This kit builds on a famous LM3916 VU bargraph driver chip from TI/National semiconductor. The chip is essentially a constant current 10 segment driver fed by an array of comparators. It also provides internal reference voltage to set the rail of the precision resistor network feeding the comparator reference inputs. A signal coming in then determines how many signals are lit. Depending on the mode selected, either bargraph or a single dot is displayed. This particular kit is using LM3916, optimized for audio meter applications but could also be used with LM3914 and LM3915 parts to get linear and log response respectively (mainly set by the individual resistance values of internal divider networks).
LM3916 LED bargraph/ VU meter - [Link]
O’K, after having some fun with stereo version of the VU meter I described in my previous blog-post, now it’s time to do a serious stuff. Studio grade VU meter !!! 24 steps, equally spaced every 3 dB, covering Extra wide Dynamic Range from -63 up to +6 dB. Single (mono) channel this time, no messing around, absolute precision at the stake. Plus, it keeps absolutely Top-Flat linear frequency response from 40 Hz up to 20 kHz(*).
Audio VU meter with extra wide Dynamic Range 69 dB - [Link]
This project is a little VU meter and spectrum analyzer using an op-amp, an Arduino and a 16×2 char lcd.
AVR VU meter and spectrum analyser – [Link]
This project is a VU meter using 14 IN-13 bar-graph Nixie tubes. The producing effect is really nice. Each of the tube is connected on driving circuitry that include bandpass filters of 60, 150, 400, 1000, 2500, 6000 and 15000kHz pass. Then each filter output is converted to DC and converted from logarithmic to linear scale suitable for Nixie tubes.
Nixie VU meter - [Link]
Simon Inns @ Waiting of Friday builds a cool VU meter using RGB leds. RGB leds are controlled by 3 TLC5940 LED driver chips and PIC18F2550 microcontroller. Source code and schematic is available on the link below. [via]
This project creates a RGB LED VU Meter which is controlled via USB by a Windows 7 or Vista host machine. The demonstration board consists of a 5V regulator (switching), a PIC18F2550 with the required USB components, 3xTLC5940 16 channel serial LED drivers with PWM and 16 high intensity RGB LEDs.
RGB LED VU Meter using TLC5940 LED Driver Chips – [Link]
VU (Voltage Unit) meters are often included in analog audio equipments to display a signal level in Visual Units. We are building a mono input VU meter in this project. You can build one more to use them in stereo mode. Input sensitivity is about 1 Volt rms, up to +6dB. You can adjust the amplitude of the input by using the multiturn 50k linear potentiometer (POT1).
10 LED VU Meter Project by LM3915 and LM324 – [Link]
This instructable describes how to mount a VU meter into a case of an old cd-rom drive and then put it into your pc.
On eBay I bought a bunch of VU meters based on VFD displays build in Russia. The displays where rather cheap and looked nice. I thought I’d give it a try.
When the vu meters arrived I realized that on all devices there was one transistor missing. To make them work again you need to “repair” the vu meter … don’t panic you can easily solder a substitute transistor onto the pcb.
Building a VU meter for you multimedia PC - [Link]
Does your amplifier have a level indicator? I always envied the fancy amps with LED level bar graph that you find on most stereo systems or amplifiers. This is your chance to build your own LED VU meter that you can link to your amp and watch it in action. The application is based on LM3915 chip. This is a monolithic Dot/Bar Display Driver IC made by National Semiconductor. It takes an analog voltage input on pin 5 then drives 10 LED’s providing a logarithmic 3dB/step analog display.
LED VU meter – [Link]