How ever nowadays trend is using digital audio equilisers, here is an audio level meter circuit using LM3915 sound level IC. This IC works great on even low voltages up to 3V to as high as 20 volts. This Audio indicator circuit is designed to give an input of 1v (p-p) and a maximum input voltage of 1.4 V.
Circuit Diagram of Sound Level Meter Using LM3915 : Click to enlarge
The circuit shown in figure uses 10 standard LEDs to display a mono channel sound level. If you need to display two channels, you need two identical circuits. Unlike other circuits, this circuit can be configure to show moving bar or dot display by connecting or disconnecting the pin no.9 from +V
Parts Description
- U1 LM3915 Audio Level IC
- LED1-10 Standard LED
- R1, R3 1K 1/4W Resistor
- R2 10K 1/4W Resistor
- R4 100K 1/4W Resistor
- R5 1M 1/4W Resistor
- C1 2.2uF 25V Electrolytic Capacitor
- C2, C3 0.1uF Ceramic Capacitor
- D1 1N914 Diode
- Q1 2N3906 PNP Transistor
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1 comments:
VIBRATION AND SOUND ARE TWO MOST IMPORTANT PARAMETERS FOR MONITORING THE MACHINE HEALTH. REGULAR LOGGING OF THESE TWO PARAMETERS PROVIDES EARLY WARNING OF BREAKDOWN
Sound Level Meter
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