RFID Circuits free electronic circuit links

RFID Circuits, Page 2
RFID Circuits: #'s - N M - Z
Last Updated on: Friday, March 12, 2010 12:08 PM

Circuits Designed by Dave Johnson, P.E.:

MEDIUM POWER 125KHZ OSCILLATOR
This circuit is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR but adds more invertors in parallel to deliver more power. The values shown are for 125KHz.

MEDIUM POWER 125KHZ OSCILLATOR-2
This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz.

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.

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 car’s 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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Medium Power 125kHz Oscillator - This circuit is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR but adds more inverters in parallel to deliver yet more power. The values shown are for 125KHz. ….(designed by David A. Johnson)

Medium Power 125kHz Oscillator-2 - This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz. ….(designed by David A. Johnson)

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. ….(designed by David A. Johnson)

Passive RFID Basics - Microchip Application Note Published 13-Apr-99 (app note added 2/06)

RFID Coil Design - Microchip Application Note Published 29-Sep-98 (app note added 2/06)

RFID Demokit 125kHz - Transceiver including antenna for reading and writing, where possible, the 125kHz transponders EM4100, EM4102, EM4105, EM4150. Includes 2 tags each using the EM4150 and EM4100 and demonstration software. (added 3/05)

RFID Reader Handheld - Intersil Application Block Diagram (app note added 6/06)

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 car’s 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. ….(designed by David A. Johnson)

RFID Tag & COB Development Guide with Microchip's RFID Devices - Microchip Application Note Published 21-Nov-02 (app note added 2/06)

RFID-Zapper - Afraid the government is trying to track you? Want to disable your old credit cards wireless signal? Need to get that new backpack out of Macy’s without getting caught? You need to disable those RFID tags….(project added 6/07)

Transponder coils in an RFID system - Coilcraft Power Magnetics Application Note (app note added 6/06)

Wideband RF ICs for Power Detection & Control - DN335 Design Notes (Linear Technology) (app note added 1/06)

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 car’s 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. ….(designed by David A. Johnson)

RFID Circuits: #'s - N M - Z