Lm3915 Calculator Updated

The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, providing a logarithmic 3 dB/step analog display. It is widely used in audio equipment, signal level meters, and VU meters.

The current driving each individual LED is directly proportional to the current drawn out of Pin 7. The LM3915 regulates the LED brightness to approximately 10 times the current passing through R1cap R sub 1 lm3915 calculator updated

ILED≈12.5R1cap I sub LED end-sub is approximately equal to the fraction with numerator 12.5 and denominator cap R sub 1 end-fraction ILEDcap I sub LED end-sub The LM3915 is a monolithic integrated circuit that

R2=R1×(VREF1.25−1)cap R sub 2 equals cap R sub 1 cross open paren the fraction with numerator cap V sub cap R cap E cap F end-sub and denominator 1.25 end-fraction minus 1 close paren Substitute our known values ( The LM3915 regulates the LED brightness to approximately