 minute procedure.

]]> http://andrewpeng.net/posts/2012/01/311444-disable-the-camera-shutter-sound-in-the-google-nexus-s-4g.html/feed 0 Nice view up there http://andrewpeng.net/posts/2011/11/151378-nice-view-up-there.html http://andrewpeng.net/posts/2011/11/151378-nice-view-up-there.html#comments Tue, 15 Nov 2011 13:37:23 +0000 andrew http://andrewpeng.net/?p=1378 Update: Edited the embed because the original video was removed.

http://www.youtube.com/watch?v=Ip2ZGND1I9Q

 

When commercial space tourism becomes attainable (but not necessarily affordable), I’m going to have to see this for myself.

]]> http://andrewpeng.net/posts/2011/11/151378-nice-view-up-there.html/feed 0 Imperial March http://andrewpeng.net/posts/2011/09/291367-imperial-march.html http://andrewpeng.net/posts/2011/09/291367-imperial-march.html#comments Thu, 29 Sep 2011 15:49:10 +0000 andrew http://andrewpeng.net/?p=1367

http://www.youtube.com/watch?v=yHJOz_y9rZE

 

I thought it was appropriate.

]]> http://andrewpeng.net/posts/2011/09/291367-imperial-march.html/feed 0 If you put an airplane on a treadmill… http://andrewpeng.net/posts/2011/09/161353-if-you-put-an-airplane-on-a-treadmill.html http://andrewpeng.net/posts/2011/09/161353-if-you-put-an-airplane-on-a-treadmill.html#comments Fri, 16 Sep 2011 14:36:42 +0000 andrew http://andrewpeng.net/?p=1353 Estimate the mass of an Airbus A320 at about 170,000lb, start the accelerometer based dyno tool on the iPod touch, and wait for takeoff!

For the record, the estimation based on a 170000lb aircraft was 28596 hp

60′: 4.71 sec@18.5 MPH

1/8 mi: 13.89 sec@ 66.5 MPH

1/4 mi: 19.40 sec@94.2 MPH

A rather poor 1/4 mile time that most modern passenger sedans can outrun but keep in mind that while Mom’s Ford will stop accelerating at around 100MPH, this Airbus will continue accelerating until well past 500MPH.

]]> http://andrewpeng.net/posts/2011/09/161353-if-you-put-an-airplane-on-a-treadmill.html/feed 1 On HP Touchpad’s usefulness http://andrewpeng.net/posts/2011/09/161356-on-hp-touchpads-usefulness.html http://andrewpeng.net/posts/2011/09/161356-on-hp-touchpads-usefulness.html#comments Fri, 16 Sep 2011 09:26:08 +0000 andrew http://andrewpeng.net/?p=1356 I recently picked up an HP Touchpad at the firesale price of $150 for a 32gig model. This is by far the nerdiest thing I could do with it.

]]> http://andrewpeng.net/posts/2011/09/161356-on-hp-touchpads-usefulness.html/feed 0 Linux Network Interface Channel Bonding and DHCP http://andrewpeng.net/posts/2011/08/031345-linux-network-interface-channel-bonding-and-dhcp.html http://andrewpeng.net/posts/2011/08/031345-linux-network-interface-channel-bonding-and-dhcp.html#comments Wed, 03 Aug 2011 11:40:06 +0000 andrew http://andrewpeng.net/?p=1345 While configuring a few servers I noticed some strange behavior with mode 4 channel bonding (LACP / 802.3ad) and DHCP. You might get the following error message, no matter what you do:

Determining IP information for bond0… failed; no link present. Check cable?

The problem appears to exist in how the interface responds to link status on LACP / 802.3ad ports. The computer is trying to send DHCP packets when the interface itself isn’t ready, causing Linux to think the interface isn’t configured or has no network cable plugged in. This appears to only happen when you use mode 4 channel bonding. Mode 6 works fine. The (band-aid) solution appears to be to trick the system into thinking the interface is already configured. This enables Linux to continue sending DHCP packets until the interface is configured and negotiated successfully with 802.3ad, at which point everything works as planned. Simply insert this at the end of /etc/sysconfig/network-scripts/ifcfg-bond0 - I should note this particular example is for CentOS and RHEL so I haven’t confirmed if this workaround works for Debian based distributions.

check_link_down () { return 1; }

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