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Hi im trying to find a ready made under voltage monitor for a regular 9 volt battery similar to whats used in a smoke alarm in that when the voltage drops to a point it flashes a LED and produces an audible chirp. Lookig for a plug and play ready made PCB to incorpate in a project im tryinng to get going
Thanks
http://www.engineersgarage.com/electronic-circuits/battery-level-indicator
you can refer this link for you design i could'nt help you in getting ready made pcb board.