Sound Level Meter
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components.
Schematic
Parts
| Part | Total Qty. | Description |
| C1 | 1 | 2.2uF 25V Electrolytic Capacitor |
| R1 | 1 | 1K 1/4W Resistor |
| D1 | 1 | 1N4002 Silicon Diode |
| LED1-LED10 | 10 | Standard LED or LED Array |
| U1 | 1 | LM3915 Audio Level IC |
| MISC | 1 | Board, Wire, Socket For U1 |
Notes
1. V+ can be anywhere from 3V to 20V.
2. The input is designed for standard audio line voltage (1V P-P) and has a maximum input voltage of 1.3V.
3. Pin 9 can be disconnected from ground to make the circuit use a moving dot display instead of a bar graph display.
Title: Sound Level Meter
electronic circuit
Source: www.aaroncake.net
Published on: 2005-02-01
Reads: 1864
Print version: 
Other electronic circuits and schematics from Audio
-
Stereo Tone Control
-
Electret Microphone Pre-Amplifier
-
Infrared Head Phones
-
Stereo Channel Selector
-
Ultrasonic Switch
-
Digital Volume Control
-
FET Audio Mixer
-
Portable Microphone Preamplifier
-
Balanced Low Noise Microphone Preamp
-
Musical Instrument (Expandable) Graphic Equaliser