Sound Reactive LED Schematic
Lots of people have been asking me for a schematic for my sound reactive circuit shown here:
So without further delay, here’s the schematic:
Note: You’ll have to add resistors based on your supply voltages and your LED voltages. The two LEDs I used ended up not needing a resistor, but if you use a higher input voltage, or have less-powerful LEDs you’ll need to add a resistor between the + voltage and the LEDs.
Simharry3
I need some help with the tip31 transistor. My application is for the display panel of an old audio receiver I’m revamping. After a healthy share of internet research (although not enough), I decided to go with the tip31c. Well – the receiver is an 80W receiver and when I cranked up the volume a bit, the transistor sizzled and burned. My guess is that the 40W power dissipation rating for the TIP31 transistors meant that my 80W receiver was gonna blow it to bits. Great analysis for Capt. Hindsight. So do I need to go with a different transistor or should I forego the effort?
Hey, you could either try to find a transistor that is capable of switching 80w, or maybe what you could try (I don’t know if this would work) you could try putting 2 of the TIP 31 transistors in parallel, so that combined, they have a total of 80W dissipation… What I would do also, just to be sure, is add a third transistor in parallel so that you have a total of 120W of power dissipation, just to give you a little bit of headroom, so you don’t fry the chips. Good Luck, and tell me how it works out!