The transmitter and receiver circuits of the infrared alarm system shown here have been designed for a range ... including the ones suggested in the diagram do not respond very well to continuous ...

Dog repellent The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter ... The circuit can be modified for various applications including AC operated alarm systems.

have developed methods and apparatus for generating a data structure indicative of an alarm system circuit. According to the U.S. Patent & Trademark Office: "A user of a computer aided design ...

is a free of charge program that allows fire alarm system designers the ability to easily optimize circuits using an interactive graphic interface rather than paper and pencil. The HPP-CALC can ...