Three-minute history of telephony

2014-11-11 04:44 by Ian

This is something I wrote for some coworkers in an effort to describe why the telephone signalling system is full of what appears to be arbitrary cruft and inconsistency. I thought it might be worth poasting.

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How to properly abuse a prioirty queue

2014-10-20 13:16 by Ian

My collection of C++ classes has grown to include a priority queue template. Here is that template, and an example of how to make it do something it wasn't written to do: Calculate statistical mode.

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Durango-Silverton Trip

2014-09-13 16:05 by Ian

Photos from recent trip.

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Crosspoint Audio Router with Volume Control

2014-05-27 00:35 by Ian

I've been needing this part for a long time now. So I've finally gotten around to doing the design work and making a production-worthy module.

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Workbench

2013-12-10 17:25 by Ian

Enough visitors to my home have taken pictures of my workbench to convince me to put pictures and descriptions of things online.

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Secondary battery and isolator installation

2013-11-26 00:29 by Ian

I bought a 250A battery isolator on ebay for $70, but when the thing arrived, I realized that I had a serious problem on my hands. The thing was too long to fit in any convenient mounting location. So I had to get creative.

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The front panel

2013-09-14 08:40 by Ian

The front panel is the replacement face-plate for the radio box. It is the base of the user interface for the car computer.

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Locker Override and Undercarriage Lighting

2013-09-14 00:24 by Ian

As far as I can tell, this blank space next to the DC power outlets has no purpose intended by Jeep. So I defined a purpose for it.

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Android --> GZip --> PHP

2013-09-11 21:36 by Ian

Sometimes, you need your android app to ship a large volume of data to a server, and bandwidth is more important than CPU. I ran up against this recently while working on a log-dump function. If the user tries to upload 5000 lines of log, it might be several megabytes of low-density data going over his line.

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The top plate

2013-08-23 01:50 by Ian

The top plate in the radio box holds the bulk of the custom circuitry for the car computer. Mounted to it, we have the public address (PA) amplifier, the DC/DC for the amplifier, my hand-built filter and audio-level shifter, the main CPU board, the audio board, and a handful of regulators and MOSFETs.

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