If you want a simple audio alarm , this circuit will be useful . almost any transistor will work , R1 and C1 will vary the tone .A 0.5 Watts / 8 Ohms speaker is offer .
Resistor
5K
01
Capacitor
0.02uF
Transistor
2N2222
2N3638
Reference : " Zeus Electronics "
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Last Updated : February 15, 2002
Last Updated : February 15, 2002 
