These are high quality BJT NPN transistors that work well with audio applications, made by ST Micro.
This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.
Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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You're right! Wow... That's some profit margin!
Is that price some kind of typo or something? I can get these for $.08 from Jameco...
I seriously doubt that SF is making a huge profit on these. I suspect that the price reflects the cost of keeping them in stock for people like me that need 3 of 'em, but are 200 miles from the nearest Radio Shack. Yeah, I could order from Jameco, Mouser, or DigiKey, but it's not like I can send them a quarter and an SASE and get 3 transistors and a penny by return mail.
Question I dont know anything about these. I need them for a project? how DO i know which leg is which?
Look at the datasheet in the description.
Can someone point me towards a tutorial / sample circuit that demonstrates using one of these?
I'm interested in knowing what voltage is required at the "B" leg to enable voltage thru C to E. Can there be different voltages between B and C/E? Meaning - can I use 3v on B to enable 5v thru C to E?
Here's another http://electro-music.com/forum/viewtopic.php?t=51780
Yes - check out Electronics Tutorial about Transistors as Switches