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Decibel Meters
Last Updated on: Thursday, April 07, 2016 01:03 PM

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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Audio VU Meter -  LM324, This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. . .  [by Matthew Hewson]

LED Decibel Meter -  The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as. . .  [by Bill Bowden]

LEDs Indicate Sound Level -  08/25/11  EDN Design Idea   Build a battery-operated portable meter to measure sound-pressure levels. This Design Idea describes a battery-operated, portable soundlevel meter (Figure 1). Its portability makes it useful for detecting the source of noise in automotive engines and power trains, factory machinery, and residential HVAC (heating/ventilation/air-conditioning) systems. . .  [by Stephen Kamichik, Ile Bizard, PQ, Canada]
Precision Audio MilliVoltmeter -  Measures10mV to50Volt RMS in eight ranges Simply connect to your Avo-meter setAT 50µA range. . .  [Flavio Dellepiane's web site]

Room Noise Detector -  One LED monitors three levels: 50, 70 & 85 dB; Useful to detect too noisy environments. . .  [Flavio Dellepiane's web site]

Sound Level Meter -  One chip replacement for the standard analog meters, based on LM3915 audio level IC. . . .  [Design by Aaron Cake]

Sound Level Meter Circuit -  This sound level meter circuit can be used to control the intensity of a sound recording or in a disco. It has 5 measurement domains between 70 and 120 dB; reading accuracy is 0. 5 dB. Microphone M1 is used to receive the acoustic signal and is coupled to C1, C2, R1 and R2. This components, together with the microphone’s. . .  [Circuit posted by Popescu Marian]

Sound Pressure Level Meter -  The Schematic and PCB have now been Completed, It All works well. . . .  [G.L. Chemelec]


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Decibel Circuits


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