EEVblog No Script, No Fear, All Opinion

Dave investigates the ionic electro-chemical resistance of some Alkaline batteries under light multimeter input loading and an unusual physical battery phenomena, and explains how it differs drastically from the datasheet internal resistance value. He also finds a surprising result showing two types of Alkaline battery construction with different properties. It …

What’s inside a modern bare bones $5 mobile phone? The LG800G available from Tracphone for $5: Datasheets: http://www.infineon.com/dgdl/X-GOLD_213-pb.pdf?folderId=db3a304312fcb1bc0113000c158f0004&fileId=db3a30431ddc9372011e1fc7f7fd413d http://www.rfmd.com/CS/Documents/7161DS.pdf http://en.wikipedia.org/wiki/High-electron-mobility_transistor http://www.broadcom.com/products/Bluetooth/Bluetooth-RF-Silicon-and-Software-Solutions/BCM2070 Forum HERE Podcast: Download

Mailbag galore. Dave screws up and releases the magic smoke on the best mailbag item ever. Turns a light bulb on with his mobile phone, and goes underwater in a submarine. And a cameo appearance by everyone’s favorite. http://shackspace.de/ http://lightdream.com.au/ http://www.avbotz.com/ http://jmedved.com/usbamps Podcast: Download

Dave started out wanting to investigate the power-on spike on the Rigol DP832 Lab Power Supply, but ended up hunting down a reset bug that uncovered a bad thermal design mistake in the supply. Watch Dave hunt it down step by step, and almost get duped by some marginal oscilloscope …

The draw for the Hameg analog/digital oscilloscope.

What’s inside the Rigol DP832 precision lab power supply. Is it identical to the DP832A Photos HERE Forum HERE Podcast: Download

Mailbag is back. With bonus soldering and breadboard action, and Whia vs Swisstools shootout! The Postcards: https://www.youtube.com/watch?v=NjnZeFE_3Cs http://www.azoteq.com/ Capacitive touch sense IC’s http://gerrysweeney.com/ Podcast: Download

I’ve been told it’s official, the µRuler campaign is the most supported in Pozible history! It has almost cracked 1000% funded with over 1700 supporters! Thanks guys, this is both awesome and frightening. Only a day or so left to get one if you want it:

Dave gives his initial impression on the Rigol DP832 triple output 195W lab power supply. Forum HERE Podcast: Download

Due to many requests I’ve finally made the µRuler available through a crowd funded campaign on Pozible: www.pozible.com/project/31806 So if you want a few of them, get in quick before the campaign ends. If it makes the target, the rulers get made, otherwise, they don’t.

Can you determine the charge of an alkaline battery by simply dropping it and see how high it bounces? A followup to the KipKay video It seems KipKay’s video is just a ripoff of this earlier ONE Podcast: Download

Dave tears down and attempts repair on a 1989 vintage Acorn Archimedes A3000 Computer, using the very first ARM processor, the Acorn RISC ARM v2 Service manual HERE Reference Manual HERE Schematics HERE Forum HERE Podcast: Download

How to capture and reverse engineer an infrared IR code and use an Arduino or other microcontroller to replay the command. Oscilloscope and logic analyser capture, coding, troubleshooting, tounge angle, it’s all here. In this instance Dave captures the NEC (Japanese) code from his Canon video camera remote control on …

T-Shirts: 555 Timer Negative Feedback Fluxgate Condenser

Dave wires up an Arduino (Freetronics Eleven) to control his video camera via a learning IR remote control matrix keypad. NOTE: this is NOT an optimised solution, nor a tutorial on the best way to do this, it’s a quick rudimentary hack while showing a few traps. This was the …