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October 6, 2005
plane stuff

Test flew my RC plane with camera mounted in it today, was fine. Balance good, weight not too bad, added power draw seemed OK, etc. Didn't have the receiver for the camera, though, so I don't have any video footage of it.

The main thing left to fix is that when the motor is on, the power gets so noisy that the camera starts fucking up. So after researching online, I've decided to go to Radio Shack in the morning and buy the appropriate resistors and capacitors (well, just one of each really), and build a lowpass filter. Judging by how the video looks when the noise is there, it appears to be correlated to the speed of the motor (the motor probably spins at upwards of 2000 RPM), so it seems relatively easy to build, say, a 30Hz lowpass (which using a 2.2 ohm resistor and 2200microfarad cap will give me a (workable) voltage drop of 0.2 volts, at 80mA load), which will hopefully take care of it. I'll buy some variety of resistors and capacitors to tweak the filter once I see how it works, too. Fun fun, math meeting electronics, mmm. I'm not sure what the frequency response curve is for a lowpass like this, so I'm shooting really low. Anybody have any experience with doing this? :) I guess I'll find out if I'm completely wrong...

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