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This is a another sound level meter circuit using LB1403N. You can use this for any audio system such as Amplifier, Radio, or TV. As well as you can use this either ac level meters such as vu meters or dc level meters such as signal meters.
Features of LB1403N
- Capable of generating a bar-display for input voltage with 5 LEDs.
- Operates from either AC or DC input voltage because of on-chip rectifier amplifier.
- Lighting levels remain stable to line regulation because of on-chip voltage reference.
- LEDs are driven by a constant current; stable to line regulation.
- Power supply voltage range is wide (3.5 to 16V), for wide range of applications.
- SIP-9 pin package and fewer externally connected component result in smaller space requirements on the circuit board.
- Low noise at LED lighted mode.
For stereo audio systems you need two of this circuit and you can adjust the sound sensitivity by challenging value of RV1.You can directly connect this circuit with output of your amplifier or any other audio system.
Supply voltage for this circuit is 6-12v.
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