Learn how to make a simple inductive battery charger for your NiMH/NiCd rechargeable batteries(2 to 4). The circuit in the video is for charging (2) batteries in series. This circuit operates in a very similar way as an ultrasonic toothbrush charger. The charging rate is slow(25-30mA), which can be made higher if desired, but it does charge well. The toothbrush charger uses a PWM IC to produce the high frequency pulses (75khz) into the primary winding with feedback to adjust the output under load, and this circuit uses a 555 IC to produce 42-46khz pulses into the primary winding to simplify the circuit. The transformerless power supply shown in this video is designed to power the exact circuit shown in this video. If you modify the primary winding and the circuit draws more current, then you will have to modify the transformerless power supply to deliver more current. You can also power the circuit using a very small 12V transformer. Don’t be afraid to experiment with different coils/windings!
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This Capacitance battery charger is good for those who want to refurbish a battery because it will also desulfate a battery. It’s very simple to build and can be used without even mounting everything inside a case.
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Three amazing coin battery experiment, Run emergency led light, charge your phone using coin.
If you use copper coin every cell will produce .7 to .8 volt 2 – 4 ma.
for 5 volt we need at lest 8 cell
So if you want to charge you mobile phone at 500 mp
you need 500*8 = 4000 coin.
I don’t have this much coin but if you make this much cell definitely it gonna charge you phone.
How to make a portable charger?
Home made portable power bank.
Turn Coins into mobile charger USA. America
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With nothing but a battery charger and my girl-power, I solve a thorny rust removal problem.
As you can see, the underside of my rear fender has a lot of surface rust and is very pitted. To remove this rust, I have a few options. I can remove it mechanically, using a wire brush or a sandblaster, however, I would run into a few problems.
First problem: There is a few tight corners where it would be really hard for me to reach all the rust. Two: I might heat the metal to a point where it warps, and Three: I might thin down the metal too much.
I could also remove the rust chemically, however, that also has a few problems. The first problem is that it’s not environmentally friendly to dispose of the wastes. The second problem is that it’s fairly costly. If I were to use the best solution of chemical removal, it would have to be half vinegar, half water. And even for me to fit this fender in that solution, I would need 375 gallons, and that would cost me about $500.00. And also, even that, with removing it, I would kill a lot of fish here in Teddyland. And no teddy bear wants to go without fish for dinner.
So let me ask you. What would Chris Hemsworth do?
[Sound Effect] “Schaaaa-wing!”
Chris Hemsworth would use electrolysis.
For electrolysis, you’re gonna need a few key ingredients. First is, obviously, your rusty piece of metal. Second, a car battery charger. Third, your water tank. Fourth, a sacrificial piece of metal, and this piece of metal needs to be cast iron or steel. No stainless steel, otherwise you’ll introduce chromium to your water tank. And hexavalent chromium is a terrible way to get cancer! Fifth, you’re gonna need a form of electrolyte to make the water more conductive. Normal table salt will do, as well as baking soda or sodium bicarbonate. However, the best to use is sodium carbonate or normal washing soda. You’re gonna need about a tablespoon per gallon, and for my 375 gallon tank I needed about four boxes.
Before I start, I’m gonna use dish soap and water to wash any excess oil off the part.
And now I’m gonna submerge it in the tank.
I’m gonna put my sacrificial anode in to where it has line-of-sight to all the most rusty areas of my part and to where it can’t touch the part. For your electrical connection, you don’t want to use anything other than steel or cast iron because any other metal will introduce ions to the solution that will cause problems. So I am using a steel coat hanger instead of a copper wire to connect my piece.
I’ve hooked my positive lead from my car battery charger to my sacrificial anode, then my negative to my car part. Once the electricity starts flowing through this, it’s gonna create two different reactions. The first reaction is when the water molecules’ hydrogen and oxygen are gonna be breaking apart. The hydrogen is gonna be bubbling off of the cathode, then the oxygen is gonna be bubbling off of the anode. Now children, don’t do this in your basement because the hydrogen will also go into the air, and hydrogen is a very flammable gas. And, it is a terrible way to blow off all your limbs! Now, the second reaction is the most important, and the reason we are doing this.
This rust, or ferric oxide, or Fe2O3 is an unstable compound. And so once the electricity starts flowing through this, it’ll become magnetite, or Fe3O4, and become a stable compound.
If you look really carefully along the edge, you can see the bubbling of the hydrogen coming off the cathode. You can also see the oxygen coming off the anode.
It’s been about 5 and a half hours, and as you can see, the water’s nice and foggy with pieces of paint and rust that have flaked off. And the corner of the piece itself has some black where the magnetite has replaced the rust and where the rust is falling off.
Once I got the fender cleaned up, I could still see a tiny bit of rust in the deep pits, so I put it back in to cook overnight.
Here’s a before-and-after of a piece that I have finished and then a piece that I haven’t. These two rear fenders were in roughly the same condition before I started, so you can see that the electrolysis worked really well. I had to use an older car battery charger because the newer one wouldn’t let me run any amps through it unless there was an actual battery connected to it.
I ran my car battery charger at 100 amps, and realistically, it was nearly done at five and a half hours. So if I left it in for seven hours, it most likely would have been completely finished. So if you ran yours at 10 amps, it would be done in about two days.
See ya next time, kids, on Hanna’s Bug!
As always, this show is filmed in front of a live studio audience.
This is a PC board I made so I can charge a 48V seal lead acid battery from any 12VDC source. This design is simple and uses an off-the-shelf audio crossover coil. It charges my battery from a 12V source that gets switched on once the sun goes down. In the morning my batteries are ready to go and it didn’t cost me anything. Energy from the sun. However I can use with and 12V source that can provide 2-3 amps of power. There is a special circuit that will stop the SMPS once the battery level low around 11 volts. Next day the sun comes up and charges the 12V battery.
I used a single-cell usb bank to charge a single cell at a time. I also have a 4-cell usb bank which I would NOT use to charge less cells than 4, as there is increased risk of oversupplying the cells with power.
I actually fried this chip pretty quickly by connecting up a cell the wrong way, positive to negative and negative to positive. Instant hissing and magic smoke! If I had known the circuit was not protected I would have added a diode to protect it.
If your looking for a HIGHLY efficient (6VDC 2.5A / 6VAC 3.0A) power supply or 6V lead acid battery charger, then look no further. This power supply/charger is made using a 120V (MOT) microwave oven transformer, by performing the modifications shown in this video. 120V transformer current at idle(NO LOAD) only draws 30mA, and using a full 2.5A load, 200mA. NO heating issues of the core whatsoever. As usual, always be very careful when working with 120VAC/240VAC projects!
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http://www.EnergyBrainiac.com – How To DIY Solar Battery Charger
The DIY Solar Charger | Popular Science
Jul 6, 2007 … The DIY Solar Charger. Keep your gadgets powered even when the grid … and build frames to hold the DC charger controller and the battery. …DIY: Solar Powered Battery Rechargers
In their latest catalog, several solar battery chargers are offered but one is particularly useful. The small Multi-volt Output Solar Panel (Cat. …Get Prepared Stuff – DIY Solar AA Battery Charger”
Most of the AA solar battery chargers available wouldn’t charge two AA 2000 mAh batteries in 4 days let alone 1 day of 4-5 hours of sun.Solar Battery Charging – Solar
Jul 30, 2007 … One of the simplest DIY solar projects is to make your own solar battery charger using a small Photovoltaic (PV) solar panel. …DIY Solar Battery Charger – Solar Energy How-to-Guide Directoy
DIY Solar Battery charger. Build your own solar battery charger for all of your electronic gadgets.Design Solar-Powered Computing Device – Hacked Gadgets – DIY Tech Blog
DIY projects describing how to build electronic projects. … Solar Battery Chargers – Cheap Solar Battery Chargers and Battery Charger ..
How To DIY Solar Battery Charger
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