I'm planning out my first bench power supply, just ordered all the parts I think I'm gonna need for this first try at it. If you have any features you would like to suggest I add, or just wanna post your own power supplies you made, please do so
Here's some rough specs for my own design
>LM317, LM337 dual supply (1.5A max on each) >about -20 to +20 VDC >2 ten turn pots, 5k >2 panel mount voltage and current meters (one for above... Comment too long. Click here to view the full text.
Oh, and no short circuit protection. The circuitry on that is a hassle too. The LM317 and LM337 can handle have the output shorted for a little while as long as the Vin - Vout is less than 40V. So I guess I would only need some sort of protection between -V and +V
you can use the 2-diode trick to make sure the output goes to 0V instead of 1.2V minimum. also, ten-turn pots are a pain in the ass. i'd go for the more traditional 2-series pots, for coarse and fine adjustment.
Removed a beam (been supporting something no longer needed), now I have a gap in the wall - whoever installed it, just cut the stucco (and partially the studs). Need to restore the wall now, but I'm puzzled with the material under the stucco (pic related). It looks and feels just like a soundboard, falls apart if pressed with just fingers, but its black.
What kind of material is this? If this helps, this part of the wall is about 8" above a single garage door, southern exposure.
>>1071759 That might be asbestos and depending on how much you handled it you may have exposed yourself to substatintial amounts of asbestos that can cause lung cancer years down the line and made the surrounding area dangerous.
>>1071150 There is nothing specifically magnetic about enamel coated wire which is why normal people call it enamel coated or simply enameled wire. People who say magnet wire are the same type of people who say ampacity instead of current (but don't say ohmage or farenheightage or milesperhourability.)
Hello I need some held with setting up lights on my driveway similar to the picture The driveway is about 20m long and there are LED lights on one side along the way. I want to set the lights so that they are turned on by motion. On the house side of the driveway I plan to use a simple IR motion sensor, which is not a problem. I have problem with the road side of the drive way. On the road side of the driveway I want to use a photocell or beam switch. (Sorry but I don't know the correct term, it is like a safety switch that you use on a sliding doors normally) I... Comment too long. Click here to view the full text.
>>1075842 >>So, uh what if you attach a phone with the speaker power wires instead rigged to a small motor. then like uh, used the motor to close an electrical switch. Then like, totse use that switch to like turn on one of those dollar store electrical lighters, so you can totally light fireworks. Like I mean turn off the call sound for everything except one number, and like call that phone from, china or something?
I might be moving to Australia in the nearish/mid future and I will have a way of shipping lots of heavy stuff for free like my amps in pic related.
My question is, is it likely possible or approachable to consider rewiring the transformers in the amps to run on 220V instead of their native 110V? Someone was telling me that depending on how the trans. is designed it might not be that hard.
I know I could probably get some of this stuff in Australia but it would be hard to find and really expensive and I won't have a lot of money to bring... Comment too long. Click here to view the full text.
Jaycar Electronics - www.jaycar.com.au - is the go to place in Australia for the sort of transformers you need, but check on the back of the equipment as it may already have a switchable transformer already built in.
The type shown in the pic above is an isolated stepdown transformer and will cost you between $119 and $419 (AUD) at Jaycar depending on how many watts you need.
You might find better priced transformers here - http://www.tortech.com.au/step-down-transformer-australia/isolated-step-down-transformer
I have 10 laser pens of the same type(cheap Chinese ones) in aluminum and the threads are a bit loose, is there any way to improve the friction for the threads by applying some friction grease/paste? its for adjusting the focus of the lens so right now there is a slight wiggling room that i would like to get rid of.
So the radio in my ae86 works but only plays on both front and rear passenger side speakers, the driver side speakers play, but they're very low volume. I know its an issue with the balance knob or internal balance circuit since it can restore the sound to the driver side when i jiggle the knob, but unfortunately i can never get it to stay in a spot where both speakers play. Since i have no idea how to diagnose or repair small electronics I took the radio to an electronics repair shop. After the technician said it'd take $220-280 to fix, I paid the diagnosis fee and... Comment too long. Click here to view the full text.
I want to add a led flashlight to my nerf blaster, which is powered by a 2s lipo, so 7-8.4 volts.
I'm aiming for around 100 lumens.
I found a 12 volt 9 watt led which is about as bright as I want, but I need to bring the voltage up to power it. http://www.ebay.com/itm/12V-9W-18mm-Eagle-Eye-White-Led-Light-Bulbs-Car-Tail-Backup-DRL-lights-QTY10-USA-/262502192964
This is where I'm a bit lost, I know I need a step up converter, but I'm not sure which ones will work with a LED, and work with the input range of 7-8.4 volts. Smaller... Comment too long. Click here to view the full text.
>>1075187 You want a constant current driver for the leds, since their forward voltage can vary with age,temp, etc. But those leds already have a step down constant current driver built in or maybe even just a resistor since they are so cheap. And desu, they are junk. Ive used them before and those generic chinese leds suck compared to a proper high power led. They are about 1w each max in reality. Buy a brand name led and an lm2596 with constant current will drive it happily (just set it to a reasonable current). But since you only want 100lumens buy those cheapos, and just connect them straight without a step up and they should work fine. If they dont, just open them and replace the resistor/driver they have with one suitable for your voltage.(Google led resistor calculator, you want about 100-250ma)
>>1075115 what do you mean by putting a drone on chair wheels?
do you mean one of those quad copter things with the propellers replaced with wheels, if so it wouldn't go anywhere, the wheels wouldn't touch the ground and just spin and make noise. however if you angled the electric motors so they were horizontal it would go, but i doubt it would maneuver like a silver fish (thankfully never seen one), because the change in rpm between the motors is slight so it would probably go like a bat out of hell but when... Comment too long. Click here to view the full text.
Hoping to get a bit of advice on how to deal with this chair I just found. I'm sure a decent sanding with some fine grain sandpaper will help it out, but what would be a good, simple, way to come at it after sanding? I just want to bring it to life a bit, and protect the wood.
>>1075085 So you need 150-600w. Just get an amp capable of putting out that much and put the speakers in a huge series/parallel chain to get the proper impedance. Get a 100w rms *2 receiver/amp and that should be plenty of power.
No electrician but, I play with amps (budding guitarists) and I know you can fuck up your amp by not matching the ohms of all the speakers to what the amp was designed for. And it makes a difference if you're wiring in series or parallel. There are calculations online.
Hello, i dont know if this its the place to ask, but i hope someone can help me out. The thing is, i found a stratocaster guitar without circuit and i buy it a new one (3 single coil, 1 5ways selector switch, 1 volume and 2 tones).
But, since i dont even play guitar, i dont even know how to wiring. I have 3 cables to weld (i guess, see pic related. 2 blacks an 1 yellow), and in the guitar i have the 2 cables coming from the jack, and one cable welded in the tremolo that splits i two at the other end.
How can i wiring this thing? I search in google, i search for... Comment too long. Click here to view the full text.
Recently moved into a new flat and used to dry my clothes on the balcony, but now that it's getting colder, that doesn't work anymore. They just take too long to get dry. A tumble dryer is not an option, there's no space. Neither is drying the clothes on a rack indoors, releases too much humidity.
Is there any way I can dry my clothes efficiently and cheaply during fall/winter?
When my drier crapped I use to hang mine wet clothes on the shower rod and towel rods with clothes hangers, put a fan in there blowing on them. Leave fart fan on to vent humidity. If really humid use small space heater as well. Dry over night
But even in-floor safes won't stand up to epic flooding unless they have a drain around the perimeter. Forget about them going underwater like in a flood.
TLDR: use tupperware
Now "building" a safe... While it's possible, you are better off buying one unless you make something like I did. It's a normal drawer blank/panel (on the outside) but steel plate on the inside and one heck of a stronger glide system.... Comment too long. Click here to view the full text.
Dear /diy/, I'm making a benchtop out of concrete. I know it's going to be heavy as a brick shit house, but it fits into the design. What are my best options for making it a little less heavy, and a little more clean? I've been looking at diy sites using fiberglass aggregate and countertop concrete forms. I'm considering EPS foam aggregate, paper aggregate, and watering down the cement to some awful ratio with fiber reinforcements. (I imagine I can compromise the strength-weight ratio a little bit)
If it's any better context, I'm... Comment too long. Click here to view the full text.
Hey /diy/. Looking for any type of costume accessory I can make using standard belts. I got a bunch of old ones ranging in the 32-40 inch range. I'm thinking a modded waistbelt and a bandolier. And suggestions or helpful tutorials? Google's been worthless.
>So I bought a beautiful house, got 1.2 acres. >In the way back I have a big pond lake. >around that land there is 30 yards by 30 yards of land that is uneven and it looks like that the water must have at some point or sometimes have risen you can tell by the way the grass looks. >I'm not worried about flooding at all, what my concern is building a flatter land perhaps concrete with the use of rocks all different shapes and sizes that I have around my... Comment too long. Click here to view the full text.
the land isnt that terrible uneven either its flat its self. Im just wondering the steps. of making an even land, and wondering if using all the different size rocks and combinging with concrete is best. Or actually building using water proof wood like you would see at a boat pier to put over that land as long as its above where the water rises
>>1074678 a secret altar, put a copper container filled with human blood on the circle, and then have a baby killed on the concrete, the grass will start to turn white and you will see a minor demon summoned close by which can then be asked to do a favor
Hello, I have started to get into welding, and I would like to know what rig is best for under 500$ that I could produce some serious welds and make some serious art. All replies are appreciated. Picture unrelated.
>>1074618 A lotos ct520 d. It's a inverter machine that can do stick and tig, as well as a plasma cutter function. Just be warned, he high freq will go out if you abuse it so be prepared to replaced the board. They are like 300 on Amazon and ar dual voltage. They also share the guts with every China inverter that looks similar so parts are cheap and they weld good.
>>1073858 >Does using vinegar + baking soda really help in breaking up/clearing grease in a sewer line? The only thing I've found to be effective is a snake, if the line is already clogged. Pouring in any kind of drain cleaner is just making a bigger mess to deal with.
If it's not totally clogged yet, you can try using dishwashing soap. A lot of times that works for me. 1. You run the hot water for 2-3 minutes, or until the water begins to back up into the sink, about 1/3... Comment too long. Click here to view the full text.
Hey I'm in the planning stages of a costume, but the costume has a metal mask I'll be casting out of either bronze or aluminium, but I wanted to put a microphone, speakers, and a push to talk button in it. I was hoping to have a mic attached to my right ear, which would have a simple pushbutton on it to activate the microphone. I wanted to push sound through two small round speakers at the chin, and I don't mind if the speakers are a little bit tinny. I'm wondering if anyone can point me to a place I could order parts from to keep it cheap and who... Comment too long. Click here to view the full text.
this is all stuff you can get at the dollar store, to take apart and remake. they even had an amplified mic at one time, called a spy mic. i bought a bunch of them, and they're surprisingly good if you replace the mic with one from an old phone.
if that's too cheap, you can probably find the headset from a dead Sony or Samsung phone sitting in a drawer somewhere, or from a friend.
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