DC to DC converter

Hi ppl, for electronics A level coursework i am hoping to build a DC to Dc converter to use to power high power leds. As far as i understand it will convert DC to AC, use PWM to alter the current out, and then convert this back to DC giving a constant current out. These are available in devices (known as buckpucks) but for my coursework i hope to build a similar thing on Breadboard. This is really a question for the engineers and if they could give me some advice on anything to do with this it would be great! Thanks ppl

Topic by drummer ian 11 years ago  |  last reply 8 years ago


will12 volt dc appliance work with 19 volt dc supply

I'm wondering if I can run a 12 volt DC thermoelectric cooler with a 19 volt power supply from an old laptop

Question by seadog301 2 years ago  |  last reply 2 years ago


Thermoelectric plates not working?

Hi, I am doing a school project and i need to power 8 LEDs with 10 thermoelectric plates, so i soldered 2 on one led and put them over a candle, the LED didn't light up and i don't know why. Is the voltage too low? If so will i be able to power 8 LEDs with ten of these in parallel?  Thanks for any help in advance!

Topic by CrazyPharaoh. 2 years ago  |  last reply 2 years ago


Universal DC to DC adapter?

Does anyone know where to purchase a universal DC to DC adapter? I'm trying to run a webcam off of a specific amount of electricity from a battery pack. 

Topic by DarrenG 8 years ago  |  last reply 8 years ago


Thermoelectric <Peltier> coolers

I would like to know if anyone out there in Instructables Land knows about Thermoelectric Peltier Devices- what they do and how they work. I have 3 of them in my collection of various electronic components & devices. I consider myself as having a good knowledge of thermoelectric peltier devices. If anyone out there thinks they know more than I do, OR works at a place that manufactures them, please let me know at labrath4@yahoo.com I'm currently unemployed, and would like to work at a place that manufactures peltier components- preferably in the testing and engineering department.

Topic by PeltierMan 9 years ago  |  last reply 2 years ago


dc inductor

Do inductors work with pulsed dc? like would they become more resistive with frequency? Or would they do nothing because it's not ac and the electrons can't "bump" into eachother.

Topic by guyfrom7up 11 years ago  |  last reply 11 years ago


Thermoelectric cooler/module

I'm working on a project with peltier coolers. I want to get it as cold as I can. What would be my optimum power source? Amps over volts? If it helps I am planning to hardwire the device. and I'll have plenty of room for mounting fans on the hot sides heatsink Here are the specs 50mm x 50mm x 3.64mm 245 - 320 Watts of cooling power Operates from 0-15 volts DC and 0-26 amps Operates from -60 deg C to +180 deg C Thanks

Topic by curve12 11 years ago  |  last reply 11 years ago




12V DC to 12V AC? Answered

I have a speaker with an embeded amplifier that uses 12VAC ~ 2.9A and want to connect to a 12VDC in my car, a simple bridge rectifier will do the trick converting the corrent? 

Question by Salazar2 1 year ago  |  last reply 4 months ago


Converting 12v DC to 5v DC

Greetings, I’m very new in electronics. I would like to connect my analog camera that uses 5v dc to my car battery. So I need your help to make a voltage converter. From what I have understand searching the web, I will be possible and very easy actually. All I would need is an opamp and some resistors?!!! Right? So any diagram or anything that you can help me with will be more than appreciated. Thank you for your time reading this. Best Regards P.S. I hope I’m in the right place writing this topic  

Topic by toqilula 8 years ago  |  last reply 7 years ago


convert 5v DC to 3.3v DC?

Hello would somebody help me with this please, I am not much of a "electronic" kind of guy so this is a big problem for me. I lost the power adapter of our office router WRT54GC (linksys) and my boss has his finger cross on me. I only knew of its power which is 3.3volts 2A DC. From my location, it is very unlikely to obtain a replacement or an equivalent adapter. I have salvaged a power supply of and old printer that gives off 5.0V 2A DC but the router would not run with this voltage. I will really appreaciate it if somebody would be able to help with a step by step explaination on how to lower the 5v to 3.3V . Thank you very much.

Topic by gincasty 9 years ago  |  last reply 9 years ago


how to reduce 5v dc to 2.5v dc?

I need to reduce a 5v power supply to 2,5 v for a certain application, I've got a converter that can do it, but want to do it using some electronics any ideas?

Question by fjchorn 7 years ago  |  last reply 1 year ago


converting low voltage AC to DC to power LED ?

I have a circuit that is 5.5v AC used to power old incandescent power on light , I want to convert to DC and use an LED ...do I need to build a bridge rectifier for this ?what will 5.5V ac convert to in DC ?thanks?

Question by bernard991 10 years ago  |  last reply 8 years ago


Can you use 110 AC components with DC? Answered

Question by master key 10 years ago  |  last reply 10 years ago


wireless electronic device

I am looking to build a device that can communicate with a phone and through that phone you could turn on or off a light or a siren with fairly long range 20 to 30 meters (60 to 90 feet). Would anyone be able to help regarding this device. I am looking for it be as small as possible. also i wanted this device to run with fairly low voltage dc power source. please help with this  thanks

Topic by sam501 6 years ago  |  last reply 6 years ago


24 Volt AC volt to 12 volt dc?

Hi guys i have a 24volt ac motor and want to reduce it to 12v dc. I have worked out how to change it to dc but not how to reduce the voltage. Is this easy to do or do i need to purchase something from the electronics store. any advice would be appreciated sam301

Question by sam301 6 years ago  |  last reply 6 years ago


Is this a way to step down DC Voltage? Answered

If i have a 12 volt supply, and would like a 9 volt supply, would there be any problems with connecting a 3 volt battery backwards to cancle out 3 of the volts leaving me with 9?If that is possible, will the battery be run down. image to explain. http://img7.imageshack.us/img7/407/testcircuit.jpg?

Question by evildoctorbluetooth 9 years ago  |  last reply 6 years ago


i want to make a 6v ac-dc adapter

I want to make a ac to dc converter which will give an output of 6v under the input of 220v to 240v. if it is possible please help me with the circuit diagram as well as the list of parts required for the project. it will be a great favor to me.

Question by gdg1234 7 years ago  |  last reply 7 years ago


What is the best way to to turn 24 volts dc into 14.4 volts dc?

I want to make a power supply for my laptop so I can use it for long time while camping.  I want to use car batteries.  I have tried using just one car battery but this does not work.  A car battery varies between 12.6 volts and 0 volts.  Most of the energy is gone by the time it gets to 10.5 volts.  An inverter is designed to be used when a car is running.  The alternator generates 14.4 volts so things which run off of a car alternators operate at 14.4 volts.  When I plug my laptop into an inverter which is connected to a car battery sans the car it will only work for a few minutes.  The voltage of the battery drops when current is being drawn from the battery.  This sets off a low voltage alarm on my inverter.   So new plan is to hook up two car batteries in series running at 24 volts.  This brings me to my question.  What is the best way to convert the battery power to a regulated 14.4 volts.  The battery will be 25.2 volts fully charged and will drop all the way to zero when dead if you let it.  Most of the energy would be gone by the time the battery gets 20 volts.   The set up will be 24 volt batteries---14.4 volt regulator---inverter---laptop

Question by Noblenutria 1 year ago  |  last reply 1 year ago


Covert 12v dc to 15v and 3v?

Hi guys, I need to convert to 15vdc and 3vdc from a 12vdc source... any ideas? Efficiency isn't the biggest concern, but size and simplicity really come into play. i promise credit if it becomes an instructable.

Topic by gschoppe 10 years ago  |  last reply 10 years ago


DC MOTOR CONTROLLER

RELATED TO DC MOTOR CONTROLLER (EV VEHICLES) 1: Need for large number of capacitors in the power circuit (store the charge and dissipate to which part of the component mosfet or diodes ??) ? 2: what are diodes parallel to the mosfets for ? ( other than preventing the back emf coming from the motor ) and is it have anything to do with firing angle ? 3:advantage of using many mosfets in parallel than using a single mosfet and on what basis must that mosfet chosen? I am from India a college student pursuing my electronics engineering and making motor controller,i am able to get all the circuit details and how the motor controller works but i have above few doubts

Topic by doraditya 5 years ago  |  last reply 5 years ago



Help wth a 12v DC circuit

Hello all2 Questions pleaseI am working on a hobby project and I am needing to hook a 12v computer fan (200mm) which is 0.3A max...up to a Turnigy 5.0 Li-Po battery. The battery is 7.4v, 30-40c discharge, 5000mAh. I have ordered a DC to DC adjustable voltage "step-up" converter to increase the output to 12v (I am hoping this works). (Q1) - how (if at all) do I limit the output amperage to 0.3A without burning up the fan motor.The fan is going into a cosplay set of foam armor (to help keep some air flow going to try to keep semi-cool) and I am hoping to be able to run the fan for about 3hrs. If I can accomplish the above, (Q2) - how long might the fan run?Attached is the "step-up" I ordered...

Question by Jeepguy001 4 months ago  |  last reply 4 months ago


How can i power this unidentifiable motor? Answered

I have a motor that has no markings on it outside except for the letters DMEGC, which I understand to be a Chinese company that produces motor housings among other things. I think that it came off of an electric scooter, but I'm not even sure about that. The person who gave it to me only knew that it was a DC motor from somwhere. It's about three inches deep and the diameter is probably about 4".  It has two wires coming out of it. My question is: What should I use to power this thing? I don't want to waste a bunch of money on it. How risky is it to just test out AC-DC adapters on it? I've got a plug here I wouldn't mind wasting if it will work that outputs 12VDC 500mA. Sorry, I'm a real beginner with electronics and I'm probably asking really dumb questions, but if someone could help me out, I'd be really grateful.

Question by jemtan990 5 years ago  |  last reply 5 years ago


Can someone explain what all these connections on this transformer are for? Answered

I pulled this transformer out of a complex circuit I found in the electronics recycling box. It says it's a "TurboLink Switching Power Supply" but I have no idea what that is either. Perhaps someone could explain that too? Anyways, I want to see if I can possibly use this transformer in a DC circuit to increase the voltage, but it would help if someone could explain which wires are connected to the primary and secondary windings! Also it would be nice if someone told me if it's even possible to increase the voltage in a dc circuit. For example, is there a way I can connect this transformer to a battery so that it converts 1.5v to something higher? If you look at the picture, I think the 6 connections poking out just under the yellow part are all connected to the two wires coming out at the top beside my index finger. Then there are two leads and the bottom. Anybody know what they do? I connected one end of a 1.5v battery to one of the leads at the bottom and when I rub the other end of the battery on the other lead it produces small sparks.

Question by Ke-Bob 8 years ago  |  last reply 8 years ago


simple power supply

I have a project that needs a 24VDC input, at only about 300 mA. I don't have any 24V power supplies, wall warts or anything else lying around, but what I do have is a 120 in, 24 out transformer, a bridge rectifier, and a large cap. Is there any reason why I shouldn't just use those? I'll put a fuse on it. I have some 317 voltage regulators but they dissipate too much to provide the full 24V. 317s are short-protected and the like, which obviously my little kludge wouldn't be, but beyond that, is it a bad idea? thanks,

Topic by deadbilly 10 years ago  |  last reply 10 years ago


electronics circuit designing question? Answered

So i am pretty good in electronics, im curently modifing a circuit and just found the value of the resistors with the ohms law. i have to lower from 12volts dc to 3.5 volts dc to a 300mA consuming high powered led with the cathode to the ground. if my calculations are right i would need to use a 30 ohm 3w resistor, should i take a 4w so the heat is not too intense? the led is not going to be light up always, its going to oscillate on music(color organ). are my calculation right?

Question by pbergeronronronron 7 years ago  |  last reply 7 years ago


How to pulse dc current? Answered

Hi! I was just wondering if people could give me some different ways to pulse dc current. I am trying to power a transformer with dc. Thank you in advanced.

Question by tesla man 6 years ago  |  last reply 3 years ago


Electronics for power supplies

First, I apologize for being (almost) the hardware version of a "script-kiddie". I do want to learn the techniques involved but all of the electronics courses I've found work the wrong way around. They teach "this is what we have and this is what you can do with it" whereas my brain works in the "This is the problem, here is a solution and this is why it works." manner. This is how I learned software but when you get it wrong you can start again without losing the magic smoke! I have a 250ah, 12V battery bank, multiple DC devices requiring power and, eventually, several power sources for recharging. I also have several MC34063 chips and a few higher amp chips (somewhat optimistically as it turns out). Firstly, is there a practical course online that is built around this? Secondly (and probably extremely basic), if a device draws, for example, 3A is it self-limiting or do I need to put something between the source and the device too restrict the power?

Topic by ImmortalSoFar 8 years ago  |  last reply 8 years ago


18volt dc tile saw

I have an extra DeWalt 18 volt DC saw. I want to know how it would work if I wired it to a 12volt auto battery charger directly. I want to use it to make a slow speed saw, with a diamond saw to cut large pieces of glass. If my ideea works I'll submit it for an instructable project. As you can tell I am electronically chalanged, but I an in theropy for it(electronics for dummies] Thanks for any input jrags

Topic by jrags 11 years ago  |  last reply 11 years ago


Slow down a DC motor?

Here is another basic electronics question for all of you: What is the easiest way to slow down the RPM of a small DC motor? Much appreciated!

Question by brandegor 9 years ago  |  last reply 3 years ago


how do i connect DC devices to my DC generator?

I got an old treadmill with a blown board, stripped out all the electronics ( kept it) with the intention of using the treadmill as a generator only - knowing that the engines are good - the engine is rated to 180VDC, and i have so far at a nice easy walk noted 100VDC on my multimeter hooked directly up to the terminals. it seems clear to me when i plug my 24v fan in and walk that while it spins well and faster the faster i walk - it doesnt need 100vdc and will probably blow eventually - so i must need a voltage regulator?>> or the like.... 1.) how to make / buy one easily? 2.) can i charge car battery from it - do i need any kind of regulation/ charge controller  if i was doing that - am i correct in believing the more load i wire in ( perhaps on a sliding scale or some kind of switch) the more resistance will be generated to the walker? thanks - will

Question by agatornz 6 years ago  |  last reply 6 years ago


Any issues connecting USB port /- and a DC 2.1 MM port /- together into a single DC 2.1?

Could I connect a USB port  +/- and a DC 2.1 MM port +/- together into a single DC 2.1 Barrel and connect it to a portable router without any damage? I want to hide my hacking router into a external hdd case and have a USB port/DC Port for different options to draw power into the router. Or maybe I should have a switch that enables either the USB port  | OFF|   DC Port? If anyone can help with this? Thanks...?

Question by mrstuky 7 years ago  |  last reply 7 years ago


DC Motor Burning Issues? Answered

I connected 6 Volt 4.5 AH Battery to a motor directly and that burning electronic smell came. Should i limit the current? If so, Then how?

Question by yhdesai 3 years ago  |  last reply 3 years ago


How can I disassemble a dc brushless fan without breaking it? Answered

I've got a couple old fans from computer power supplies. I'm removing the plastic fan to get at the motor. The plastic casings have different designs, but the core seems to be the same. I remove the sticker and pop off this little plastic cover. I'm expecting to see some sort of bolt or screw holding the pieces together, but instead there looks to be some sort of metal rod with a white o-ring. I'm assuming that's the sleeve bearing, but I have no idea how to remove the plastic fan; other then pry it off or dremel. Any ideas?

Question by Vorenus 8 years ago  |  last reply 3 years ago


DIY 9V DC to 110V AC inverter, and/or 9V DC to 19V DC transformer?

Hi, I want to build a 9V/110V DC/AC inverter, so I can power up things like my laptop with a car lighter socket. It would be always nice to be able to use electronics in the car when I'm traveling... What kind of components will I need and how would the schematic looks like? If DC/AC is a hard task, how would I go about building a 9V/19V DC/DC transformer so I can at least power up my laptop on the go?

Question by ddolbi1 7 years ago  |  last reply 3 years ago


How can I reduce AC ripple current in a power supply? Answered

Hello. I have a 40 amp, full wave bridge rectifier DC power supply that I would like use for radio equipment. At the moment this is not possible because there is too much AC ripple on the DC side. I know that using some form of capacitor you can make a conditioner, but I am not technical enough to know what capacitor to use. Basically I'm asking what I need to do to cut the AC ripple. Thank you very much :) 

Question by ckgarside 4 years ago  |  last reply 4 years ago


Making a wireless fountain for the backyard??

I am not trying to be babied or anything just need just basic advice. I picked up a few books on hobby electronics and want to get into it. For the first project that is not a "book" project I want to know how to use a small DC water pump to power a backyard fountain. In an Ideal world the pump would work from 100m+ away but this might not be a reasonable request. I purchased a pump and this is it:http://www.ebay.com/itm/Ultra-quiet-DC12V-Mini-Brushless-Motor-Submersible-Water-Pump-3M-240L-H-New-KN-/221703041910?pt=LH_DefaultDomain_0&hash;=item339e87f376[1] Very simple. I want to plug and play into a transmitter and a receiver. http://www.ebay.com/itm/DC-12v-10A-relay-2CH-wireless-RF-Remote-Control-Switch-Transmitter-Receiver-/171743350808?pt=LH_DefaultDomain_0&hash;=item27fcb39018[2] Will this system work? The way I understand it I need to connect a 9 volt battery to the receiver and I am assuming its soldered in. Then I can run wire to the motor directly. Am I missing anything here - I know this is very amateur but I am never done electronics stuff before. I will be taking a few community classes in the summer which could prove interesting. What else do I need to do this? Is there a plug and play system (receiver / transmitter) that would work easily?

Question by scottzkee 4 years ago  |  last reply 4 years ago


Question on using a Peltier/TEC device for air temperature control - Help please.

I want to have some control over the temperature inside the Orchidium I'm designing and I thought it might be cool :) to use a Peltier Device (device aka module) (Peltier aka TEC or Thermoelectric Cooler). I find I need a lot of help! (Please!) Alright, this isn't a completed Instructable, it's a plea for help, and maybe if the subjects lie in some of your fields of knowledge then we can all enjoy and learn from it. So, the Orchidium I'm designing is an acrylic case 24"W x 18"D x 30"High. It's to grow species orchids indoors in a microclimate, with LED grow lights, proper humidity, air movement and temperature control. (Of course, other critters would like the case, too: poison dart frogs, newts, carniverous plants, etc.. But I'm going to call it the Orchidium.) I've got it all pretty well planned out so that it can be built for a very reasonable price (yes, including the LEDs) and still be aesthetically pleasing and real purdy, too. All planned out EXCEPT FOR THE TEMPERATURE CONTROL. I was looking for some way to cool my case and I stumbled across Peltier devices in eBay. They are CHEAP, costing about $5 or more, depending on the Wattage, etc. The eBay sellers intimated that all you have to do is plug them in and the device gets ice cold. Later, with diligent web-study I learned that actually ONE SIDE of the peltier gets cold, while the other side gets hot. Also, you MUST attach a heat sink and fan to both (?) sides of the peltier. Also, that these devices are not ready to be plugged in; you must attach a DC power supply to them. Oh, another trick that these miraculous devices do is reverse their hot & cold sides when you reverse the polarity of their juice. Ideally, I would like a Peltier device with heatsinks, fans, a thermostat and a DC wall transformer attached... the Peltier/heatsinks/fans would measure about 2" x 2" x 6" and would be mounted in the sidewall of the Orchidium. When the temperature is 65-85F degrees the orchids are happy and the device is Off. But when the thermostat senses the internal temp going over 85F it turns on the Peltier, cold side inside, and so the inside of the case doesn't go up to 90-95F like mine does now; it cools the case a little. Conversely, for someone with chilly orchids or sneezing newts the thermostat would switch the Peltier to hot-side-in to heat the Orchidium a bit. The retail cost for us to buy a Peltier device, 2 heatsinks w/fans and a DC transformer is cheap... roughly $30. The thermostat might be cheap, but I don't know enough about what's needed. If it's too expensive then the Orchidium can do without it. I was hoping I could find an off-the-shelf Orchidium cooler/heater. No such luck. These miraculous Peltier devices are still practically undiscovered -- relatively speaking. People want to use them to cool their computer chips but are hampered by condensation; my orchids welcome condensation. Pathetically, it seems the most common use for Peltiers now is to cool/heat the little boxes on your car seat... they plug into your cigarette lighter and keep your 6-pack cold. Come on! You folks at Instructables can surely help me figure out how to best make an Orchidium cooler with this barely-discovered and poorly-utilized device. I started out a few weeks ago writing to many of the Peltier manufacturers around the world in hopes they might help me in choosing which of their modules I might purchase for my Orchidium. None of them was any help. They wanted to know how many million Orchidiums I planned per year. They told me my basic plan was hopeless or inefficient cost-wise. A Swedish company wanted $800. An American company wanted $500. Some other company wanted $5,000 to $8,000. I wrote back and said I could get a Peltier on eBay for five bucks. The Swedes snottily claimed that their Peltiers were very high quality. No. No way is any svensker Peltier $795 better than ANY other Peltier in the known universe. They both get cold and grow ice crystals on one side. I just need to cool the case A LITTLE BIT, like from 90 to 80 degrees Fahrenheit. I am not trying to make a refrigerator or freezer. The case (Orchidium) is large, at about 7.5 cubic feet, and there is practically no insulation. Acrylic provides a little insulation, that's all. The temp of the interior of the case is derived from the ambient room temperature of your house... and the lights... which is why I designed it with LEDs. There is a constantly-operating muffin fan inside the case to provide air movement for the plants, but it does not provide any evaporative cooling since it's a closed case. So, first off what size Peltier do you recommend... do you think a 40 Watt would be enough, or what? Next, the placement. I envision the Peltier device mounted vertically through a hole in the side of the case. It might be a plan to mount it in the ceiling, but remember that the LEDs take up most of the ceiling. Next, the heatsinks. I confess I'm not totally clear on this, but I "think" that 2 heatsinks-with-fans may be needed, with one sticking out the outside and the other inside the case. I went ahead and got 2 heatsink/fans from Newegg for supercheap ($1 after rebate), but they aren't really what I want. They're actually shaped to fit some AMD chip. What I think I need is a copper heatsink with a flat bottom a little bigger than the Peltier, and fins... and a heatsink fan attached... and some way to attach it to the Peltier, and through the case to the other heatsink. See? Simple... well it should be but I can find nothing. Next, the power supply. I know it has to be DC, but I don't know which brick to get. I did find a bunch of DC or AC Wall Transformers for sale at alltronics... around $10 or so. All that stuff would be enough... at least to test the cooling power. But if we want to go whole hog then the icing on the cake would be thermostatic control of the Peltier. Well, I throw that out in case one of you is sharp in that field.

Topic by Knuten 11 years ago  |  last reply 8 years ago



"Contactless Dynamo" / Wind generator showing weird multimeter readings? Answered

I am trying to replicate this, more or less, It's a setup using hard drive magnets and the coil from a relay to generate electricity.  My problem is that every configuration I have tried gives me weird negative and positive numbers(around -20  to 20, constantly changing while the magnets are spinning), and only in the hundredths of volts setting(on the multimeter, the volt, and thousands of a volt settings show nothing).  I have tried using: hdd magnets and round magnets (8 of them in a N-S-N configuration);  a relay coil, a small transformer coil, and winding my own coils 3 times.  The hand-wound coils have approx. 159 turns, 200 turn, and 250 turns, all with thin very thin enamel-coated wire, as it's my understanding that thinner wire will output more voltage.  No matter what configuration, I get the same erratic readings.  What am I doing incorrectly?

Question by chrispaccord 6 years ago  |  last reply 6 years ago


Trouble out putting a DC current to AC current?

Im looking for a way to use a 9v DC current to regulate an AC current.  I have a set up a diagram of my problem: I thought of using a relay but i would like the light to be able to dim not just either be on or off, then i thought of a transistor but im not sure if that will work with both ac and dc at the same time.  I could really use some help here.

Question by keeperrico 8 years ago  |  last reply 9 months ago


Voltage Control: 20v DC

I am trying to find an electronic part that will take in anywhere between 12-36v and put out a consistent 20v. What could do this? And how can I get one? If amperage matters, I'll probably be putting between 1 and 4 amps through it.

Topic by V-Man737 10 years ago  |  last reply 10 years ago


3W LED driver?

3W LEd driver with 9V dc and 350 mA output runs on ac mains supply.

Question by gaurravi11 5 years ago  |  last reply 5 years ago


MATLAB Simscape Power Systems & Electronic ?

Hello! I need tutoring MATLAB Simscape Power Systems and Electronic. I am working on a project in which I am trying to simulate Photo voltaic panel charging battery with controller ( dc-dc buck-boost converter) with Maximum Power Point Tracker and without it. I need to calculate efficiency for both cases. I have stared part of it with searching online Please, if you can help let me know

Question by skumu 2 years ago  |  last reply 2 years ago


How can I make a thermoelectric ipod charger using a mintyboost, a peltier, and lots of heat?

I recently found a article about a Japanese company creating a camp-fire ipod/phone charger. http://tes-ne.com/PDF/epan.pdf (not spam) It appears to use a peltier thermoelectric hooked up in reverse embedded in the layers of the bottom of the pot. And the black control box is either a joule thief or a circuit similar to a mintyboost. As it is so tiny I can not imagine it has a 7805 5v voltage regulator or other similar overly simple circuit. I thought why should I spend nearly $300 on something I can make for $10-$50? I have also noticed there is a thermoelectric powered lamp on this site. My question is this, does anyone see there being an issue if I modify the thermoelectric lamp project and instead hook it upto a mintyboost to charge a couple of rechargeable batteries. I am not sure what sort of amps lets say a 100w 12v peltier would put out when reversed. I have found one for $8.09 here. And if I did attempt this (and document it for an instructables), what might I need to do to modify the mintyboost to directly charge from the peltier? I know only very basic electronics, such as what every component on a mintyboost does. So this is basically a project to learn more about electronics. Should I simply follow a solar power mintyboost tutorial? I have a couple of ideas of how to create the temperature difference for my needs. I was thinking of buying a pack of sterno cans, so I can quickly produce the heat needed and charge my all-important ipod touch in an emergency "holy crap the entire electric grid was fried by a solar flare and I won't be able to charge it ever again" situation. And also experimenting with producing enough heat from direct sunlight using black materials and a "hotbox" (this method will come later as it takes more experimenting). Side note: This is not my only emergency ipod charging project I am putting together. I am also cannibalizing some garden solar chargers and their joulel thieves, but it's been done to death, and a thermoelectric charger is so much cooler is it not? .. or hotter..

Question by stakahashi 7 years ago


How to match the load of a DC-converter?

Hi! I'm having a few TEG-elements (TEP-1264-1.5) that I want to put best use of and plug them in to a circuit in one end and get a 5V USB in the other end! They are acting somewhat similar to solar panel and a matched load (in this case 2.0 - 2.8 Ω for each) is needed for optimal performance. They will provide during matched load 2.5-4V and 0.5-1.5A and I'm planning on putting two of them in series. I have been looking at a MPPT design, but those seem to be based on the fact that they are charging a 12V battery that can accept a wide range of input voltages and therefore it's possible to have a DC/DC converter that just adjusts the conversion. In my case I wan't exactly 5V but I can accept various currents 300mA - 1000mA, so if I know my Ohms law right I should be able to get a load resistance of ~1 - 16 Ω which is quite far out of range. Is there any way to design a circuit that has a matched load of 2.0-2.8Ω (or will it be twice if they are in series?) while still being able to give a constant output of 5V?

Question by Granstubbe 1 year ago  |  last reply 1 year ago


Conventional current. A question about DC current flow. Answered

I just started reading electronics for dummies and it tells me that DC current flows from negative to positive.  It later states that in the early days of electronics it was assumed that current flowed from positive to negative.  Later they discovered that it flows from negative to positive.  Some schematics will have an arrow for current flow going from positive to negative (conventional flow).   Why do they still do this if they know the current flows from negative to positive?  This is confusing.  Thanks.

Question by pennsteve 9 years ago  |  last reply 4 years ago