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Tag: mobile

Cat Links Personal Project, Servers & Services

Securing The New Server & Security In General

Posted on April 3, 2017May 1, 2017 The Engineer

This was originally going to be part of another post, but it ended up getting more complex than I originally intended so it’s been given it’s own. I go into into many of my personal security practices, on both my public facing servers & personal machines. Since the intertubes are

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Cat Links Teardown

Topping NX1a Portable Headphone Amplifier

Posted on March 2, 2017April 24, 2017 The Engineer

Time for another teardown! Here’s a pocket-sized headphone amplifier for use with mobile devices. This unit is powered by a built-in lithium cell, and can give some pretty impressive volume levels given it’s small size. The 3.5mm audio input & output jacks are on the front of the unit, along

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Cat Links Randoms, Teardown

Pancake Vibration Motor Teardown

Posted on December 27, 2015 The Engineer

For a while I’ve wondered how these pancake type (AKA “Shaftless”) vibration motors operate, so I figured I’d mutilate one to find out. These vibrators are found in all kinds of mobile devices as a haptic feedback device, unlike older versions, which were just micro-sized DC motors with an offset

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Cat Links Hacks, Personal Project, Randoms

Cheap Lithium Polymer Battery Packs

Posted on December 8, 2015 The Engineer

In the past, I’ve used RC type LiPo packs for my mobile power requirements, but these tend to be a bit bulky, since they’re designed for very high discharge current capability – powering large motors in models is a heavy job. I recently came across some Samsung Galaxy Tab 10.1

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Cat Links Randoms

New Radio – Baofeng UV-82

Posted on July 31, 2015 The Engineer

Thanks to Lewis over at Distant Signal Radio, the bad influence he is on my bank balance ;), I’m the proud new owner of a new Baofeng. This time it’s the UV-82. This radio is a little different from the other Baofengs I have. Here are the main differences: Dual

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Cat Links Ameteur Radio

Stock Baofeng Antenna Problems

Posted on July 25, 2015July 28, 2015 The Engineer

Recently I’ve noticed my usual mobile rig, the Baofeng UV-5R, has had very poor receive, and non-existent transmit. I did a power test on the radio, and confirmed it was still outputting it’s rated RF power. Trying another antenna proved that the radio was fine. Time to tear down the

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Cat Links Randoms

QSO Logging Systems

Posted on July 20, 2015July 20, 2015 The Engineer

As per my site update post, I have migrated my radio log onto a new system, from CQRLOG. CQR log has served me well since I first started in Amateur Radio, however it’s a bit complex to use, requires a backend MySQL server for it’s database, and as it’s a

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Cat Links Randoms

Some Site Changes

Posted on July 19, 2015 The Engineer

After a few years of running with the same look, I’ve decided on some changes. New theme! The site now looks much better, and has better support for more eye candy 😉 Addition of my QRZ link New QSO logging system Accessible from a button in the header, this is

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Cat Links Hacks, Personal Project

Mobile Power Pack Upgrade

Posted on August 12, 2013 The Engineer

The original LM2577 based regulators I designed into my mobile battery pack turned out to be insufficient for requirements, therefore they have been replaced with higher capacity regulators. The 12v regulator (left) is a muRata UQQ-12/8-Q12P-C SEPIC converter, providing a max of 8A at 12.1v DC. The 12v rail is

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Cat Links Consumer Gear

Nokia 7110

Posted on August 26, 2010 The Engineer

Another phone from the mid 90s. This is the nokia 7110. Here the slider is open showing the keypad. Here the battery is removed, a Li-Ion unit. The battery cell & protection circuit removed from the casing. This is the rear of the PCB removed from the housing. Data &

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