Lm3915 Calculator 🆓

( R_\textset = 12.5 / 0.015 = 833.3 \ \Omega ) → use 820 Ω.

RLO = 0 V (ground). RHI = 5.0 V (to reference). But now the highest LED triggers at ( V_\textin \approx 5.0 ) V peak? That’s far above 1.414 V. So we must attenuate input. LM3915 Calculator

A dedicated calculator solves these with direct equations. 4.1 Reference Voltage Divider (R1, R2) Given desired ( V_\textref ): ( R_\textset = 12

0 dBV = 1 Vrms → peak = 1.414 V. -30 dBV = 0.0316 Vrms → peak = 0.0447 V. LM3915 Calculator