circuit diagram of room noise detector pdf download

[bishin ali]

Parts:

R1__10K 1/4W Resistor
R2,R3__22K 1/4W Resistors
R4__100K 1/4W Resistor
R5,R9,R10__56K 1/4W Resistors
R6__5K6 1/4W Resistor
R7__560R 1/4W Resistor
R8__2K2 1/4W Resistor
R11__1K 1/4W Resistor
R12__33K 1/4W Resistor
R13__330R 1/4W Resistor

C1__100nF 63V Polyester Capacitor
C2__10 F 25V Electrolytic Capacitor
C3__470 F 25V Electrolytic Capacitor
C4__47 F 25V Electrolytic Capacitor

D1__5mm. Red LED

IC1__LM358 Low Power Dual Op-amp

Q1__BC327 45V 800mA PNP Transistor

MIC1__Miniature electret microphone

SW1__2 poles 4 ways rotary switch

B1__9V PP3 Battery

Clip for PP3 Battery

[kingofring_131@]

This circuit is intended to signal through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret microphone to drive a LED. With SW1 in the first position the circuit is off. Second, third and fourth positions power the circuit and set the input sensitivity threshold to 85, 70 & 50 dB respectively.

[akancha]

hi i am a student working on noise detection i found out i can get a circuit diagram sample from here please kindly share.
thank you in advance