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: 1881
Print version: 
Other electronic circuits and schematics from Audio
-
Stereo Tone Control
-
Surround Sound Decoder
-
200W audio amplifier
-
Amplifier of acoustic frequencies with preamplifier
-
Digital Volume Control
-
50 Watt Amplifier
-
Band 2 Preamplifier
-
Amplified Ear
-
1W Bass Power Amplifier
-
Amplifier 2x30W with STK465