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June 01, 2013



In 1992 there were a number of cases where the Dutch police just 'happened to have the luck' that the phone was off-hook enabling them to listen in on the room in several cases. Some serious research by BillSF found the method with these high frequency signals down the line. And the simple solution with a small capacitor across the line.
Technical article (in Dutch) about how to build your own circuitry for this: http://www.hacktic.nl/magazine/1824.htm

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