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Need help modifying project? Answered

Hey guys, I need help modifying a project. The schematics are provided and i need to keep only the bass part of the color organ (in red). How would I go about removing the other part of the circuit and powering an 16 inch long green led strip instead?Can anybody provide me an edited schematic of the project with the other part of the circuit removed and the transistor connections made for powering the led strip? Oh and someone was saying in the project video that the polarity of a few components are wrong, can someone point that out too? Help will be GREATLY appreciated.

Note: If you know that bass is low mid or high frequency please tell that too because i have a feeling that i have circled the wrong part of the schematic. The part I have circled is for low frequencies which i THINK is bass.

Another Note: The LED strip is green, 12v, 16 inch long and the flexible type. I dont really know the power consumption but i think that a 1 amp transistor will be enough.

(Video Link: https://www.youtube.com/watch?v=wJlglHS2w74)

Thanks in advance.
-Prickly Potato

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Wired_Mist

Best Answer 4 years ago

If you remove the High and Mid filters and only build the Low end filter (Plus all the bits on the left hand side) you should be able to skip the 2 led's and the 270-Ohm resistor and just plug the output of the 2n3906 into a small transistor like you planned!

1 Amp transistor will work nicely, the lights should only pull a fraction of that. I usually use a Tip120 but basically any n-channel transistor should work. Just check the datasheet for the max output.

Oh and also use a 100-Ohm resistor on the gate of the larger transistor to limit the current so you don't hit the max output of the 2n3906. (200ma)

Assuming you're going to use 12V to power this, you may need to change a few components to get the right responce so be prepared to try a few Configurations, take note on what components you use for each test so you can go back later and build the one you liked best.

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SA-DIY

4 years ago

Ok I edited the schematics. Will the transistor be enough for the led strip? And is the transistor wired right ? Cause' im not very good with transistors. I opened the datasheet and didnt see gate and stuff but base, emitter, collector. That was weird.

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Wired_MistSA-DIY

Answer 4 years ago

Yeah that should work; Try it on a bread board first though to make sure !

And pardon me, yes it is base, collector, emitter. mixed it up with a mosfet. sorry bout that >.<

Two more things, be sure to use a heat sink on the tip120, and test it with an old radio or something similar before you hook it up to a Computer, Cellphone or a fancy new MP3.

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SA-DIY

4 years ago

http://tinypic.com/r/1t7792/9