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Supervisory IC makes simple line monitor

http://www.edn.com/archives/1996/030196/05di4.htm

 



You can use the MC34161P universal voltage monitor to build a simple ac power-line monitor (a voltage-sensing relay). In this application (Figure 1), the mode select pin (pin 7) connects to the internal 2.55V reference (pin 1), and the IC functions as a positive-voltage window detector. visit page.