LED's flickering to music PT2

Thread Starter


Joined Dec 11, 2011
Audio Guru helped me out with a circuit, and here's the final look of it;

I plugged in the 12V DC power supply and all 36 LED's turn on. When I plug in my phone to the audio in, the LED's aren't flickering. Any thoughts?


Joined Nov 30, 2010
This chip needs positive AND negative voltage supplies. With no input, the output of this circuit is very close to zero volts and it's only natural that 12V through the LEDs will conduct current to a zero volt output pin.