You never know what radio signals you might pick up if you just stop and listen. That's why Hans built a simple and tiny receiver capable of detecting QRSS (extreme slow speed continuous wave) transmissions on a fixed frequency, such as 10.14MHz. The device is powered by a computer's USB port and the audio output feeds into the PC's sound card and it can hook straight into a laptop for top secret missions. Hans used a toroidal transformer as matching and input filter, connected directly to a 30m (10MHz) dipole antenna and a useful oscillator/mixer IC as a crystal oscillator and mixer.
Please click on the 'continue reading' link below for complete build instructions and parts list.
Continue reading "Hans knows the truth is out there" »
This one caught my eye recently. Call it what you will - telepresence, augmented reality or head-mounted computing - this headset with connected video source is a home-brewed
Linux-based system.
Thanks to
Engadget (and
Hack A Day) for flagging this one, and kudos to one Pascal Brisset for building the device.
Continue reading "Head-mounted video system runs on Linux" »
'
I'm a car starter. A cellphone car starter...'
With a mobile phone-based car-starting device we are continuing a theme here - back in January we highlighted the work of Gadget Master Alvaro, who wanted to take control of his gadgets, via an SMS Remote Controller. See
Taking texting control of your gadgets.
Thanks to
Engadget for highlighting this $10 DIY device made by Dave, as a possible alternative to much more expensive car-starter systems, like
Viper. It's interesting, but falls into the '
Don't Try This At Home' category!
The website writes:
Continue reading "Dial a car to start up its engine " »
On another blog, a reader recommended a post in a blog by
homo ludens electronicus - and what a blog it is! - see
Power Inverter has more than a screw looseWell, there's plenty more there to highlight to Gadget Masters.
Take for example his detailing of a project to
build a small AM transmitter.
He begins:
I needed a small transmitter, which would allow me to transmit good, old music into my AM-only radios. So, one Saturday afternoon I got into gear, designed and built a very crude, terribly non-optimized little transmitter. It's almost a joke expressed in electronics, full of poor design, so please don't think that this is the best I can do! You must see it as a quick and dirty 5-hour effort, because that's all the time the transmitter took to design, build, and test. Making this web page about it is taking much longer! I'm putting this thing on the web only because many people have asked me to do so, despite its crude design!
Continue reading "New music into old radios - build your own AM transmitter" »
I see that Julian Horsey on his Geeky Gadgets blog has had the spotter cameras out and found an inexpensive flying drone to keep an eye on things.
The camera drone is called the Eye3 and it has been designed by Kellie Sigler as "a professional quality yet affordable" camera in the sky.
We are told the design kit is "easy to assemble".
Continue reading "Low-cost drone that's ready to fly" »
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