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rr
01-17-2006, 03:56 AM
·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...

Newzed
01-17-2006, 04:01 AM
Try a TIP120.· They are· Darlington transistors, and will handle 5 amps.

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

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Chris Savage
01-17-2006, 04:25 AM
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 (mailto:csavage@parallax.com)