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A simple audio power meter circuit using LM3915

2014-11-28 03:17  
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A simple audio power meter circuit using LM3915
Note: If the speaker internal resistance is 4Ω, Rx takes 10kΩ If the speaker internal resistance is 8Ω, Rx takes 18kΩ If the speaker internal resistance is 16Ω, Rx takes 30kΩIt uses IC to display AC input signal amplitude, and the more perfect method is to use a half - wave converter to change AC signal into DC signal, the DC signal is sent to the input terminal of IC.