Dual comparators stabilize proximity Detector - 02/16/98 EDN Design Ideas: (File contains several circuits, scroll to find this one) Design by Arthur Harrison, US Army Research Laboratory, Adelphi, MD, and Joseph Stern, Maxim Integrated Products, Sunnyvale, CA
Frequency Emissions Detector - The F.E.D. (Frequency Emissions Detector) will, of course, detect anyone's cell phone, so the detector really responds to just about anybody with more than two pennies to rub together. Most phones occasionally transmit short bursts to the nearest cell tower, even when the phone isn't in use, so a typical 21st century loiterer will eventually set off the detector. On the other hand, a deer can stare at it for an hour with no effect. Let's face it, even most burglars emit digital signals these days. So, in a sense, the F. E. D. is a human detector. With that in mind, consider using the output to activate a digital camera or video recorder to capture a record of the prowlers. A recorded barking dog or, one of my favorites, a recording of police radio traffic will scare off most crooks. Add some hidden flashing red and blue lights to the police chatter and the culprits will actually run away. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
High-Speed Op Amp Enables IR-Proximity Sensing - 06-Aug-09 EDN Design Ideas: IR (infrared]-proximity sensors can sense the presence of an object, its distance from a reference, or both. Applications include speed detection, sensing of the hand in automatic faucets, automatic counting or detection of objects Design by Arpit Mehta, Maxim Integrated Products Inc, Sunnyvale, CA
Infrared beam barrier / proximity Detector - This circuit can be used as an infrared beam barrier as well as a proximity detector. The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & Vishay modules. For other modules please refer to their respective datasheets. The receiver consists of a 555 timer IC working as an oscillator at __ Contact http://www.tronicszone.com
Infra-red Level Detector - Useful for liquids level detection and proximity devices; Up to 50 cm. range, optional relay operation __ Contact Flavio Dellepiane, fladello @ tin.it
Infrared Motion Detector - Pyroelectric infrared sensor and associated circuits detect infrared radiation from human or animal body. General purpose motion detector with normally open relay output.16 pages. __ Golab.com
Infrared Proximity Detector - This proximity detector using an infrared detector (Fig.1) can be used in various equipment like automatic door openers and burglar alarms. The circuit primarily consists of an infrared transmitter and...__ Electronics Projects for You
Infra-Red Proximity Detector - The detector is intended for the recognition of obstructions at distances of a few millimeters to a few centimeters. Similar detectors are used in the industry and health services, for instance, to open a water tap via a magnetic valve. The sensor, IC 2, is a Type SFH900 optoisolator from Siemens or similar. A phase-locked loop__
IR Proximity Sensor - it is the same principle in ALL infra-Red proximity sensors. The basic idea is to send infra red light through iR-LEDs, which is then reflected by any object in front of the sensor. Then all you have to do is to pick-up the reflected IR light. For detecting the reflected IR light, we are going to use a very original technique: we are going to use another iR-LED, to detect the IR light that was emitted from another LED of the exact same type! This is an electrical property of Light Emitting Diodes (LEDs) which is the fact that a LED Produce a voltage difference across its leads when it is subjected to light. As if it was a photo-cell, but with much lower output current. __
Magnetic Proximity Switch - Here is an interesting circuit for a magnetic proximity switch which can be used in various applications. The circuit, consists of a reed switch at its heart. When a magnet is brought...__ Electronics Projects for You
Person Detector - This is a circuit thich I originally included in my book, 22 Tested Transistor Projects, published by BabanI Press in 1976 (iSBN 0 900162 63 S). it is one I had great fun with. it uses the PUT Complimentary Feedback Pair as a sensitive detector of changing electric fields to switch on an oscillator and make a noise. it is so sensitive that it can be difficult to get it working on a test bench because of all the electric fields, but put it on a table and leave it. __ Designed by Richard Torrens
Proximity Alarm - This simple circuit is sure to have the police beating a path to your door, however, it has the added advantage of alerting you to their presence even before their footsteps fall on the doormat. The circuit transmits on Medium Wave (this is the small problem with the police). IC 1a, together with a sensor (try a 20cm x 20cm sheet of tin foil) oscillates __ Designed by Rev. Thomas Scarborough
Proximity Detector - Here is a Simple but Very Effective One __ Designed by G.L. Chemelec
Radio Wave Alarm - This simple circuit is sure to have the police beating a path to your door, however, it has the added advantage of alerting you to their presence even before their footsteps fall on the doormat. The circuit transmits on Medium Wave (this is the small problem with the police). IC 1a, together with a sensor (try a 20cm x 20cm sheet of tin foil) oscillates __ Designed by Rev. Thomas Scarborough
RS-232C link Monitors animal activity - 11/06/97 EDN Design Ideas: A common need in biological experimentation is the ability to unobtrusively monitor the activity of small caged animals, such as mice, rats, and rabbits, as they move about their enclosures. This monitoring must be over long periods and around the clock. The circuit in Design by W Stephen Woodward, University of North Carolina--Chapel Hill
The F.E.D. Detects digital RF signals - The F.E.D. (Frequency Emissions Detector) will, of course, detect anyone's cell phone, so the detector really responds to just about anybody with more than two pennies to rub together. Most phones occasionally transmit short bursts to the nearest cell tower, even when the phone isn't in use, so a typical 21st century loiterer will eventually set off the detector. On the other hand, a deer can stare at it for an hour with no effect. Let's face it, even most burglars emit digital signals these days. So, in a sense, the F. E. D. is a human detector. With that in mind, consider using the output to activate a digital camera or video recorder to capture a record of the prowlers. A recorded barking dog or, one of my favorites, a recording of police radio traffic will scare off most crooks. Add some hidden flashing red and blue lights to the police chatter and the culprits will actually run away. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Ultrasonic Proximity Detector - We the humans can hear sound of up to 20kHz frequency only. This proximity detector works at a frequency of 40 kHz. it uses two specially made ultrasonic transducers: One transducer...__ Electronics Projects for You
Ultrasonic Proximity Detector 2 - This ultrasonic proximity detector comprising independent, battery-powered transmitter and receiver sections makes use of a pair of matched ultrasonic piezoceramic transducers operating at around 40 kHz each. This circuit can be...__ Electronics Projects for You
Versatile Proximity Detector with Auto Reset - Electrochemical processes taking place in our body generate complex sig-nals (hum) that are continuously being passed along the nerve fibres throughout the body. Any physical activity such as muscle movement increases...__ Electronics Projects for You
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