HOW TO – Build a speech scrambler
Build a Security 1 (speech scrambler) from Popular Electronics March 1970 – Link.
Technology
HOW TO – Sound transmission using light
Here are a couple simple circuits you can build that will transmit sound using light across short distances, one using a LED you can see and another using invisible IR (infrared). Sound transmission using light – Link. Infrared voice link- Link. Related: Transmit Audio with a Laser Pen – Link.
HOW TO – Make an alarm clock loudener
Info_Kill writes – “A reliable (modified) alarm clock that will wake the dead. I put this together after having several wind-up alarms break on me. It’s basically an electronic alarm clock modified to trigger an alarm bell. Since I’m pretty much comatose when I sleep this is just what I needed. “ – Link. Perfect […]
Omniteuthis – Amazing robot with a holonomic drive
Mr_tentacle writes – “Omniteuthis is a 3-wheeled test platform with holonomic drive – omniwheels at the the corners allow it to move directly in any direction. A Robot Logic OMX-3 omni-mixer and an inexpensive rate gyro work together to make it more-or less driveable using a 2-stick heli radio… Omniteuthis features 3 omniwheels mounted at […]
HOW TO – Make a HI-FI Stereo FM transmitter
Here’s how to make a high quality stereo FM transmitter – “Whether you want to create your own radio station, transmit the music around the house, or simply create a wireless link between your iPod and a receiver in your car, this transmitter will let you do these things easily. With BA1404 HI-FI Stereo transmitter […]
Laser cut – Palm Pilot robot
Chris writes – “This is my version of the Palm Pilot Robot from the Robotics Institute at Carnegie Mellon. Their website has a simple tutorial on how to make one and even has programs to download and bring it to life. I used this opportunity to figure out the ins and outs of the laser […]
HOW TO – Make custom backgrounds for the Sidekick III
One of the things that’s not so cool about the new Sidekick III is the lack of customization (for example you can’t use your own MP3s as ring tones) – but here’s how to change some of the backgrounds, icons, sounds and splash screens by making a “themes” folder and using a text file / […]