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Showing results for tags 'circuit'.
Found 21 results
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I'm working on my final project and my professor will be out until finals are over. I am using 2N2222A NPN Transistors to power a DC motor to turn clockwise or counter clockwise. I created a diagram of how I would think it will work bunt I don't want to build it and find out it blows something up. I haven't had any electrical engineering classes and this is a computer architecture class. In a way this is the first I am creating my very own circuit and not just copying off from one of my labs. I did not have a lab that worked with transistors or making a DC motor turn clockwise or counterclockwise. If you can, please let me know if this will work or what I will need to change to make this work.
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From the album: FREEZER fail short circuit
condensation water spilled on gpu and motherboard. dried gpu and motherboard for about 30 minutes and it still works -
Can someone please explain how this amplifier generally works? Why are the resistors and capacitors needed?
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There's a new "hybrid" 3d printing process that is allowing researchers at the University of Sheffield to print materials like copper, fiber optic, steel and nitinol (nickel titanium) all at once in one build. I think this is super exciting to not just tech companies but home inventors who want to make their own gadgets in a small form factor but don't necessarily have the huge array of machines to do it themselves. 3d printing was a huge leap to allowing people to create at home, but when this technology hits consumers it'll change the game entirely. Now you won't even have to wire your circuit, you can just design it in CAD and print it. Solder in your components and you're done. There's also applications for education, as in teaching kids how electronics work and letting them make their own circuits. Basically I'm hyped about this. hbu? Source: https://all3dp.com/uk-engineers-thread-hybrid-3d-printing/?utm_source=wpn&utm_medium=wpn&utm_campaign=wpn
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I am really sorry if this is a stupid question, but i am just not able to get an answer for this. the closing lid of camera is broken, so i thought that if i connect the positive and negative sides of two cells with a copper wire, the camera should turn on because the circuit will be complete, am i missing something? also, i pressed the batteries down to the full extent, and then connected the wire, but the camera did not turn on, but when i press the lid tightly, the camera turns on, the lid is so tight that no tape can keep it pressed in its place.
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I was wondering if components needed to be attached to a metal housing. I was told that if the power supply was not grounded to the motherboard, my pc would release built up shock in a large electrical discharge. Thanks.
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Hey Forum! I haven't been active much in the past very long time, but maybe I should get back into that. Anyways, I have a spectacular situation going on with my phone. Before you go and try your best at Google-Fu, this seems very unrelated to the popular issue with the Moto G 2nd Generation, where the battery circuitry decides to let the battery discharge far below safe voltages for no good reason. So, my phone is a Moto G2 Second Generation, with the model number XT1072. It's been a good device (but slow), until now. When I plug my phone into any USB power source, it triggers some sort of protection. I believe it's gotta be short circuit protection, because I doubt that my phone would try to draw 2.4 amps with its broken charging circuitry. This is especially apparent with a Trust powered USB hub from a few years ago, which turns off its power LED when I plug the phone in, while if I plug in a 'healthy' device, it works fine. Now I'm lucky that I don't need to use the phone as I've got a Nexus 5 to replace it with. However, I did use the Adoptable Storage mode, with plenty of stuff on my SD card on there, meaning that I'm unable to access the data on any other device. Pair this with the fact that I don't have enough battery power to get everything copied across and no way of charging the device, and you have my interesting situation. So, should I try to disassemble the phone and externally charge the battery, somehow giving it the right voltage on the input and being careful not to blow it up? Should I try to remove the battery from the phone and find myself a 4v power source, then hope that I could wire it in and that it would be happy without additional stats that the battery would report? Should I try something else? Thanks, Tedster I'm sorry if this is in the wrong section, this seems the most appropriate.
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I'm planning on doing a PC mod soon, and one of the requests from the client is to include a functional car cigarette lighter (it will be for cigarette smoking, unfortunately...I tried to tell him it's a bad idea, but he's paying me to do it anyway). I'm a noob to electronics. I know I can wire a 10 amp ATC fuse in series with the +12VDC leg in series to the back of the lighter socket, but what if I wanted to prevent the lighter from ever drawing more than 9 amps? It will still work, albeit the lighter will heat up slower than it maybe wants to. I don't want the fuse to blow, only as a last resort. It will be very hard to get to, and I don't want the fuse to pop and melt other things in the process, or send shrapnel everywhere. I don't want to use a breaker because they're too slow, and only a few have a chrome dipswitch like P&B's (this is an aesthetic requirement). Interested to know how the circuit would look. I don't know how to calculate resistors or find parts, really. I need help. I just don't want this thing to start on fire or ruin itself.
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I have two computers running in my shared office space with a combined maximum power draw of about 700-800 watts under full load. I'd like to use an air conditioner in the same room. The one I have is rated for 450 watts which leaves 1800 - 750 - 450 = 600 watts left over. I'm not sure what else is on the circuit but I think both computers and the air conditioner wouldn't trip the breaker. Even if it won't trip the breaker, is it a good idea to have an AC unit on the same circuit as the computers? I know there will be a voltage drop when the AC unit starts, so is this likely to be problematic?
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So, I'm wanting to build a Sleeper PC. I've got parts figured out for the most part, but one thing that has me stumped is how to utilize the old style rocker switches from way back when as a power button. Of course they were the actual 'power' switches, but now it's just an electronic switch that signals the PC to boot up from a dormant state more or less. Basically I need a way to make a rocker switch into a temporary switch, so that it does not shut the PC off immediately after getting turned on. If this is possible, I'd really appreciate the help. Thanks!
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Hello folks, I have an oddly specific question. I need to know how motherboard power circuits work. I know that they can be shorting the two pins on the motherboard corresponding to power. My question is whether the motherboard is detecting the circuit being closed, or whether the motherboard is detecting a voltage/current through the negative end. The reason behind this question is that I am trying to create a wireless power button. I have two approaches in mind. If the motherboard is simply detecting a voltage/current through the negative end, I can simply send a current through to the line. If the motherboard is somehow detecting the closing of the circuit, then my other option is to have a physical solution with a servo or something to physically push a conductive plate to close the circuit. If anybody has any insight on this, it would be really helpful. Thank you.
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I want to power an amplifier using a battery pack I made from 2 battery x6 slot holders wired in series with a DC power cable coming off it into the amp. However I also want to be able to charge the battery pack whilst also powering the amp with the battery pack. What's the easiest/cheapest option to do this? I Know you can charge these battery packs I made I just don't know how Any ideas on how I would wire this?
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Can somebody explain why voltage doesn't affect mAh? If i have a phone, rated at whatever mAh and a battery back rated at let's say 10000 mAh, why does the amount of recharge cycles not depend on voltage at all? why can this battery bank supply 10000 milliamps of current at 1 volt and 10000 milliamps of current at 5v without it changing how long it lasts? (or maybe i have that wrong and somebody can explain what actually happens)
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Hey guys, Im doing a project where i want to make an led strip indicate the battery status on my phone through wireless charging. I'm making a base with a wireless transmitter integrated and i wanted a LED strip to go around the base and change colours with the level of power in the battery. Lets say red for <20 and green for >80. Is this possible?? Thanks a ton Prithvi
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If i have 4 5amp light bulbs connected to one relay, does the relay need to be able to support 20 amps, or just 5, or something else, and how would i calculate this myself using ohm's law in the future, Thanks
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Hello, I am currently in progress of making a circuit that has a relay in it. I was planning on the power of the circuit to be coming from the usb header on the motherboard since the motherboard I have supplies power to it when it is in the off state. With a switch, it would activate the relay in my circuit. I understand that the relay's reverse polarity can be harmful to other electronics in the circuit (in this case the motherboard) if not dealt with properly. I have a diode that handles that extra voltage from when the relay switches back to its default state. My question is: Even with the diode in place, will my motherboard still be at risk for damage with the relay? Right now I am using AC to DC 5V wall plug to power the circuit and I would like to move it onto my computer for my convenience. Note that it works fine with the wall plug and I have tested it. There is a transistor as well. Picture of circuit attached. What is the circuit that I have been talking about? It is a circuit with 2 flip switches and a key switch to turn on my computer. It was something fun with no practical purpose. I am using power instead of using the circuit to directly short the pins because the switches have LED's in them which I would like to have illuminated when flipping on (adds to the cool factor lol). This will be mounted on the top of my case. Picture also attached. If I didn't explain myself well enough, which is likely, I will be actively watching this post for 10 minutes after, and every now and again after. Edit: changed time frame that I will be looking at this
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Hi, I recently got a new rig and I've been experiencing difficulties when I turn PSU on. If I use the normal sockets in my room (10A), no other device can be on when I turn the PSU on or it'll result in a short circuit. I have been able to turn the rig on and then turn the other devices on. Today I tried to use the sockets in the kitchen which are 16A and there was no issue. So the question becomes: this can't really be about the fuse? My Nexus RX-8500 850W PSU can't really be that power hungry that 10A isn't enough? At the moment only CPU(i7 3770) and memories were attached. The PSU is brand new and it's the second one as I already had another brand new one (same model). The PSUs were ordered from different shops. And a bonus question which I'll ask from my landlord's technical maintenance: is is possible that there's something wrong with the whole electrical system? That seems unlikely as well because the building is 10 years old. All comments and help is welcome. Cheers
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Need Guidelines to becoming a electronic engineer!
HandsomeChow posted a topic in General Discussion
Hi, i am currently a student studying in the UK and still going through with my GCSEs I am planning to go to a American University for Electronic Engineering I need something unique about myself and stuff to do to prove that i am truly passionate about Electronic Engineering (E.g: The equivalent of writing scripts in CS but on a hardware circuitry level) I love building computers and i have built a few already in the past but building computers is easy and i need some advice on what should i do/build to show them who i really am? I have access to circuitry building materials and i need a student level project to work on. So i need some suggestions on what extra electronic computer/circuit building activity i should do? Thanks -
First Build! Question about larger cooling solutions
Whiskey_Tango_Foxtrot posted a topic in Cooling
Hey all! I'm almost ready to purchase my parts and put it all together, just have some last questions (these, and one more in Memory) I'm looking for a capable CPU cooler. I do not plan to overclock my system immediately, though I would like to have the option in the future. I am currently looking at Phantecs PH-TC14PE and Noctua NH-D14 as options, however I am worried about both products limiting the usability of the first PCI-E slot. I would like to be able to put my graphics card or sound card in that slot, however I'm worried about them making contact with the CPU cooler and shorting out. Would anyone be able to recommend an electrically nonconductive something-or-other I could put on the back of the PCI-E card to guard against a short? Would the backplate on the ASUS DCU II 780 work for this purpose? Should I even try using the first slot? It is not absolutely necessary for my built, though i would like to be able to keep it available for use if possible. System specs: http://pcpartpicker.com/p/2bBtJ -
i wanted to show off to my friend and overclock my cpu so im on cpu-z i5 760 15# top overclocks. in order to do that i put my pc in a fridge, and turn it on. it turns on for few seconds and then shuts off. after taking the components out of the fridge i notice water all over my motherboard and some on my graphic card. by then i was 99% sure that one or more of my components were dead. i dried out my mobo and gpu for about ~30 minutes and it still works! VIDEO (CLICKY) http://youtu.be/tkBRu43N-IA
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Hey guys, im thinking about tattoo. And because computers are kinda in my hearh i want something related to it. Already got few tattoos and i made this today and i want to ask you guys what do you think ? It is just a concept, I am going to change a lot probably. Cheers!
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