Instead of just giving ( R_1 ) and ( R_2 ), the new calculators provide E12/E24 series standard values (e.g., "Use 1.2kΩ and 820Ω") and show the resulting error percentage.
R1=12.50.01=1250 Ωcap R sub 1 equals 12.5 over 0.01 end-fraction equals 1250 space cap omega
Bookmark the official LM3915 Calculator Updated tool. Check the comments section for the latest 2025 resistor standard values and community-built circuit boards. lm3915 calculator updated
) switches the IC to (all LEDs up to the current signal level light up simultaneously). Pin 4 (Low Reference, RLOcap R sub cap L cap O end-sub
For decades, the LM3915 has been the undisputed champion of analog bar graph display drivers. Whether you are building a vintage VU meter for a hi-fi amplifier, a DIY audio spectrum analyzer, or a simple battery level indicator, this IC from Texas Instruments (originally National Semiconductor) has been a go-to component. However, one significant hurdle has always plagued engineers and hobbyists: Instead of just giving ( R_1 ) and
The fixes all of this.
R1=12.5ILEDcap R sub 1 equals the fraction with numerator 12.5 and denominator cap I sub cap L cap E cap D end-sub end-fraction ) switches the IC to (all LEDs up
However, there has always been one problem:
Each step represents a 3 dB change in power level, making it ideal for audio applications.