audio peak level indicator by op amp

Posted on Feb 6, 2014

No setup is required: if correct values are used for resistors R3 to R7, LED D1 will illuminate at 0dB input (0. 775V RMS), LED D2 at +5dB input (1. 378V RMS) and LED D3 at +10dB (2. 451V RMS). The circuit was optimized for low current consumption as it was intended for battery operation. To achieve this, the best arrangement has proven to be the one

audio peak level indicator by op amp
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using two different op-amp types for IC1 and IC2. In fact the LM393 IC was not operating satisfactorily as dot-mode LED driver, whereas the LM324 was unable to charge C2 in the linear way, as expected. Therefore, the final circuit is some op-amp wasting, but the small added cost will be quickly compensated by battery savings.

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