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Line-level-sensing power relay - Audio - Arduino Forum
https://forum.arduino.cc/t/line-level-sensing-power-relay/355596#:~:text=Typically%2C%20the%20line%20level%20is%200dB%20%280.775V%20RMS%29%2C,to%20detect%20%22safely%22%20a%20signal%20from%20the%20Chromecast.
Arduino Uno synthesizer - Line Level (audio) output to ...
https://arduino.stackexchange.com/questions/8100/arduino-uno-synthesizer-line-level-audio-output-to-mixer-amplifier
PWM output (pin 9, 10) -> voltage divider to 2.5v -> RC Low Pass Filter 15Khz -> LM386 amp with volume control -> mono jack output -> mixing desk -> amplifier -> speakers (the TMRpcm and ToneAC library share the same pin (9), I have fixed this by disabling the TMRpcm when the ToneAC is playing and vice versa.
Line Level - Audio - Arduino Forum
https://forum.arduino.cc/t/line-level/101009
Anyway, according to this Wikipedia article line level for consumer audio appears to be around 0.447V peak: http://en.wikipedia.org/wiki/Line_level The key word here is around ;) I get just under 1V peak (~.7V RMS) from my laptop's headphone output, and about 2V peak (~1.4V RMS) from my CD player's line-out.
Arduino Audio Output : 10 Steps (with Pictures ...
https://www.instructables.com/Arduino-Audio-Output/
To calculate the voltage that this will output from the DAC, we use the following equation: voltage output from DAC = [ (value sent to PORTD) / 255 ] * 5V so for PORTD = 125: voltage output from DAC = ( 125 / 255 ) * 5V = 2.45V The code below sends out several voltages between 0 and 5V and holds each for a short time to demonstrate the concepts I've described above.
Arduino Audio Sound Level Meter : 5 Steps (with Pictures ...
https://www.instructables.com/Arduino-Audio-Sound-Level-Meter/
- Amplified audio signal voltage fed to the analogue input port A1 of Aduino nano (You can use any of analog port available) - Received input voltage by Arduino is in range of (0.3 ~ 0.5V) and it’s my VR setting of Adafruit break-out board (When you setting the VR differently, output voltage range will be different from mine)
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