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General infrared and ultrasonic circuits

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Ultrasonic switch

Ultrasonic switch

Circuit of a new type of remote control switch is described here. This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings.

http://www.electronic-circuits-diagrams.com/sensorsimages/sensorsckt7.shtml

Infrared Head Phones

Infrared Head Phones

Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place of a pair of wires, it uses invisible infrared light to transmit audio signals from TV to headphones.

http://www.electronic-circuits-diagrams.com/audioimages/audiockt3.shtml

Infrared Head Phones

Infrared Head Phones

Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place of a pair of wires, it uses invisible infrared light to transmit audio signals from TV to headphones. Without using any lens, a range of up to 6 metres is possible. Range can be extended by using lenses and reflectors with IR sensors comprising transmitters and receivers.

http://electronicsworld.tripod.com/audioimages/audiockt3.html

Visible and Infrared Light Detectors

Visible and Infrared Light Detectors

The sensors used are silicon phototransistors and Cadmium Sulfide (CdS) photocells. Both of these sensors allow less current to flow when they are dark than when lighted. Phototransistors change their conductance while photocells change their resistance depending on the intensity of the light falling on them.

http://home.cogeco.ca/~rpaisley4/PhotoDetectors.html

Infrared Sensor

Infrared Sensor

detects the move of the human being or the animal using the pyroelectric infrared sensor

http://www.hobby-elec.org/e_pyro.htm

Ultrasonic Alarm (1)

Ultrasonic Alarm (1)

This alarm transmits a ultrasonic and receives it after it is reflected at the obstacle and gives the alarm.

http://www.hobby-elec.org/e_sonic.htm

Ultrasonic Alarm (2)

Ultrasonic Alarm (2)

it gives the alarm when the object which is in the set distance passes away.

http://www.hobby-elec.org/e_soniarm.htm

40KHz TV-VCR infrared repeater

40KHz TV-VCR infrared repeater

http://www.discovercircuits.com/PDF-FILES/40kvcr.pdf

How Stuff Works: Bluetooth

How Stuff Works: Bluetooth

Concise description of the Bluetooth wireless technology, including problems and interference, with related links.

http://www.howstuffworks.com/bluetooth.htm

Infrared Imaging

Infrared Imaging

Learn about infrared imaging by viewing a variety of objects in the infrared.

http://www.ipac.caltech.edu/Outreach/Edu/Guess/


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