[pserwylo]

As somebody who is learning electronics using Arduino right now, I almost agree with you.

WARNING: The first time I accidentally forgot to put a resistor in front of an LED and sent 50mA to one which was rated at 20mA, I expected it to fizzle and cut out like a regular incandescent light bulb does in my house.

When it literally exploded and the plastic covering went flying through the room, I was very very glad it didn't hit me in the eye, or I'd probably have done some fairly serious damage.

[harrytuttle]

Yes this is always 'interesting'. I'd personally suggest that everyone at least stuffs the following components over a 30v DC 5 amp supply (in a fume cupboard with goggles on) at least once just so you know when to wince: electrolytic capacitor reverse polarised, 1 ohm resistor, generic npn transistor (base-emitter forward biased), various LEDs, signal diodes.

you learn to double check your circuits first then :)

[photojosh]

What about getting your H-bridges the wrong way around and the smoke hitting the ceiling... the night before your final project is due?