DIY...Electronic...Repair...Amplifier.

DIY...Electronic...Repair...Amplifier.

lm3914 schematic diagram and test

If you want to make a simple VU meter. LM3914 is the best choice for you. It's easy to make VU meter or 10 dot/bar DC level meter with lm3914. 

lm 3914 can withstand +-35 volts input without any damage so you can make VU meter even you are new in electronic DIY.

The circuit uses minimal component to make the job done.
List of component:
R1 = 1 kilo-ohms
R2,R3 = 4.7 kilo-ohms
R4 = 10 kilo-ohms
ic = lm 3914n-1 (lm3914)
C1 = 4.7 uf at least to 47 uf (better bass respond)
10 LEDs red,green,yellow,orange or whatever you want
9 - 12 volts DC power supply

LM3914 schematic diagram


   Lm3914 VU meter video, the video show step by step guide and circuit explanation.

Now, I add a sine wave rectifier circuit to lm3914, it makes the dot mode more accuracy.

Real dot mode VU meter schematic diagram

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