900Mhz/1800Mhz Cellphone detector

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Actually we just need to pass a working project in order for our school to release our trancripts!!! That's our problem actually, we're very familiar with the theory but we can't apply it. I know what you're trying to point out. But this conversation is already pointless since we know it's our FAULT! you can preach all you want but sh*t happens. you just can't do anything about it and that only leaves you to turn to people like you who could help. i hope you understand me.
 
i'm having a problem right now. since the ckt below could only detect one frequency band, what should i do for both 900Mhz and 1800Mhz? should i just add a coil parallel to it?

**broken link removed**
 
Despite your grasp on theory which you "can't apply", a coil in parallel will not do the job. A second coil and a DPDT switch might do the the job.
 
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I think that these cell phone detector projects are very old. Maybe the circuits were designed long before cell phones were invented. No wonder they do not work.

They might detect a cell phone when they are touching, then the RF will overload the input of the opamp.
 
Just imagine the embarasment of "detecting" a cellphone only to find that the alleged perpetrator doesn't even own one. That's a surefire cure for sticking your nose where it doesn't belong.
 
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Haven't you seen Instructables projects?
They are designed by little kids who know nothing about electronics.
 
i am in final year of be electronics. i want project ideas.
it may be based on controller or on power electonics.
if u have any ckts or know about any sites plz send me the links.
 
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