No, not really, especially if you're dealing with stuff 1990 and newer. The gold is minimal and takes too much work and time to be worth it.
If you happen to come across some boards though, tantalum caps can go for a pretty penny, as do transformers and electromagnets (lots of copper and magnets are cool). Variable caps are nice to have around too.
I am building a little and cheap anemometer mainly from scrap parts (pic related). The center is just a random plastic cap, the cups are made of ping-pong balls and the sticks are from a plastic model kit. I am planning to use an old 2½" hard disk drive spindle motor as a pulse output sensor.
Are there any formulæ for estimating the rotational speed vs. wind speed for a 3-cup anemometer of given dimensions? Only information that I've found deal mostly with topics like aerodynamics but the mathematics in those scientific papers is quite involving.
>>945193 you should be able to convert speed of the cups to rotation speed with some maths, very simple. the point of an analmometer is that its light and very very low torque so it should spin at the speed of the wind.
if you want to calibrate it i would suggest a wind tunnel. they have fancy sensors which find pressure differences like pitot tubes
GF screwed up with a piece of second-hand lab equipment (115 V) and plugged it in with a 250 V cord. (Specifically a Forma 3130) What are the odds that there is some fuse protection and the board isn't fried. She texted me after plugging it in, it running for a few seconds, and the magic smoke came out. I've looked into parts and there should be a 1 amp fuse somewhere.
>>945172 It's probably bad news. First, fuses don't normally produce smoke when they fail. Second, you can't protect electronics with a fuse; a fuse takes tens or hundreds of milliseconds to fail, a transistor takes a fraction of a millisecond, and an IC will fail even faster.
OTOH, electronics doesn't usually run directly from mains voltage, and a power supply shouldn't propagate mains voltage in the event of a failure, meaning that it shouldn't have fried anything other than the power supply,... Comment too long. Click here to view the full text.
Got this idea for a ocd-nightmare clock. Basicly it would be just a regular clock, except that the movement of the seconds hand will be independent - having its movement be complete random mess, slowing down, speeding up, stopping completely, even going backwards, etc. You would be able to tell the time just fine since the hours and minutes hand would still work normally.
It just want to have the clock look like a fucking mess. How would I go about making it?
Hey /Diy/ First time here, anyway I have a class project where I need to demonstrate on how to do something in the class. I'm completely out of ideas. I thought about how to build a computer, but I'd rather not bring my desktop all the way up to the campus. Anyway any idea is appreciated.
for a design project me and 2 other folks are looking to make my own wearable device like fitbit, but with other sensors too (3-axis accelerometer, skin temp., ambient temp. + humidity, electrodermal activity, pulse rate, blood oximetry attachment).
I'm trying to include a bluetooth module but i'm curious how that works, does each bluetooth module come with a unique PIN that allows you to pair it with a computer?
Virtually any air compressor will run a nailgun. They're about the lowest-consumption air tools you can get. I mean, a tiny pancake compressor might have issue with you using framing nailer like a madman, but, short of that, it doesn't matter all that much.
That's assuming you're only going to use it occasionally, though. If you're using it for heavy nailing on the regular, you might want to look into something larger. For smaller nailers or infrequent work, anything will work.
I'll admit I have no idea exactly what you mean by "take... Comment too long. Click here to view the full text.
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