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AN1991 Audio decibel level detector with meter driver
https://nxp.com/docs/en/application-note/AN1991.pdf?cid=Brand_nxpdatafeed-web_third_party-06_05_13
Audio decibel level detector with meter driver Figure 2 shows that the circuit is within 1.5 dB tolerance over the 80 dB range for audio frequencies from 100 Hz to 10 kHz. Higher audio levels can be measured by placing an attenuator ahead of the input capacitor. The input impedance is high (about 50 k ), so
Twilight Technology 2252 - RMS Level Detector IC
https://ttsemiconductor.com/main.asp?uri=1003&di=199
Based on technology originally developed at dbx, our level detectors are used by manufacturers of compressors, limiters, gates etc. to determine the level of audio signals. The TT Semiconductor 2252 integrated-circuit rms level detector is designed to convert an AC input current into a DC output voltage. The output is proportional to the log of the true rms value of the input signal.
Audio ICs Mute detector IC for 3V sets
http://www.suzushoweb.com/pdf_file/473bf28226a1d.pdf
Audio ICs Mute detector IC for 3V sets BA3708F The BA3708F is a mute detector IC for 3V tape players. When the signal is higher than the input decision level V IN and longer than the song detect time, a pulse of width T W is output after the pulse delay time T D which begins when the input signal ends.
Audio Sound Level Meter-LED Sound Level Meter using …
https://www.circuitstoday.com/sound-level-meter
Description. This is a one-chip sound level meter that can be used for displaying the sound level of an amplifier or simply the sound level from a microphone. The heart of the circuit is IC LM 3915 Audio level IC. Even though it is a stand-alone IC, a peak detector based on Transistor BC 558 and diode 1N4001 is also included for better performance.
THAT Corporation 2252 RMS-Level Detector ICs
http://thatcorp.com/2252_RMS-Level_Detector_IC.shtml
DESCRIPTION. The THAT 2252 integrated-circuit rms level detector is designed to convert an AC input current into a DC output voltage. The output is proportional to the log of the true rms value of the input signal. Fabricated in a super low-noise process, the 2252 combines wide dynamic range with frequency response to beyond 20 kHz.
Sine Systems, Inc. | DIY Audio Detection Circuit
https://sinesystems.com/support/rfc1/rfc1_diy_audiodetect.shtml
The schematic for a very simple audio detector is shown below. Any audio level of -6 dBv or greater will maintain at least 0.5 volts DC at the output. This covers most "line level" audio sources. If greater audio sensitivity is needed, use germanium diodes (1N34) or Schottky diodes (1N5819) for D1 and D2. Audio Detection Schematic Setup
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