2 more posts in this thread. [Missing image file: 457897236.jpg]
Hey /diy/ I need some advice. I work at a apartment complex doing grounds and I often find working or broken electronics (Virus filled laptops that people throw away because they're slow, hard drives, keyboards, LCD monitors, etc.) I'm looking for things to do with tons of working computers. I thought about making some kind of super computer network using gentoo but what could I actually use it for?
Aside from the working stuff, what can I do with the broken stuff? Any art project ideas?
>Picture isn't me, but the scene in my apartment is very similar.
21 more posts in this thread. [Missing image file: k.jpg]
Electronics engineering student here, school project time, we are supposed to use diodes and make a proyect that its supposed to be helpful and usefull along our careers, it doesnt have to be complicated as long as we design it
Since the mains at some labs (a bit old some of them ) are giving up to 137 volts and at home at night the mains voltage can go up to 132 volts i decided to attemp to use a zener diode as a voltage regulator
So a portable voltage regulator, this way if i decide to plug it at the lab or at home and be absolutely sure im using 127v when its plugged instead of 137 or more
however i still dont understand completely how power and current relation works, i do know
So at school this would look something like this
X being whatever current the load needs to work
however how can i know how many watts does the resistor to protect the zener diode has to be for this AC aplication if i will never know how much current the load of my breadbord circuits will pull so how can i make this without knowing that ?
also, i tried looking for a 127v Zener diode and i did not find any
so in the end i ask
Do 127v zener diodes Exist? (already tried newark, mouser and digikey only found 120v and 120v zeners)
How can i improve this,? mostly any feedback or corrections
pic semirelated, (same application but DC), what i want to do just take out the transformer, rectifier bridge and the capacitor
14 more posts in this thread. [Missing image file: roof1.png]
I would like to build a roof to go over part of my patio. I would appreciate some wisdom/insight.
I have provided a rough mockup and color coded it in case I am retarded and referring to things by the wrong name.
The white is my house wall (brick), red is patio(brick, concrete & stone slabs), green is grass.
I will attach a ledger made of 2" x 6" (x 4.5m) to the wall with anchor bolts.
The front posts (light blue) are 3" x 3" (x 2.4m). They would be secured in the soil with fence post spikes (possibly upgrade to concrete, but assume no).
The beam going over the front posts (and all the other dark blue rafters) will be 2" x 4".
The joists (yellow) will also be 2" x 4" (x 2.4m), attached to the ledger with joist hangers, and the front beam by half lap joints(ends) and cross lap joints(middle), and secured with angle brackets.
The rafters cross the joists with cross halved joints.
The supports (pink) are 2" x 4" and just secured with screws.
Polycarbonate sheets will cover the top.
I have done some woodwork before, but nothing on this scale, so I have a number of questions about the execution and effectiveness of this plan:
1. Will it be too heavy for the ledger or the posts to support?
2. Are anchor bolts the right thing to use, and if so, is 6 enough (ie 1 between each joist or 1 either side of a joist)?
3. Will cross halved joints reduce the structural integrity of the joists/rafters(enough to be a problem)?
4. Will it survive strong winds?
5. If the polycarbonate sheet extends 30-40 cm beyond the frame (over the grass) will it be likely to snap in the wind at some point?
6. The ledger position is fixed due to obstacles, giving the roof an approx 7 degree slope. Is this too little/much? Does it not matter at all?
7. There is a gutter ~6" above the ledger. There will also be a length of wood flush with the top edge of the ledger(but thinner). Do I need to worry about flashing?
7 more posts in this thread. [Missing image file: save.png]
Hey /diy/, could you help me figure this out?
Pic related is a schematic for wiring an Arduino to an EEPROM for reflashing purposes.
Pic related is also a revision of the original diagram, which is here:
Now, as per the circled areas in pic related, I am having trouble understanding what they are, they do not appear in original diagram.
Could /diy/ help?