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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

Master Category List - Dave's Circuits

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RFID Circuits

125khz Wireless Smart Key Detector  -  This circuit will turn on an indicator light whenever it detects a smart car key containing an RFID chip . . . [Circuit by David Johnson P.E.,  07/11/06]


Optical RFID Test Circuit  -  I designed this test the concept of using light techniques to send identification data instead of RF. A more detailed discussion on this scheme can be found in the Imagineered new products section . . . [Circuit by David Johnson P.E.,  02/11/02]

RFID Smart Key Detector  -  The hobby circuit below was designed to indicate if a key held over the small coil of wire contains a 125KHz RFID chip. These chips are often used in smart car ignition keys.  The left side circuit forms a 125KHz power oscillator, which drives the 680uH a . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]


RFID Test Circuit  -  I designed this test the concept of using light techniques to send identification data instead of RF. A more detailed discussion on this scheme can be found in the Imagineered new products section . . . [Hobby Circuit designed by David Johnson P.E.,  02/11/02]


Wireless RFID Smart Key Detector  -  Many cars now use a key with an imbedded RFID microchip.  The microchip is read when the key is inserted into the carís ignition.  The keys containing a microchip often look the same as most other keys. People duplicating car keys will often not know of the microchip.  This circuit will light a LED if it detects a key containing a 125KHz RFID chip. . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/09/06]


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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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