The is a specialized integrated circuit (IC) widely used by hobbyists and engineers to create logarithmic visual displays, most notably for audio VU meters and signal strength indicators . Unlike the linear LM3914, the LM3915 features a 3 dB per step logarithmic response, which matches how human hearing perceives sound intensity.
below . If your supply is higher (e.g., 12V), use a dropping resistor in series with the LEDs to prevent the IC from overheating, especially in Bar Mode. Mode Selection (Pin 9) : Bar Mode : Connect Pin 9 directly to Pin 3 ( Dot Mode : Leave Pin 9 floating (open circuit). Input Protection : While the IC can withstand ±35Vplus or minus 35 cap V , adding a lm3915 calculator updated
The reference voltage determines the "full scale" point—the voltage level required to light up the 10th LED. The is a specialized integrated circuit (IC) widely
VREF=1.25V×(1+R2R1)cap V sub cap R cap E cap F end-sub equals 1.25 cap V cross open paren 1 plus the fraction with numerator cap R 2 and denominator cap R 1 end-fraction close paren : Connected between Pin 7 (REF OUT) and Pin 8 (REF ADJ). : Connected between Pin 8 (REF ADJ) and Ground. Step 2: Calculate LED Current ( ILEDcap I sub cap L cap E cap D end-sub The current flowing out of Pin 7 ( IREFcap I sub cap R cap E cap F end-sub If your supply is higher (e
7 February 2024
The is a specialized integrated circuit (IC) widely used by hobbyists and engineers to create logarithmic visual displays, most notably for audio VU meters and signal strength indicators . Unlike the linear LM3914, the LM3915 features a 3 dB per step logarithmic response, which matches how human hearing perceives sound intensity.
below . If your supply is higher (e.g., 12V), use a dropping resistor in series with the LEDs to prevent the IC from overheating, especially in Bar Mode. Mode Selection (Pin 9) : Bar Mode : Connect Pin 9 directly to Pin 3 ( Dot Mode : Leave Pin 9 floating (open circuit). Input Protection : While the IC can withstand ±35Vplus or minus 35 cap V , adding a
The reference voltage determines the "full scale" point—the voltage level required to light up the 10th LED.
VREF=1.25V×(1+R2R1)cap V sub cap R cap E cap F end-sub equals 1.25 cap V cross open paren 1 plus the fraction with numerator cap R 2 and denominator cap R 1 end-fraction close paren : Connected between Pin 7 (REF OUT) and Pin 8 (REF ADJ). : Connected between Pin 8 (REF ADJ) and Ground. Step 2: Calculate LED Current ( ILEDcap I sub cap L cap E cap D end-sub The current flowing out of Pin 7 ( IREFcap I sub cap R cap E cap F end-sub
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