/diy/ - Do It Yourself

>>254747
Fluke is good, you won't need to buy another one for years, if ever.

>>254386
Use carriage bolts, then. Get them a longer length than you need and bend them over with a hammer once you've tightened them down so they can't be removed easily.

>>254398
Or there are brushes worn out.

>>253985
Very likely not, but I at least provided a link to a site about building one, so nobody can tell me I'm not being "positive" and "encouraging" to budding young DIYers, or whatever.

>>254017
Go back to /b/ and troll harder, child.

>>254027
Just FYI, the first pic is an "external tooth lockwasher" and the second is "internal tooth lockwasher".

>>253833
http://hem.passagen.se/communication/plis.html

As you can see it's no trivial matter. Good luck with that.

>>253671
Wouldn't you have to have a pretty powerful laser to do this, and therefore a massively powerful power source for said laser? That you'd have to haul around with you?

>urban climbing and rappelling
Is it just me, or does it sound to anyone else like OP is looking to become a second-story guy?

>>253692
Hmm, didn't look too closely at OP's pic the first time around. Now that I do, it looks like the second transistor really should have a resistor between base and emitter to help it stop conducting when the first transistor stops conducting.

>>252697
I remember that thread.

The general consensus was: It can't be done with current technology, it's something that only exists in video games and science fiction.

>>253521
>computer power supply
Honestly, I think this application would be better served by a big linear power supply with big filter caps, because of the intermittent high current spikes necessary for bass frequencies.

>>253601
*nodding*

I think if anything a radio modem setup would be the most practical solution. They don't require any sort of licensing, and with a good antenna setup you can get some decent distance out of them, and the datarate on some of them isn't totally unreasonably low. You wouldn't want to play a first-person shooter over them, but for normal internet browsing and email it would work fine.

>>253576
Also, if voltage drop across the diode == ~zero, diode == blown; they tend to short out rather than open when you overload them.

>>253435
What is the oscillation frequency of your inverter circuit? You might want to try using a Schottky rectifier diode instead of a garden-variety 1N400x diode, they have a higher switching speed. And, as someone else suggested, put a current-limiting resistor between your rectifier and the storage capacitor you're charging so you don't drag the whole circuit down when the cap is discharged.

>>253459
I don't think it's a felony, but I think they would confiscate equipment and/or make you pay a fine for every day you were in violation of FCC rules.

>>253536
You wouldn't really be "living off the grid" this way, you'd have to have a generator or a pretty big solar array with a bank of storage batteries to keep your transceiver setup working.

>>253456
Technically possible, but I think the datarate would be rather low, you'd need two distinct channels for full-duplex operation, and (don't quote me on this) I don't think FCC rules regarding use of the amateur radio bands would allow this, or at least you'd be limited to certain bands. Check with them on that, my information is way out of date but I do believe they still get rather pissy over misuse of the airwaves

If the goal is to have internet access in the middle of nowhere wirelessly, might I suggest radio modems? I can't remember who made them, but at one job I had we worked with some dataradios that had ethernet connections to them, and operated as a transparent wireless bridge, which means once you had a pair of them set up, all you had to do is plug into them and you're good to go. I think the range was something on the order of 20-25 miles with decent gain antennas, better if you know where you're going and can set up and use directional antennas for higher gain. There's also cellular modems using a wireless provider's network, but you'd have to pay for the service, there's satellite internet service (not cheap, and while the speed might be good in the right circumstances, the latency is very high), and if it's only a couple miles you need to go with it, you can get amplfiers for WiFi to feed into high-gain outdoor antennas.

>>253425
I'm not going anywhere, deal with it.

>>253507
Has it occurred to you that by putting a lock on it, you're drawing attention to it for anyone that handles the book? The whole idea of hollowing out a book to use to hide things is that you're hiding them in plain sight.

..and by the time you get done buying all that stuff, figuring out how to put it all together, write all the software to make it work like a smartphone, and trick a cellphone carrier to let you use it, you could have bought a smartphone and been done with it.

Some things are not meant to be a hobbyist /diy/ project. There is a cellphone kit out there I've seen, but it's not what you want it to be. Get a summer job, make money, buy a phone, if that's what you really want.

>>253099
>125V
Are you sure about that?

>>252987
Do they work?
Sell them for a few $$$, now you have a few extra $$$.
Otherwise why dismantle them? You might need them at some point.

>>252805
I'd think for the cost of the bearings you could get an entire replacement motor.

>>252863
Really, in all seriousness: We've got mostly youngins here on /diy/ that make posts all the time that amount to this:

o Got junk anyone else would throw away
o What can I make out of it?

They've got no money (and usually no car!) for anything like this. I.E. this is the wrong demographic for this sort of post. You'd be better off on /o/.