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This is a sound level meter circuit based on AN6877 and AN6878 series. you can use this for any audio system such as Amplifier, Radio, or TV.
The AN6877 and AN6878 are monolithic integrated circuit driving 7 LED s. The AN6877 respond linearly and the AN6878 does logarithmically for input signal. As output current adjusting pin is set, it can control LED brightness. (by changing value of Rc)
Features
- 7 LED bar graph display drive
- Linear (AN6877) and Logarithm (AN6878) response
- Adjustable Brightness
- High output current (25mA)
For stereo system you need two of this circuit and you can adjust sound sensitivity by challenging the value of RV1.
Supply voltage for this circuit is 6-12v.
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