Here is the tone generator circuit,it is small size.
I use IC digital Cmos 4011 quad NAND gate.
This will cause another NAND gate to pulse oscillater which will drive another gate to output a 1.3KHz tone.
The transistor provides drive for the 8 ohm speaker.
The IC 4011 ‘s Input pin 1 for Control output tone generator, so logic “Low” don’t have tone but logic “HI” it have tone sound at speaker.
The capacitors C1 and C2 are determine tone frequency rate.
And the resistors R3 is control sound volume,so it must have less than 180 ohm at 9 volt supply.
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This entry was posted on Tuesday, May 6th, 2008 at 11:56 am and is filed under Audio - Alarm, Digital.
