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Creating an Audio-Reactive LED Circuit : 10 Steps ...
https://www.instructables.com/Creating-An-Audio-Reactive-LED-Circuit/#:~:text=A%20NPN%20transistor%20is%20a%20current%20controlled%20switch%2C,current%20to%20flow%20through%20the%20LED%2C%20illuminating%20it.
LED powered by audio signal - All About Circuits
https://forum.allaboutcircuits.com/threads/led-powered-by-audio-signal.18555/
The LM3915 bar-graph IC's datasheet has some peak detector circuits. If the max power to a speaker is 60W then the voltage at the speaker is 21.9V RMS if the speaker is 8 ohms. A low sound level from the speaker is caused by a signal that is 0.22V RMS. You must log in or register to reply here.
Driving LEDs from audio signal - Electrical Engineering ...
https://electronics.stackexchange.com/questions/36423/driving-leds-from-audio-signal
The BC337 has a Vce of 0.9V and hFE of 80 @25C @ 350 mA meaning the power rating (250mW) of the part is greatly exceeded and it would burn out with approximately 0.9V*0.35A drop (315 mW). So it fails with too high Vce saturated voltage, too low hFE @ 350mA, even though hFE is high and OK for 20mA LED's it falls from 600 to 80 for these LEDs.
Creating an Audio-Reactive LED Circuit : 10 Steps ...
https://www.instructables.com/Creating-An-Audio-Reactive-LED-Circuit/
1) Connect the audio jack end of the Y Cable to one of the audio splitter inputs. 2) Connect the headphones or speakers to the other audio splitter input. 3) Connect the other end of the audio splitter to the MP3 player or computer. Ask Question Step 9: Enjoying the Result 1) Ensure that the volume on the device is turned all the way up.
Can led lights be powered by audio signal? - Techtalk ...
https://techtalk.parts-express.com/forum/tech-talk-forum/7400-can-led-lights-be-powered-by-audio-signal
> power supply or if they can somehow use the > audio feed for power and therefore only be > lit up on when music is playing. Sure, you need a bridge rectifier, a 10uF capacitor and a resistor. Rectify the incoming speaker signal, filter the voltage with the 10uF cap and connect the LED in series with the resistor. For up to 100W, use a 1.3K ...
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