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switching tip 29 — Parallax Forums

switching tip 29

rrrr Posts: 63
edited 2006-01-16 20:25 in BASIC Stamp
·i would like to switch a cold cathode inverter with my basic stamp. the inverters run on 12 volts dc and about 600 ma. i got some tip 29a transistors from a friend and after looking at the data sheet·i figured they would work just like a 2n2222. but they dont seem to be switching. when i turn power on they just let the juice through and the cold cathodes light up. i know i probably need some fly backs diodes or something too.
thanks for your help...

Comments

  • NewzedNewzed Posts: 2,503
    edited 2006-01-16 20:01
    Try a TIP120.· They are· Darlington transistors, and will handle 5 amps.

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    Do you have a Stamp Tester yet?
    http://hometown.aol.com/newzed/index.html

    ·
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-01-16 20:25
    To answer your question on the TIP29a would require the datasheet, but you may need more current, hence a different resistor on the base to drive this transistor.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
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