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The existence of the peak indicator "Audio Peak Indicator" in an audio device is needed. Audio Peak indicator is a simple circuit to detect the peak level of audio signal. Audio Peak indicator circuit is built with duabuah transistor and LED indicator as peak level detection of audio signals. The main function of a series of Audio Peak indicator is to determine the occurrence of the peak level of audio signal that is more than +4 dB, equivalent to 1.25 V rms. If the received audio signal Audio Peak Indicator more than +4 dB was the LEDs in series Peak Audio This indicator will light. Audio Peak indicator circuit is mounted on the output audio system. Audio Peak Indicator Component List: R1 = 10Kohm R2 = 1.2Kohm R3 = 220Kohm R4-5 = 4.7Kohm C1 = 47uF 25V C2 = 2.2uF 25V Q1-2 = BC550C D1 = LED RED We hope to form the reference materials in the manufacture of circuit pernagkat Audio Peak Indicators in the audio readers.

The circuit diagram shows a low-cost, fast responding, peak holding, audio level indicator. The sensitivity is determined by preset P1, which (sort of) DC-biases the input of Schmitt-trigger gate IC1a to a level close to the switching threshold. When the negative peaks of the audio signal cause the output of the first Schmitt trigger gate to go high, the capacitor on the input of the second Schmitt trigger gate rapidly charges via diode D1. The charge can only disappear via the 1-Mohm resistor, R2, so a fast attack, slow decay is the result. In this way, even the fastest peaks will be caught and indicated by LED D2. Four NAND gates in a single 4093 package make a stereo version. A multiturn quality trimpot will ensure easy adjustment and stable function over time. Circuit Diagram : Stereo Peak Indicator Circuit Diagram The circuit is based on a standard CMOS IC and will work from any supply voltage between 5 and 15 V. Author : F. Jensen - Copyright : Elektor