Description The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker. The headphone amplifiers feature TI’s class G ground referenced architecture
Smartphone with Class G amp runs on 7mA audio chip Continue Reading
This Instructable is about how to create an Arduino PIR motion sensor for your room or office, using parts available from your local Radio Shack! Whether you’re looking for a cool and easy-to-build security sensor, or an awesome first project to dive into the world of Arduino, Microcontrollers, and electronics, this project is for you.
Arduino PIR Motion Sensor Continue Reading
Here’s how to build your own mini FM transmitter. It transmits FM waves so you could easily receive the signals on your mobile phone, radios, etc. As the name and the picture indicates it is very small and is approximately the size of a 9v battery clip. With this FM transmitter you could start your
Mini FM transmitter Continue Reading
Cambridge design consultancy Plextek has re-created two GaAs ICs for a US company with an obsolescence issue. The chips, described only as “GaAs control ICs”, were being dropped by their original manufacturer. “I suspect they are obsolete because of the MESFET process no-longer being available,” Plextek director of RF integration Liam Devlin told EW. “The
Resurrects Plextek obsolete GaAs ICs Continue Reading
These are the RFID readers I used. http://www.parallax.com/product/32390 Taking a snack brake while prototyping. 🙂 I think this code works, but I can’t seem to find the last version I made. AND YES I KNOW THE CODE IS REDUNDANT, I was just trying to make it work, I didn’t care how pretty it was. #include
Arduino RFID Card Door Lock System Continue Reading
Rechargeable batteries save us a lot of money but take a lot of time. What if you could recharge a battery in seconds instead of hours? Rechargeable batteries save us a lot of money these days but for the savings, we give up some of our time, waiting for them to recharge. What if though.
30 Second Charging, Rechargeable Battery Continue Reading
This is Part 2 of a series of blogs regarding the development of a wall-mounted server based on the Raspberry Pi, featuring WiFi and a colour touchscreen. Part 1 can be found here. The enclosure I’m using, a re-purposed room thermostat casing, places some very tight constraints on the dimensions of the Raspberry Pi and
Pi On The Wall – wall mounted home server Continue Reading
Build a DIY geiger counter that uses a PIN photodiode as a substitute for an expensive Geiger-Mueller tube. It detects alpha and beta radiation particles. The circuit is soldered onto a small protoboard and everything is placed in an aluminum enclosure. Copper tubing and a piece of aluminum foil is used to help filter out
Pocket Photodiode Geiger Counter Continue Reading
Have you ever wanted to broadcast your own radio station within your neighborhood? Ever get curious on where people get those “Surveillance Bugs” from spy and action movies? This small and simple FM transmitter is the toy that geeks have always wanted. FM transmitters can be complicated to build, that’s why I’m teaching you how
The Ultimate FM Transmitter (Long Range Spybug) Continue Reading
This waveform generator is based on the work by Amanda Ghassaei. Waveform generators (or function generators) are used for testing and debugging circuits. e.g. frequency response of op amp or sensors. This waveform generator is powered by Arduino with Annikken Andee shield – a device that lets users create iOS/Android interfaces without iOS or Android
IOS-Controlled Arduino waveform generatora Continue Reading
