Let's Make Robots!

Intro to Transistors

Well, I've messed around with tons of electronics and written plenty of code, but my most recent project was to build a motor driver. Or at least, drive a motor somehow with a few transistors. I have a few TIP122 and 127 power transistors, capable of handling plenty of current. I've spent a couple hours trying to get these guys to do what I want but to no avail :\

Can anyone give me a quick how-to on hooking up one of these and triggering it? Like a breadboard example? Or even just point me to an easy-to-understand website on these :)

Thanks for your help!

A multimeter question

Quick question- Why is it that when I set my multimeter to 9v battery it says my solar panel is putting out 0.89v and when I put it to 20v (not battery)  it says my solar panel is putting out 2.10v?

Problems programming...

I have been using my PICAXE 28X1 board with success for a while now, and I decided to move on. I have breadboarded a PICAXE 28X1, but programming success is a little iffy. 99% of the time, the download page comes up with a normal downloading screen, but only one dot loads.

 

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and then...

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FAIL!

Reuse Those Servos!

I'm kind of new here, so here is my first post. It might seem dumb at first, but I think it's a great idea. I've read a lot of posts about people frying their servos (hint: fritsl's cheap tiny blue ones, said so himself! :), so I came up with a money saving solution. REUSE THE SERVOS! YA! 

Servos are expensive after all, and they do have some good gears and they mount easily. So if you fry one, I wouldn't panic too much. 

See, why would you want to spend money on this-