This is a simple LED Vu meter circuit based on the LM3914 IC.
You can use either the LM3914 or the LM3915.The difference between the two is that the LM3914 is analog while the LM3915 is logarithmic.
The input comes for your audio amlifier the speaker out (+ and -).
Feed this circuit with 9 to 12 volts.
Here is the schematic.
And here is an easier way to read the schematic.
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You can use either the LM3914 or the LM3915.The difference between the two is that the LM3914 is analog while the LM3915 is logarithmic.
The input comes for your audio amlifier the speaker out (+ and -).
Feed this circuit with 9 to 12 volts.
Here is the schematic.
And here is an easier way to read the schematic.
You do not need the 1k resistor, becausa the output of LM3914 has an current source.
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