Sound Level Meter -  One chip replacement for the standard analog meters, based on LM3915 audio level IC. . . .  [Circuit designed by Aaron Cake]

Sound Level Meter Circuit -  This sound level meter circuit can be used to control the intensity of a sound recording or in a disco. It has 5 measurement domains between 70 and 120 dB; reading accuracy is 0. 5 dB. Microphone M1 is used to receive the acoustic signal and is coupled to C1, C2, R1 and R2. This components, together with the microphone’s. . .  [Circuit posted by Popescu Marian]

Stereo VU Meter Circuit -  This is it. It's a STEREO LED LEVEL METER. It's the cheapest and best bar graph display available and best of all, it uses readily available components. You only need a handful of LEDs, 22 transistors, some resistors, diodes and a set of. . .  [email Colin Mitchell: talking AT tpg.com.au]

Volume Control -  based on DS1669 Digital Pot IC. . .  [Circuit designed by Aaron Cake]

Volume Control has Log Taper -  11-Apr-02 EDN Design Idea   Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flawa nonlogarithmic step increment. To avoid this problem, a user must. . .  [by Doug Farrar, Los Altos, CA]

VU & PPM Audio Metering -  circuits using analog needle meters. . . 

VU Meter (spelektoniikka) -  5 led VU meter, in PDF format, includes circuit board, text in Finnish. . . 

VU Meter 3 -  A very simple circuit of indication of level, with 10 Led. Is used the circuit of half-wave rectification of precision round the IC2, with gain one. With switch S1, we can select the indication of Led. The level of entry is 60 mV-1. 25 V. . . 

VU Stereo Meter -  This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the speaker. . .  [Randy Linscott]