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Sine Systems, Inc. | DIY Audio Detection Circuit
https://sinesystems.com/support/rfc1/rfc1_diy_audiodetect.shtml
The easiest way to set this up to detect loss of audio with the RFC-1/B is to connect the output of this circuit to a telemetry input and turn the calibration pot fully on (clockwise). Then set the upper limit for this channel to 9999 and the lower limit to around 0150. With audio present the channel will read "status on" most of the time.
Sound level meter circuit using LB1409 - ElecCircuit.com
https://www.eleccircuit.com/led-signal-meter-using-lb1409/
This project is a sound level meter circuit that easy and very cheap, can drive 9 LED display,The LB1409 is used as base of this circuit makes them has small size. This our circuit is simple that is designed in a modern style. Which uses the LB1409-IC1 alone, but can drive LED up to 9 LEDs. So provides light beautiful than the old.
AN1991 Audio decibel level detector with meter driver
https://www.nxp.com/docs/en/application-note/AN1991.pdf
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
Simple Sound Detection Circuit. Detecting Sound
https://picaxe.com/docs/picaxe_sound.pdf
from a microphone on an oscilloscope). Therefore to detect the highest sound level you need a reference point, and this circuit therefore only looks at the ‘negative going’ part of the waveform. By amplifying the point at which the sound waveform starts to drop back down again, you can identify the highest point of the sound level.
Sound level meter circuit using IC LM3914 - Gadgetronicx
https://www.gadgetronicx.com/sound-level-meter-ic-lm3914/
Working of Sound level meter: This circuit uses a electret microphone which is powered using a pull up resistor R3 . When there is a sound in the environment Electret microphone picks it up and this signal will go to pin SIG IN pin through Capacitor C2. This Capacitor C2 removes DC components in the signal. Now the IC LM3914 takes over.
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