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Pick: Up Phone Interface

Portable Cell-Phone Battery Charger
2 Comments - in Telephone
A very clever portable cell phone battery charger that uses 8x1.5 AA cells (batteries) to charge cell-phone / mobile phone batteries while mobile. No more need for a mains outlet!
Mobile Phone Incoming Call Detector
5 Comments - in Telephone
A simple circuit that flashes an LED when a cell phone has an incoming call. Uses a coil to pick-up the signal emitted during an incoming call event. Cell phone call detector.
Photo: Outgoing Phone Number Logger Kit Outgoing Phone Number Logger Kit
Recorder all outgoing dialed numbers on your phone with this electronic kit.
5 Useful Telephone System Circuits
0 Comments - in Telephone
Features a telephone ring generators, phone line in-use indicators and an audio interface circuit.
Photo: USB Interface Board - (Universal Serial Bus Circuit) USB Interface Board - (Universal Serial Bus Circuit)
Allows for connection to Personal Computers USB (Universal Serial Bus)
Photo: Cellular Phone Sound Effects Cellular Phone Sound Effects
Easy to build sound effect generator kits, inludes several different sounds and tunes.
Visual and Audible Alert For Incoming Telephone Call Circuit
0 Comments - in Telephone
Electronic circuit that connects to phone line and produces and flashing LED and audible sound when there is an incoming call.
Photo: DTMF Tone Grabber Kit DTMF Tone Grabber Kit
The kit will detect DTMF tones from a telephone line or via an onboard microphone and display them on a 16 character, single line display.
Photo: IBM Compatible Robot Arm Interface IBM Compatible Robot Arm Interface
Teaches the fundamentals of a basic robotic sensing and locomotion principles while testing motor skills. Includes 5 switch wires controller to grab, release, lift, lower, rotate wrist, and pivot sideways 120°. Transparent arm shows the state-of-the-ar
Photo: High Power FM Transmitter High Power FM Transmitter
A powerful little circuit with surprisingly good audio quality. Can transmit up to 1/2 mile in open spaces. This is one of the most powerful FM transmitters that you can legally purchase. An electret microphone is used to add sensitivity. The circuit come
Photo: Audio Recorder Module with 20 Seconds Memory Audio Recorder Module with 20 Seconds Memory
Recorder that can store up to 20 seconds of voice/sound