HAL9000

JD
Nicely done! I hope you don't fry that led. I don't see any resistors between it and the 9v battery, and that led is probably 3v. I'm still learning electronics so I'm not entirely sure, but a burnout would be unfortunate if everything is glued up tight. Hope not!

Brian Snow
Hi JD, I did some calculations on the current limits of LEDs. While I had to guess what the spec limits on this LED were, most of them have a voltage drop of about 2V, so with a 9 volt supply and a desired current of about 25mA (typical of these LEDs), I calculated the resistor to be ~280ohms. Thus I used a 300ohm resistor. The LED is noticeably dimmer (still plenty bright) but I'm sure a lot less stressed and likely to not burn out. Thanks for the thought. I'm surprised Mobius models didn't include a resistor in their pre-built electric circuit that comes in the kit.

John Hughes
Pity the original didn't have a simple OFF switch!

Julian Herrero aka Yuri
Very original ,,,, following ,