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First time i'm posting on /diy/ here. I'm thinking about making a small rocket propelled plane. I have zero experience in building planes and wanted to ask tips on the design.
I was thinking on making a simple KNO3 suger as fuel since the ingredients are easy to obtain.
My goals are making a small plane capable of going about 20-30 meters high and is able to stay in the air for a few min.
I'm thinking about making the plane out of wood, but i also have some scrap iron available. But i figure iron is too heavy.
My questions are:
- What would be the best design of the aircraft? (In example biplane, monoplane, tailles, etc.)
- Would it be wise to install one engine in the middle or 2 separeted along the wings?
Any tips are welcome.
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i guess a lot of you have build led walls, cubes or something similar, so i wonder if some of you are willing to share some experiences.
like how did you calculate the timings, how did you control them, etc
the reason i'm asking is that i want to build a huge rgb led wall, but i don't really know the math behind it.
let's say i'm using 4 panels, each 128x32 leds controlled by 1 µC a few pwm drivers and a shift register outputing 1 line at a time. is it possible possible to do it without flickering when playing animations or would be panel be too large ? how fast should the µC be to address all the pwm drivers in time for each line ?
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I bought a wahl peanut electric razor from the states, over amazon, and plugged it into my australian socket. Predictibly 240V was more then it could handle, and i blew up the resistor. The cover of the razor says 120V 60 Hz 3W. Using R = V^2/P, i figured the total resistance of the circuit is 4800 ohms, the resistor is 2500 ohms, and it looks like it's in series, so the rest of the circuit must be 2300 ohms. What i ant to know is if i can just use a different resistor, that gets the same power output but at 240V, or is there some electronics voodoo I'm not understanding?
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I Want to make a climate controlled terrarium and need some advice
>Good with digital electronics, okay with analog, decent at programming
>want to control temp, humidity, and run the lighting to simulate temperate climate.
I'm using a "daylight" florescent bulb for the sun, plus a basking light.
Thinking of a peltier cooler hooked up to a DPDT relay so the voltage can be reversed.
Saw some humidity sensors but I can't think of a way to control humidity on such a small scale.
I also need to somehow control a dimmable ballast with a microcontroller.