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Audio bar graph. Small! - Page 1 - EEVblog
https://www.eevblog.com/forum/beginners/audio-bar-graph-small!/
The Small signal audio design book uses resistor divider ladders, LEDs and BJTs. For 5 meters this will result in a board about 4" square. Much like a meter panel on a large desk. I want it in 2" square or so. Using "one" and PFL or "meter select" switches is an option, but LED bar graphs are fairly cheap and small.
Audio Level Signal Grapher : 9 Steps - Instructables
https://www.instructables.com/Audio-Level-Signal-Grapher/
Analog DA Mono/Stereo/Level Bar Graph • Link Electronics
https://linkelectronics.com/product/analog-da-mono-stereo-level-bar-graph/
Link Electronic's DigiFlex 1651 Stereo Audio Distribution Amplifier takes advantage of the latest in Operational Amplifier technology. The 1651 has logarithmic bar graph level meters for the left and right channel signal indication. The front end is high-impedance, balanced, with high commonmode rejection.
Arduino Analog Signal Graphing on a TFT Touch Screen : …
https://www.instructables.com/Arduino-Analog-Signal-Graphing-on-a-TFT-Touch-Scre/
The audio signal is graphically displayed twice; once in the center using a line graph and also on the bottom with a bar graph. The top graph represents the photo resistor signal. Touching the screen pauses the graph and opens a menu to adjust setting for the graphs. You can change the color and direction of each graph.
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