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Sicode
Apprentice

67 Posts
Posted - May 25 2011 :  6:03:45 PM  Show Profile  Reply with Quote
Pebe, this is similar to what i was searching for.I will try and verify how it goes. any possibility? from here:

http://1.bp.blogspot.com/_RpOfkmvmOVM/TNV5cgurXEI/AAAAAAAAApU/0T64QuTaV-c/s1600/cellphone+call+detector+sch.png

Download Attachment: cellphone_call_detector_sch.jpg
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - May 25 2011 :  9:06:59 PM  Show Profile  Reply with Quote
The transistor is a widebnand amplifier so it will pickup mains hum, AM radio stations, FM radio stations, TV stations, taxi cab transmitters, police transmitters and hundreds of other transmitters including nearby cell phones that are ringing.
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Sicode
Apprentice

67 Posts
Posted - May 26 2011 :  01:05:17 AM  Show Profile  Reply with Quote
Audioguru, guru indeed. Tried the circuit overnight. Senses everything in the damned air, and nearly picks my voice. loooooool
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