Lm3914 Vu Meter Circuit Diagram. Each comparator is an op amp with gaining reference voltage at its negative terminal. The circuit will display signal level of any audio equipment.
By using this circuit the level of the signal in the audio device can be displayed like a stereo system the audio level of cd etc. The lm3914 works well with led bar graphs because it allows us to adjust the voltage and current going to each led output by simply. Firstly the analog input is coming from p1 audio input mic smartphone.
It is an example of a dot display.
Each comparator is an op amp with gaining reference voltage at its negative terminal. The internal circuit of lm3914 is shown below. The lm3914 works well with led bar graphs because it allows us to adjust the voltage and current going to each led output by simply. Led bar graphs are used often in vu meter circuits in which the led bar graph can be lit up in proportion to the amount of voltage a device is outputting.
