Blinking leds

Step 1 Step 1

This project will work this way, you connect 4 leds in the +12V from your computer, they are soldered to a 2 position switch that will connect to a component called TIP31, this component gets the intensity transmitted by the P2 connector, and with that, makes the leds blink with the music.



You can follow this scheme:

Comments

[ST4N13Y]

could i use TIP33 ???? ....and....what i need to change in this scheme if i want to ude 9volt battery ??? thank you very much

[Algag]

add a resistor to the leds or take off an led because they are wired as suck there is a 3v drop (they are 3v each) across each LED so four is the max it could hold BUT if you used 1.5v leds and a 9v battery you could put on 6 leds in that pattern

[kishansukumar]

wud a tip32 work insted of a tip31? does it make a diffrence?

[Algag]

 tip32 is pnp not npn

[laptaper]

help me please.. cant get my light to flash.. im using tip31c.. please help me with this..

[daystoolate]

this wiring diagram sucks. The way you have it drawn makes no sense as there are 4 negative leads coming off of the 12v supply. Your switch will not work in this diagram because either way that you flip it, there will be a ground connection. If you flip the switch toward the transistor, you may be able to get this thing to work. But you have a ground connection on BOTH SIDES of this switch. Unless your goal her is to turn off the P2 input and leave the LEDS on solid, then the bottom ground on this switch is not needed. Here is a wiring diagram that is more accurate than this one.

[pyro-jim]

I admit it isn't done very well but what you are saying is wrong. The SPDT switch allows the LED's to either flash to music or be on solid. The bottom ground connection is needed so that when in the permanently on mode the circuit is completed

[bmxlive]

Hi, wich transistor would i use if i want the circuit with 12Volts LEDs

[aussiecowslip]

what does the X mean?

[Algag]

 its unused in the diagram from he instructables maker(i like that one better) he makes it so you can leave the leds on solid or make them blink

[xmastex]

hey man, is the RED wire the positive and the BLACK the negative one?

[daystoolate]

Yes

[hansengel]

Uh, nooby question here: after acquiring a P2 (3.5mm stereo jack), how do I access these "3 pins" you mentioned? Do I have to strip off the covering of the jack?

[pyro-jim]

You can strip of the cable revealing 3 small enameled wires. You must strip off the enamel to get to the copper underneath. An easier way is to cut away the molded plastic around the jack.

[hessam]

is there any way to hook up more than 4 LEDs to it or do I have to just make multiple ones?

[deko69]

yup just make a parallel connection with for example 4leds in one row if you are using 12V and then add another row(4+4=8 etc)

[exr1c]

Would this work If I were to use a passive input source such as a guitar pickup?

[daystoolate]

The p2 sends a positive current to the P lead on the transistor, which causes the collector to open and pass the negative current through to the leds. The way a transistor works, is when the audio reaches a specific voltage, it opens the gate on the transistor, illuminating the LEDs.

[vatosupreme]

nice instructable. I really like the wiring diagram with the pictures of the components.. Makes it much easier for to figure out..