This circuit use 2 beep danger sound origins. By use the integrated circuit LM3900 just one. Which compose OP-Amp 4 group stay within the integrated circuit and have , Mosfet , give -ing the sound with 8-80 ohm small-sized loudspeakers s by use , power supply 9V sizes will arrive at 12V may are battery 12 Voltage all right. For other detail have a few the equipment a little also, request friends have fun this circuit.
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This entry was posted on Friday, December 12th, 2008 at 9:06 am and is filed under alarm systems, Audio - Alarm.
