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Amazon.com: analog stereo input mini jack
https://www.amazon.com/analog-stereo-input-mini-jack/s?k=analog+stereo+input+mini+jack
Arduino Audio Input : 8 Steps (with Pictures) - Instructables
https://www.instructables.com/Arduino-Audio-Input/
Wire the signal from the mono jack to the non-inverting input (pin 3) and connect the ground pin of the jack to the 0V reference on your voltage supply (for me this was the junction between the two 9V batteries in series). Wire a 100kOhm resistor between the output (pin 1) and inverting input (pin 2) of the op amp.
How to input sound from device into the Arduino's analog ...
https://www.quora.com/How-can-I-input-sound-from-device-into-the-Arduinos-analog-pin-via-the-headphone-jack-I-would-like-to-make-LED-reactive-lights-with-it
You need to bias the analogue pin at half the reference voltage (2 x 10k) and couple the signal to it via a 0.47uF capacitor. If you use the internal reference, then you only need 1volt peak to peak on the input for full scale ADC reading 0 to 1023, biassed at around 511–512. 243 views. ·.
Audio / Video hardware connectors pinouts diagrams ...
https://pinouts.ru/Audio-Video-Hardware/
RCA connector An RCA cable/connector (also phono connector or Cinch connector) used to transmit analog audio and composite-video signals between devices such as TV, satellite, cable receivers, VCRs, game console systems, speakers and more. The connectors are also sometimes referred as A/V jacks.
Arduino: Read frequency of input from audio jack
https://arduino.stackexchange.com/questions/21157/arduino-read-frequency-of-input-from-audio-jack
You will need to make sure that the input is in the range for triggering the input circuitry of the Arduino. It should be around 4 to 5V, and not higher than 5V (for a high). It also should not go negative. Something like this will protect the input pin: Warning - audio from an audio jack will be AC and it will go negative. Make sure you use a suitable input protection.
Amazon.com: digital audio output jack
https://www.amazon.com/digital-audio-output-jack/s?k=digital+audio+output+jack
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