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Audio level meter (vumeter) Click here for the circuit diagram
This circuit uses just one IC and
a very few number of external components. It displays
the audio level in terms of 10 LEDs. The input voltage
can vary from 12V to 20V, but suggested voltage
The LM3915 is a monolithic integrated circuit
that senses analog voltage levels and drives ten
LEDs providing a logarithmic 3 dB/step analog
display. LED current drive is regulated and programmable,
eliminating the need for current limiting resistors.
The IC contains an adjustable voltage reference
and an accurate ten-step voltage divider. The high-impedance
input buffer accepts signals down to ground and
up to within 1.5V of the positive supply. Further,
it needs no protection against inputs of ±35V. The
input buffer drives 10 individual comparators referenced
to the precision divider. Accuracy is typically
better than 1 dB.
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