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Gadget Freak Case #115: Remote Telephone Indicator Lights up Ringing Cubicle

By Design News Staff -- Design News, February 3, 2008

You leave your cubicle to get a cup of coffee. You get a few feet and hear a phone ring. Is it yours? You dash back and nope, not yours. You head back for the coffee and hear a phone ring again...

Alan Vogel has a gadget that solves that aggravating problem. His Remote Telephone Indicator turns on a light above the cubicle when your phone is the one ringing. The gadget is relatively simple. You don't have to open the phone and add wires. It senses when your phone is ringing and sends a signal to the light posted high above your cubicle. Even from a distance, you can see that your cubicle’s phone is the one that’s ringing.

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Amt Part Description
1 Wall XFMR 9V dc, 200 mA 928-9892
1 J1 2.1 mm Power Jack 932-9425
1 CDS1 Photocell 699-6051
1 R1 750 Ω, 1/4W Resistor 832-0869
1 R2 330 Ω, 1/4W Resistor 832-0018
1 R3 10K Ω, 12-Turn Pot 754-2232
1 Q1 VN2222L N-FET Transistor 568-0414
1 D1 1206 SMT Red LED 679-0260
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