Radio-triggered voltage multiplying circuit

[Pro Disma]

voltage multiplying

Hi all!

I need a circuit for a wireless receiver (@433MHz) front end that will use the (very low) RF power from the transmitter to produce (at its O/P) a voltage high enough to raise an µP interrupt. The circuit should ideally draw no power, i.e. no use of amplifiers etc.


Thanks

 

[biff44]

You could do a loop antenna, a passive bandpass filter, and a voltage doubling pair of schotky diodes with an R-C lowpass filter. If you are close, you might generate 20 mV, and if you are very close maybe 100 mV. Pick a micro with an analog comparator in it, like one of the Microchip ones, and you are all set.

Of course, any signal strong enough at 433 MHz will get picked up also. You might do some sort of unique AM pulsing code on the transmitter (on-off...) that the microcontroller can recognize.

 

[sal83]

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