Circuit Design for Noise Meter

In this tutorial, we are going to learn about circuit design for noise meter.

Below is the use of noise meter.

As per circuit of noise meter, the noise pollution is watches out for some non-communicable diseases and. Safe level of noise is considered up to 30 DBs. This is an intriguing circuit by dream lover technology, “Noise Meter” used to quantify the level of noise arraigning by LED and likewise it gives cautioning when noise crosses the protected level of 30 DB by beeping sound.

Working of noise meter:-

The whole circuit of noise meter has been outlined and manufactured utilizing sound intensity sensor and display unit. This condenser microphone is utilized as sensor of noise meter with operational amplifier (IC2) and relating passive components. The inverting and non-inverting input is given to operational amplifier IC (IC2) from pin 2 and pin 3 separately. Where yield from pin 6 of IC2 is associated with the inverting input for negative feedback through resistor R5. The controlling sound air conditioning signal from potentiometer VR1 is first rectified by diode (D1 and D2) and keeps up it at the yield level of IC2. The display unit is composed around solid IC LM3914 (IC3). It drives ten LEDs by detecting simple voltage. Each LED is associated with yield of IC3 speaks to the sound level of 3 DB in plunging request from 18 to 10. The gleaming each of the ten LEDs show sound intensity is 30DB.

 The PNP transistor get base bias when yield at pin 10 of IC3 goes low to drive the PIEZO BUZZER keeping in mind the end goal to give sound. Typically, sound intensity up to 30 DB is charming. Over 80 DB, it winds up irritating. What’s more, on the off chance that it goes past 100DB, it might influence your psychomotor execution, degrading your consideration and causing pressure. Noise pollution may likewise influence your listening ability capacity.

Below is the list of BOM-

Sr No.QtyLocationValue
11BZ1MIC
21BZ1BUZ1
31C11000U/25V
42C3,C2100NF
51C4220NF
61C547U/25V
71C61U/16V
81C72.2U/10V
92D2,D1IN4148
101D3IN4007
111IC2CA3031
1210LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED8,LED9,LED10LED
132R1,LED1110K
141Q1BC558
151R212K
161R510M
171R62.2K
181R84.7K
192R9,VR1K
201R105K
211U178L05
221U3LM1202

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