Lm3915 Calculator Apr 2026

Choose R1 = 1.2 kΩ. ( R2 = 1200 \times (5.0 / 1.25 - 1) = 1200 \times (4 - 1) = 3600 \ \Omega ) (3.6 kΩ).

[ V_\textRLO = V_\textLO - \text(offset) \quad \textand \quad V_\textRHI = V_\textRLO + \fracV_\textHI - V_\textLO10^(9/10) ] LM3915 Calculator

[ V_\textin,peak = \sqrt2 \times V_\textrms ] Choose R1 = 1

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

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