Keeping control of your telephone bills or just reserving sufficient time for your calls when there are teenagers in your house, this circuit will give the phone-hog a 2 second warning tone which if ignored will cut the line in 20 seconds. Access to the line is locked out for another 10 seconds.
Power Supply: Powered from the telephone line
Time Range:from 1 to 20 minutes
PCB Dimensions 53.8 mm X 91.2 mm X 15 mm (2.12 X 3.59 X 0.6 in.)