Arduino Forum

Using Arduino => General Electronics => Topic started by: fillbob1 on Feb 17, 2013, 11:51 pm

Title: What transistors have around a 2-3v turn on
Post by: fillbob1 on Feb 17, 2013, 11:51 pm
Thank you!
I'm trying to make some LEDs blink to the music right from the speaker to make a cool LED show.
Would/should I use transistors, MOSFITS or something else?
I plan on just using transistors should campasistors be used too, I don't really know
but what would the scamitic look like?

please help!!
Thanks!
Title: Re: What transistors have around a 2-3v turn on
Post by: majenko on Feb 18, 2013, 12:13 am
In what way do you want the LEDs to blink?  How are you thinking of connecting them up to the sound source?

Title: Re: What transistors have around a 2-3v turn on
Post by: Grumpy_Mike on Feb 18, 2013, 12:15 am
In reply to the title all bipolar transistors turn on a 0.7V.

In reply to the body:-
http://www.arduino.cc/playground/uploads/Learning/solenoid_driver.pdf (http://www.arduino.cc/playground/uploads/Learning/solenoid_driver.pdf)
Just put your LED and resistor in place of the solenoid.
Title: Re: What transistors have around a 2-3v turn on
Post by: nickgammon on Feb 18, 2013, 12:52 am
http://www.thebox.myzen.co.uk/Tutorial/LEDs.html

Title: Re: What transistors have around a 2-3v turn on
Post by: fungus on Feb 18, 2013, 04:11 am

Thank you!
I'm trying to make some LEDs blink to the music right from the speaker to make a cool LED show.
Would/should I use transistors, MOSFITS or something else?


It depends on how complicated you want to make it.

You can get LED driver chips that do it quite easily:

eg. http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=KA2284&_sacat=0&_from=R40

Title: Re: What transistors have around a 2-3v turn on
Post by: retrolefty on Feb 18, 2013, 04:14 am
Quote
should campasistors be used too


I don't think campasistors are due to be invented until sometime next decade.  ;)

Lefty
Title: Re: What transistors have around a 2-3v turn on
Post by: Docedison on Feb 18, 2013, 04:20 am
@ Lefty... That was covered in the NDA you signed.., You'll be hearing from the Secret Police.. Secret Division...

Bob
Title: Re: What transistors have around a 2-3v turn on
Post by: majenko on Feb 18, 2013, 06:04 pm

@ Lefty... That was covered in the NDA you signed.., You'll be hearing from the Secret Police.. Secret Division...

Bob

If they're that secret, he won't be hearing from them.  No one will.

Shhhh.....
Title: Re: What transistors have around a 2-3v turn on
Post by: BulletMagnet83 on Feb 18, 2013, 06:36 pm

Quote
should campasistors be used too


I don't think campasistors are due to be invented until sometime next decade.  ;)

Lefty


I dunno... some of the tropical fish caps look pretty camp to me ;) FABULOUS colours.