### Power Electronics: power converter Answered

I have been running through example questions for an exam I have coming up; the following picture is a condensed version of half a page of working. My lecturer gave us the solutions and a few steps between beginning and end to get to the solution so we could work it out. However, as you can see the picture below I got 30.6A whereas she wrote 54.2 down. The problem is to "Find the maximum values of the average" (done this bit) "and rms thyristor currents for any firing angle, alpha.". The values of R and Vs are in the diagram. Alpha is assumed to be 0 since then the thyristors will conduct for the greatest possible length of time. I think she may have got to the end then forgotten to square root of Pi before multiplying Vm/2PiR by it. Does anyone agree?

Question by Jayefuu   |  last reply

### Powering LEDS with mains power.

What if you made a voltage divider with high-value  resistors, and then rectify the signal?  Is that dangerous?

Topic by flagrantfouler   |  last reply

### Wind Power?

Rather than charge batteries, can an inverter be used to run the power from the turbine to the grid?

Question by Hubiewan   |  last reply

I need to make a 6.5 vdc - 500ma power supply I have no clue how to make it 6.5v. any help is deeply appreciated

Question by BluTiger   |  last reply

Would like some suggestions as to how to circulate hot air from wood stove in one room to other rooms in home, when the power is off We usually use Fans when we have power.

Question by emit   |  last reply

### Laptop Power

Hi all. I have a really old dell laptop(given to me) that is missing a power supply. It requires 20v and 3.5 amps to run. I want to make a digital picture frame out of it. I wont be using the battery or cd player and maybe not even the hard drive(not yet decided). Any idea's on what to use as a power source? I don't need to charge a battery just need power. Could I use an old pcu? I know that I could combine the two 12v lines to get 24 ish volts but won't that fry the old thing? I don't want to buy a replacement power adapter cause it is so old and may not work anyway(plus I wont lie I'm cheap lol). Any suggestions?

Topic by jmiller634   |  last reply

### Wireless Power

----- Click Here for Full Story -----We may be able to say goodbye to power cords in five years, as Intel has developed a system called WREL (wireless resonant energy link) that could possibly run electronics without having to find a wall socket."Wouldn't it be fantastic if we didn't think about where the power was coming from and the power was everywhere?"said by Intel boss Justin Rattner in an interview with BBC. Rattner explained that through Intel's idea of "magnetic induction", the power source can be tuned through a resonator, enabling gadgets to receive power wirelessly. The report further explains:"Power is put into magnetic fields at a transmitting resonator - basically an antenna. The receiving resonator is tuned to efficiently absorb energy from the magnetic field, whereas nearby objects do not."Of course, there would be issues at hand if Intel's technology breaks through the mainstream. How are companies such as Monster Cable going to fair if this new possibility rises? Well, we'll just have to see until then.Just how long till someone makes this cheap?

Topic by Keith-Kid   |  last reply

### Powering LEDs?

What I am trying to do is built a LED board that beats to music.  I have found many way to make it beat to the music, but my problem is I don't understand how to power the LEDs.  I am new to building electronics, and I am still learning.  Anyways, what my hope to do is use build a board 46in long running one LED per inch.  This will be dived up into smaller sections to run different beats off my home theater system.  I am trying to run all of this using  4 TIP31c, and I understand how to use them, I just am not sure how to power this.  Thank you!

Question by Togroovy4u   |  last reply

### Power problems

A friend of mine recently blew a fuse and now his desktop isn't working. Is there anything I can do to to help him so he doesn't have to get a new computer?

Topic by computerfaker3   |  last reply

### Capacitor Power

I want these so badly, and I live relatively close (about 300 miles away).http://cgi.ebay.com/Qty-46-Pulse-Capacitors-7000v-230uF_W0QQitemZ200268515465QQcmdZViewItem?hash=item200268515465&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14You can make one heck of a capacitor bank, releasing almost half a megawatt in a split second.My only problems:I don't have 1600 dollars, crycry.These things are so large that if I were to line them up side by side (so that the thinnest parts create the overall thickness) it would be 25 feet long, 14 inches wide, and almost a yard tall. THE POWER BOGGLES THE MINDI'm so mad, if I was an adult I'd buy these in a heart beat... sigh... deal of a life time... I hope not...and best of all, they are PULSE CAPACITORSthoughts? comments?

Topic by guyfrom7up   |  last reply

### Power of a ramrod

Hello guys, I'm working on a knex gun now, but I have a question about how to get the max. power out of a ramrod. So when does the ramrod give the most power: • 1: The ramrod hits the ammo and doesn't go further • 2: The ramrod hits the ammo and still goes (a couple of centimeters) further Thanks in advance, Bobbienator

Question by DELETED_Bobbienator   |  last reply

### Power supply

Last time I tried to do my own homemade project I failed utterly, I think mostly because I had no idea what anything was (if you saw my last topic on a distortion petal, you know what I'm talking about). I decided instead to buy a book (Tab Electronics Guide to Understanding Electricity and Electronics by G. Randy Slone) which has projects in it, the first one being a power supply. I haven't started building it yet (waiting until I get back to the city) but I've started looking up parts. The thing is, I can't find a 4400-uF 50-WVdc capacitor anywhere! So my question is, can I just put two 2200-uF 50-WVdc capacitors in parallel to do the job of one of the 4400's? That isn't my only question, just the first which I'll ask later in this thread. Thank you (PS: Has anyone had a problem with using Chrome and entering text into these fields? I had to switch to Firefox to get it to work)

Topic by gohuskies   |  last reply

### rectenna power

Im trying to find some practical build instructions or something to clarify how to do this in my own mind most of what ive found is not helpful any input would be apreciated im trying to build one for a ardrone

Topic by cwidner   |  last reply

### transformer power

I have been thinking about this for a long time now and in therory it works.  What im wordering is if you could make it work in place of the traditional power outlet.  Here it is, basicly there are just coils of wire inside of a transformer, on coil has say 240 turns of coil. Inside of this coil is another coil with 240 turns also.  So the voltige inside the first coil will be the same as the second coil.  And to half the voltige in the first coil.  If you had a plug that was just a cilender with a coil of wire inside and an outlet that was a hole in the wall with a coil inside.  I know a hole in the wall with 120 volts running through it sounds scary , but put a plastic cylinder inside the hole and vurtaly no shock hazerd. sorry for the spelling errors spell check was not working.

Topic by Laserman595   |  last reply

### DC power + or -? Answered

I have looked at lots of Instructables and websites, but there is a 50/50 split that power flows positive to negative and negative to positive. Which is it? I use both, depending on the circuit I am building it is easier to build one way over the other (NPN and PNP Transistors usually) But I have heard that it used to be thought that positive flowed to negative but I have since heard that the new idea is that it flows negative to positive. I know that everything is supposed to flow from higher concentration (+) to lower (-) but we could have batteries labeled wrong so I don't know. Very confused.

Question by Electric Spectre1   |  last reply

### The power of the mind...

I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it dseno't mtaetr in waht oerdr the ltteres in a wrod are, the olny iproamtnt tihng is taht the frsit and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it whotuit a pboerlm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. Azanmig huh? yaeh and I awlyas tghuhot slpeling was ipomnartt! Can you understand this? Does it make any sense? I know I could read it. Can YOU? NOTE: Yes, this is more legible than certain Instructables and forum topics are. Irony?

Topic by whatsisface   |  last reply

I have a 1.2 V nimh battery and a 3.7V li ion (no protection circuitry) battery, which would add up to 4.9V if put in series. However, I want to turn it into a temporary USB power supply (5V) so ignoring all the things regarding putting 2 batteries of different capacities together, is there a way to kick the voltage up a tiny bit? I was thinking something like filtering the output of a joule thief, possibly. I also have a solar panel (4.5V, ???A) and was wondering if that could help, but I don't want to rely on it too much.

Question by .Unknown.   |  last reply

### Wireless Power?

OK so recently I have noticed that almost any sort of power can be converted into a different type, sorta. Anyways, it takes power to create radio waves or any wireless wave. Would it be possible to just send out plain radio waves and get something to pick them up and convert them into usable power? Now I know the farther you were from the source, the weaker the power would get, so you might have too send out a fair voltage signal to get some good range. Also, would it interrupt any electronics in range or anything like that? I was just thinking about this and wondering if it is even possible to get actual wireless power around your house or something without using batteries or interrupting anything in your house. Thanks.

Question by noobererer   |  last reply

### solar power?

I want to get these 12v solar battery chargers they come with alligator clamps to hook to the battery. i want to get enough for 200 volts so how would i hook the solar panels in series, and do i need a controller for each battery? and how would i rig that up and how can I get it going into all the 12 volt batteries without any damage to the batteries etc. And can this be done for less than \$400 if the solar panels are \$30 each and the batteries are \$14 each. THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!! oh and could you give me links for all the stuff I'm gonna be buying. THANKS!!!!

Question by jimmerforpoy   |  last reply

### POWER TOOLS

I was just wondering what are good places to buy power tools from, thanks.

Topic by TREX ZoaR0K   |  last reply

### isnt powering on?

Have replaced a ds shell, but the power button dosnt work it feels as if it should have grip of something as it feels to free,?

Question by rodelesk   |  last reply

Does anyone know the average power impute on a LCD display i need to test its backlight

Question by MACKattacksnipe   |  last reply

### Power Suit

Lets make a power suit: some one please make a website and make me the leader and we could make this power suit to make our future better. send email to me when you make it scarygyujosh@gmail.com no spam please!!, maker the site name powersuit.net

Topic by scaryguyjosh   |  last reply

### power hack

Aside from it being an ugly hack, is there any reason I can't strip the wire back from the end of a printer power cable and solder it to the plug terminals of a 5v wall wart transformer? This shouldn't be a fire hazard since the power cord should be rated correctly, correct?

Topic by randofo   |  last reply

### power saw ?

My brand new Ryobi Power Saw just busted. I turned it on with the wood in so the saw blade was stuck. Pretty soon the motor just stopped and won't even make a sound . It's shot. But what exactly is shot? Can I replace a part?

Question by

### powered speakers

Hello im realy new to the electronics game and i was wondering if anywas can sow me a REALY SIMPLE diagram of where wires should go to get powered speakers i have 2 speakers and want to power them by battery so a nice little circuet diagram would help:)

Topic by wii maniac   |  last reply

### Power supply?

Since I was thinking of building a bipolar power supply +12V, -12V, using a 12-0-12 transformer and using only diodes and capacitors, which I have successfully built. My problem is how safe can this power supply be? since I am not using any regulators?

Question by VAustin89   |  last reply

### Battery power

I have a battery powered laser on top of a spinning disc. This laser runs out of battery fairly quickly, I need to make it last longer somehow. Could I wire the laser to multiple batteries to make it last longer? If i manage to find a mains powered laser then it spinning constantly wouldn't work as it would have a wire. I ideally need to find a way to power this laser (probably 2 lasers) for most of a day with something that fits on a fairly small spinning disc. Any ideas? Cheers

Topic by happysnail   |  last reply

### Power Supply

With this circuit, does it matter how many amps the input is rated at? The output is supposed to be 2 amps at 9 volts

Topic by TheLostAmish   |  last reply

I need to get 36volts for something in my boat. How can this be done? Cant fit anymore battires. Easiest way to stepup 12volts to 36 volts.

Question by kurt1968   |  last reply

### iPod Power ... BUT!

Here's the challenge:I have a Belkin SportCommand iPod Remote and it works great. However, it uses the iPod's connector port and draws its power from the the player. I have this thing installed on a waterproof boombox that needs to play tunes for 8-10 hours at a given time and I don't want to have to open the box AT ALL (lots of water + electronics ...).So, I need a way to have both the iPod accessory plugged in and, at the same time, charge the iPod from a 12v power source (like most car stereo iPod adapters do. I think this is as easy as a little plug to go inbetween the iPod and the accessory, but I can't figure out which pins to tap into. There are a lot of different power pins on the connector, and I need to know which two (ground and V+) are the *charging* inputs.Ideas/suggestions/comments? Thank you!

Topic by tridens

### CD's for power?

I was cleaning my room and found a load of blank CD's. It made me think of all the AOL discs that my house used to get. So I got to thinking - There's a lot of power wasted on these things, right? So, my job for you, Instructables users, is to help me engineer a way to use these CD's to generate solar, wind, tidal, geothermal energy, whatever. Anything renewable. Any ideas?

Topic by A good name   |  last reply

### The power of C.A.D.

This is what happens when I get my hands on C.A.D!!!! And this is a pic of the RC plane I am in the works of designing. I dont have the ratios to make everything the proper size so I had to estimate. I plan on having it done by the end of my school year in September.

Topic by Pat Sowers   |  last reply

### Battery power

I am attempting to calculate my amp need for my garage in order to set up a 12v battery system. Using the formula; Watts / voltage = amps drawn, I have hit a question. If using a 12v battery system and converting to 110v, should I be using 12v or 110v in the formula?Example; 100 watt light bulb / 110 volts = .91 amps. Nice!But if I use the 12v; 100watt light / 12v = 8.3 amps.I'm believing I would be drawing 8.3 amps from the battery to power this light.Plus the converter draw...Please tell me which is correct?

Topic by olddawg   |  last reply

### Latino Power

Abro este foro en celebracion de la inclución de los nuevos países de habla española como admitidos para poder participar de los concursos y retos. Sientanse libres de compartir sus proyectos en español . Recordemos que somos ciudadanos del mundo. Hagamos sentir la magia y creatividad del Poder Latino ! Take that Mr. T. https://www.instructables.com/id/Walnut-SeasonTemporada-de-Nueces/ https://www.instructables.com/id/SAWDUSTOVEN/ https://www.instructables.com/id/HAWKEYE/ https://www.instructables.com/id/DIY-Hobbitss-Pipe/ https://www.instructables.com/id/Black-Walnut-Seed-Ring/

Topic by Mr.Sanchez

### Human Powered Bike Powered Generator?

HI, I am an artist and I am creating a bike powered led sculpture for kids at a museum. I need some help making the connections correctly and finding the correct electric motor and volts not to over load the LED light bulbs as well as how to figure out the easiest gear ratio for kids to turn, There will be five 60 Watt  /120 Volt LED bulbs connected to deep cycle car battery (used as a voltage regulator) that will be connected to a stationary bike pedaled by visitors to display the human energy potential. I want to figure out what type of electric motor I will need for those lights and how to make the gear ratio for the bike easy enough to turn for kids... Any knowledge on these calculations will help. Thank you ! Jessie

Question by real_jessie   |  last reply

### power wheels too much power?

So here da ting. i got a little 6v power wheels quad at a yard sale for dirt cheap. i figured hey why not ill work on it a little and make it nice. long story short, i ended up with two 18v harbor freight batteries hanging on each back fender like military ammo cans and it looks awesome but now its a little too scary to let my son ride it. i would like to put a voltage regulator on it to turn it up or down depending on how well he can ride it and how safe i feel he can be. most of the ones i have found can barely handle 2 amps. where can i get a regulator to handle the load continuously. p.s. this is the last part i have to figure out before i can make a full instructable.

Question by snowfox222   |  last reply

### Redirecting power to evade a power trip.

Summer days can be a bit too much in Southern California and my family uses a lot of electricity to keep the house cool. The problem is that one side of the breaker for the house is too heavy to handle all the appliances and electronics; because of it, the power trips a lot since people in my house apparently don't understand the whole "turn something off before you turn something on" concept. I considered running extension cords throughout the house but not only is it not practical but it can be a bit dangerous with the build up of friction from the ohms and what have you. I've been trying to think of ways to solve this issue and I was thinking maybe I could install a sensor switch or something of the sort that would not allow the use of certain appliances while others were on or maybe something that would turn something else off automatically in order for something else to be used. My biggest problem is I'm no graduate or electrician. I know a thing or two about the sort and am very capable of learning, I just need someone to point me in the right direction. I may not even be thinking in the right area which is why I'm posting. Any information would be greatly appreciated.

Topic by BnKSeth   |  last reply

### Higher powered speakers with lower powered amp or Low powered speakers with higher power amp?

There is a lot of conflicting information on this and I would like to know if my speakers/amp would get damaged. Using 80w speakers and a 50w amp will there be any problems with running on full volume? And if I got a 100w amp with those 80w speakers will there be damage, even if I added a heat sink to the back where the voice coil is? The speakers say 80w max but not really reliable as they are well priced Chinese speakers. Speakers: 80W Audio Sensitivity: 88dB Frequency Range (Hz): 100-20Khz 4 Ohm Amp: Efficiency: 90% Rated output power: 2*50W+100W Working voltage: DC18V to DC24V The maximum output current: 4A Frequency Response: 20Hz-20KHz Can drive a 3-16 ohm speakers In the condition of rated voltage 24V The sub woofer channel at rated voltage 24V state can drive 2-16 ohm sub woofer Bass cut-off frequency independent regulation 20HZ-20KHZ adjustable Very confusing conflicting info online with under rated amps causing clipping and over powered amps frying the speakers. Originally I thought it was only bad to over power the speakers. Any help about what is worse, is appreciated.

Question by bonze77   |  last reply

### PC Power Supply To Power CB Radio?

I have a cb radio my uncle gave me 12v 2-4 amps.. I have an old computer with a power supply with lines for 12v 6amps and 12v 8amps. is there anyway I can get this to power my cb radio without blowing the thing? EDIT I forgot to mention, this is a mobile cb radio, I'm trying to run it in the house, which is why I wan't to use a pc power supply to run it....

Topic by acer5050   |  last reply

### How to power a High power laser diode?

If I build a 42A Constant Current PSU which can supply 1.2-6v, will the laser diode only draw 1.8-2V or will it try to draw to much voltage and damage its self? I have a 40W CCP CW Laser diode, here are some characteristics. Operating Voltage (V) <2.0 (1.8 typ.) Operating Current (A) <46 (42 typ.) I know that laser diodes will try to draw as much current as possible and suffer thermal runaway, so they need constant current power supply's. If anyone has any information on how to power high power laser diodes please let me know. All help will be greatly appreciated!

Question by deltawars   |  last reply

### how to power a 30w high power led? Answered

i am making a diy homemade projector and i want to know how to power a 30w led without a driver becouse the driver cost 30\$ and i want to make the projector as cheap as posible so if anyone know a way to power a 30w led without a driver please help me the led ......http://cgi.ebay.com/30W-White-High-Power-2100LM-LED-Light-Lamp-Bulb-A_W0QQitemZ220708010099QQcategoryZ163866QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D10%26pmod%3D220693236934%26ps%3D63%26clkid%3D5621333683761900258

Question by Andrew_48   |  last reply

### Substitute of Power Transistor

What is the substitute of 2N6292 power transistor? Please suggest a good substitute of 2N6292.It must be an NPN power transistor. Thank you.

Question by SiamB1   |  last reply

### LED power supply?

I need some insight on powering 2 separate circuits. Here's what I have so far...... Circuit #1.   80 3.3v  leds consuming 400MA. Circuit #2.   20 2.0v leds consuming 60MA. Now my power supply output is 15v - 600ma, will this power supply suffice wired parallel? I do have a 9v-1a power supply too that could power circuit #2 if need be. but for simplicity of things i would like to use one power supply.

Question by ARGMISTER   |  last reply

### PSU Power Supply

I built a PSU bench power supply, but it isnt outputing the right voltages. It just out 5v for all lines(12v,5v). It has a purple wire that is said to be the stand-by, but the psu wont start unless it is connected to the 12v or 5v line. It also says that you have to have the brown sense wire attached to the 3v wire but this seems to do nothing. How can I make this thing output the right power(12v @ 22A, 5v @ 50A)?

Topic by tylerb   |  last reply

### Making a power supply.

Hi. I have an amplifier. It needs a 12v-0-12v transformer. I have two 12v adapters. Can i attach these two adapters like this(shown in image) to get 12v-0-12v???

Topic by Shezi007   |  last reply

### Power supply help?

Hi- i have an ION electronic drum kit that i got from a friend, but i somehow managed to lose the power brick. It wants 9V AC & 850mA, which for the life of me i cannot find anywhere. So, does anyone know where i can find one, or if there is something else that might work? Thanks a lot.

Topic by Samster1214   |  last reply

### OEM Power Supply

I have an unregulated power supply, with a bridge rectifier. I suspect that the rectifier is damaged. I measured the components and the voltage on the rectifier, every connection past that measures 0 volts. Shall I replace the 4 diodes?

Topic by knektek   |  last reply