In this tutorial, you will learn how to simulate voltage level indicator using the LM3914 Dot/Bar graph Driver. The LM3914 is a monolithic analog controlled LED driver IC as well as its counterpart the LM3916, the difference between the both is that the LM3916 gives a logarithmic output scale, while the LM3914 gives a linear output scale, this makes the LM3916 suitable for volume unit (VU) meter. The IC can drive 10+ LEDs. One interesting thing about the IC is that it can be configured into either a dot output mode or a bar graph output mode.
To carry out the simulation Proteus, you must have installed Proteus in your computer and then pick the following components to make the connection:
- 12 volts battery (active)
- 3 LED-RED (active)
- 3 LED-BLUE (active)
- 3 LED-YELLOW (active)
- 1 LED-GREEN (active)
- 10K Potentiometer (active)
- 2.2K Resistor
- 18K Resistor
- DC Voltmeter
- SPST Switch (active)
Note that the active components must be selected to give real-time simulation. See full video of the simulation below
In the subsequent tutorial, I will design the real circuit and make a video tutorial as well.
Before then, check out this other circuit simulation tutorials.