Audio-Driven Flashing LEDs

This project appropriates some instructions from this instructables.

Jared built this circuit on 10/29/15.

Here is a schematic of the circuit, it includes the following parts (from left to right):

• 12V power supply (I used an old wall-wart from the Boneyard.)
• Resistor/LED combo (I used one high-intensity blue LED arrays that Brad donated.)
  • If you need help figuring out your resistor value for the LED(s) you've chosen, use this resource.
• TIP31c Transistor (I bought them here)
• Audio input (In this schematic it is listed as a TRS jack.)

One main problem with this circuit is that a standard line-level audio signal from a portable media device or a computer is not loud enough to drive the transistor to light up the LED(s), so I used an old pair of desktop computer speakers (also from the boneyard) to act as an amplifier; so that the amplitude of the audio signal the system received would be loud enough to light the LED(s).

If you're attempting to tackle this project, Feel free to stop by the Learn-a-thing or whenever and ask Jared about it if you need help!