Broadcast Engineer at BellMedia, Computer history buff, compulsive deprecated, disparate hardware hoarder, R/C, robots, arduino, RF, and everything in between.
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RIP clumsy stormtrooper Michael Leader

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https://www.youtube.com/watch?v=Ja4v-qiFvBg

Michael Leader, famous in certain circles as a clumsy Star Wars stormtrooper who knocked his head on a door, has died. He was also known for playing the longtime milkman character in UK soap Eastenders.

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tekvax
2 hours ago
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Burlington, Ontario
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Tobin's Spirit Guide

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"The architect's name was Evo Shandor. I found it in Tobin's Spirit Guide. He was also a doctor, performed a lot of unnecessary surgery. And then in 1920, he started a secret society... " -- Dr. Egon Spengler

If you are a Ghostbusters fan, you've been hoping, since 1984, to get your hands on a copy of Tobin's Spirit Guide. Here it is!

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Fantastically illustrated by Kyle Holtz, and written by Erik Burnham, Tobin's Spirit Guide shares the backstory of many familiar Ghostbusters ghosts and demons. From Class 5 Free Roaming Vapors to Vigo the Carpathian, they're all here!

Certainly a fun book to have in your collection!

Tobin's Spirit Guide via Amazon

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tekvax
2 hours ago
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Burlington, Ontario
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Rare red sprites dancing in the skies, above thunderstorms

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Graduate student Jason Ahrns captured a stunning image of red sprites over Nebraska while aboard a plane chartered by the National Center for Atmospheric Research. And behold Scott McPartland's rare video of the phenomenon in May. (more…)

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tekvax
3 days ago
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Burlington, Ontario
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Homebrew Multimode Digital Voice Modem (MMDVM) adapter

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Florian Wolters made his own version of MMDVM adapter:

During experiments with digital voice mode in hamradio I discovered a nice project describing an adapter for D-Star, DMR and other digital modes based on an Arduino Due and a little PCB to be put on top. This unit is called the Multimode Digital Voice Modem or MMDVM (see [1]). It seems that this is getting quite popular because hard- and software is Open Source.

Check out the video after the break.

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tekvax
8 days ago
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Burlington, Ontario
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Contactless transit card teardown

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A RFID transit pass teardown from Electronupdate:

Here is the die photo: super tiny. I bet they get thousands of dice off of each wafer. Looks like it’s a protocol called MIFARE. Vendor of the chips is NXP. I think it’s their ultra light family
The amazing bit is that a card is printed with conductive ink, a semiconductor added (with a transistor count in the tens of thousands), a vendor-specific ID placed on the outside with another layer of paper, spooled in to giant rolls, vended for a single trip and then thrown away…..

More details at Electronupdate blog.

Check out the video after the break. 

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tekvax
8 days ago
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Burlington, Ontario
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25 watt hybrid EL84 tube amp

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Ray Ring from Circuit Salad has published a new build, 25 watt hybrid EL84 tube amp:

This is my new  hybrid guitar tube amp which utilizes a solid-state input stage, DSP reverb, and solid-state phase splitter. Only the push pull, class AB output stage utilizes tubes, namely two EL84’s run at 390 volts with cathode bias. The bias uses two 15 volt zeners which creates a bias current of about 26mA. This requires almost 30 volts of swing on the grids to drive the amp to saturation. This is accomplished with a little switch mode boost converter that generates 29 volts to drive the phase splitter opamps. All of the solid-state circuitry runs off the AC filament supply for the tubes. The solid state portion is basically my stomp amp design( also on this blog) minus the final power amp, which is replaced with the phase splitter.

More details at Circuit Salad’s homepage.

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tekvax
8 days ago
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Burlington, Ontario
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