Electronics any1 know about transistors?

Discussion in 'Modding' started by FL@MeS, 23 Feb 2002.

  1. FL@MeS

    FL@MeS What's a Dremel?

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    lo,

    im using PCB's with 555 chips to control fan speed on my rheostat, but i need to know a code for the transistor that can provide enough power for most fans (12v, etc.) -- as the 555 can't handle it....


    cheers,

    ..
     
    FL@MeS, 23 Feb 2002
    #1
  2. cpemma

    cpemma Ecky thump

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    That'll be a PWM circuit, I assume. I've seen commercial kits with a 556 & a TIP122 power darlington with a 1k base resistor which will drive anything up to 5A and is easy to find.

    Try Kitsrus for the full circuit pdf file (Kit 67).

    With typical fans most any fairly-high-gain NPN transistor would be fine, a 2N2222A will handle 800mA.
     
    Last edited: 23 Feb 2002
    cpemma, 23 Feb 2002
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