Could I add more power and connect the headphones through this circuit?
1 replies, posted
I am currently trying to make an LED music visualizer that goes to music and attaches to my headphones. The ideal solution would be to have the LEDs run from the audio circuit from a smartphone (with a battery I would charge adding extra power), but I have also considered drilling a hole through my over-the-ear headphones for a small mic. So far, I haven't had that much luck, but I stumbled upon this circuit diagram:
https://files.facepunch.com/forum/upload/253536/2faaad3b-2e3d-42df-adc7-81e2b9eedeb4/fYQa6.jpg
This is 1N4148: 404
This seems to solve some of my problems but I can't figure out whether it analyzes each frequency or if all the LEDs would bounce at once. My main question, though, is how I would use this and my heap homes at the same time. Should I use a splitter to get two audio signals? Is there a way I could add more power and connect the headphones through this circuit to still hear music? Any help is greatly appreciated.
Firstly yes you would need a battery, the audio signal cannot really drive LEDs, the voltage also needs to be high enough to turn on the LEDs, each LED has a forward voltage of around 1.7V to 3.5V depending on the color, red being the lowest.
So if you wanted a series string of 5 LEDs you'd need a supply voltage at minimum of 8.5V, since this isn't often practical the preferred solution is to use a boost converter circuit which increases the voltage, these can be purchased as easy to use modules.
Frequency response is quite a bit more complicated, my advice is to use something like the MSGEQ7 along with an arduino nano to read it.
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