Comments: Dot/Bar Display Driver Hookup Guide


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  • Member #546452 / about 10 years ago / 2

    Hi. Please can you post the schematic of the 4 (or more) daisy chained LM3914? Thanks...

  • Member #203678 / about 3 years ago * / 1

    I'm having problems with this equation and these numbers from the tutorial.

    "VREF = 1.25V(1+R2/R1)+R2x80uA In the circuit above, where R1 is 2.2kΩ and R2 is 3.3kΩ, VREF will be about 3.4V (safely 1.5V under the supply voltage)."

    3.4 != 1.25x(1+3.3/2.2)+3.3x0.8 Where am I making a mistake?

  • Member #1523539 / about 5 years ago / 1

    Hi, thank you for the great post, it helped me a lot to incorporate a battery indicator into an expositing project. Could you maybe please just help me with the resistor values when using a 4.2V lipo battery instead?

  • Member #549251 / about 9 years ago / 1

    I am struggling with the function R(adj). Why is it sometimes tied to ground and other it has a voltage divider? Also in the cascading example it seems that the R(hi) is tied to ground on the bottom chip, and it sends its R(Lo) to the other chip.

  • Parizival / about 10 years ago / 1

    How were you able to connect the bar graphs to the power rail and keep them next to each other? When I try it there is a gap between them.

    • jimblom / about 10 years ago / 1

      Heh, yeah...darn that gap. I ended up bending the legs that hit the gap 90° over, and wrapping them around the next leg over (for a temporary solution, soldering for more permanent).

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