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An Economical Digitally Controlled Audio Level Indicator

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The design of an accurate, inexpensive, compact easy to read audio program level indicator has always been plagued by compromises. The best of the previous designs used light emitting diodes (L.E.D.'s) in a bar graph arrangement driven by digital logic. This paper describes an improved method of driving the L.E.D displays which is considerably cheaper and simpler than previous designs. The circuit design, operation and performance are discussed.

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