This electronic vu meter set is a circuit that high performance and widely popular than 40 years i made a lot of amplifiers. Lm3914 dotbar display driver, national semiconductor. After lots of test on the circuit which is provided in the datasheet i have recreated the circuit which is present above. Output current programmable from 2 ma to 30 meter circuit. Here is highperformance lm3914 lm3915 vu meter circuit projects that can display with 20 leds on stereo or mono with 10 leds for all audio system. Reference voltage pin 6 is low, and the reference voltage divided up. Its easy to make vu meter or 10 dotbar dc level meter with lm3914. Led vu meter circuit diagram using lm3914 and lm358. How to make audio level, vu meter using lm3914 ic youtube. The lm3914 can also act as a changes the display from a moving dot to a bar programmer, or sequencer. Lm3914 datasheet, lm3914 pdf, lm3914 data sheet, lm3914 manual, lm3914 pdf, lm3914, datenblatt, electronics lm3914, alldatasheet, free, datasheet, datasheets, data. How to build an lm3914 dotbar display driver circuit. Connect 10 pieces leds cathode pin to ic,s 1,18,17,16,15,14,12,11,10 no pin.
Within the integrated circuit lm3914 is a voltage range advantage. When raising the power supply circuit and the signal came, the sound signal to be via d1 optical direct fire only split the signal to. The circuit uses minimal component to make the job done. 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.
The lm3914 is a monolithic integrated circuit that as well as a led at the same time, so controller senses analog voltage levels and drives 10 leds, functions including staging control can be providing a linear analog display. Dual led flasher using relay flip flop led circuit. We have built a volume meter or led vu meter circuit, with the help of mic, op amp and lm3914, which glows the leds as per strength of the. We have built a volume meter or led vu meter circuit, with the help of mic, opamp and lm3914, which glows the leds as per strength of the sound, if sound is low, lesser leds will glow, and if sound is high more leds will glow. In this project, we are going to show how to connect a lm3914 dotbar display driver so that it can control 10 led outputs. How to make audio level indicator vu meter using lm3914 ic. Inputs operate down to ground the lm3914 is very easy to apply as an analog output current programmable from 2 ma to 30 meter circuit.
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