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- CMOS
INVERTER 125KHz LC OSCILLATOR
This circuit uses a single CMOS inverter to form a series resonant LD oscillator.
The values shown set the oscillation at about 125KHz but other frequencies are
possible by changing the main LC values
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- 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.
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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.
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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.
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