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Thank you Edd you seem to be the only one that really understood what i ment and how the device detected it. I was getting a little frustrated but i figured someone would know. This is exactly the curcuit i needed. Also do you know if it runs off of 12 volts and if it doesnt where i could get the di...

I forgot that it also needs to run off of 12VDC for a car

No problem woody glad to help, your just lucky i stumbled across it.<p>-Mike

well im not sure you guys are understanding me, below is a link to a product that detects cellphone signal and makes lights go off. http://www.cellphoneshop.net/fluncephhoad.html i need a circuit like that that will detect it but instead of lighting up LEDs ground a wire (or ground it with a resisto...

I know there has to be a way because there are cell phone holders that flash when you get a call, because it picks up a certain cell phone signal. What I need is a way to have a device that will detect the signal much like the cell phone holders and ground the wire with or without that resistor.<p>-...

Well I think I found a resource that will help you. this is a circuit and it even has C code for displaying what you need. I hope this helps.<p>http://www.electronicsforu.com/efylinux ... oscope.pdf<p>-Mike

Ive done some research and ive found out that I can use the cellphone mute function of my aftermarket stereo, all i need to find out is how to set it up in a way that a circit can detect the cellphone signal, and mute the radio. Now i know that to make it mute it needs to be grounded, but i saw some...