hey i need 3 different possible circuits for a small device i am making. I am making a circuit where an PIR sensor detects movement and when someone is detected a pre-recorded message is played. This message is recorded beforehand. A silent mode is also added to add a answering machine style function. I need 3 differnet possible circuits. Not too complicated...for example...Nand gate with voice record chip (i dont know... 
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please help
will
)please help
will
