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Setting up a webcam sight illuminator over your laptop's webcam will certainly “enlighten” your online conversations.
Here is a solar charger circuit that is used to charge Lead Acid or Ni-Cd batteries using the solar energy power.
VR is placed between the adjust pin and ground to provide an output voltage of 9 volts to the battery. Please Sir, how do you calculate the base resistance used alongside the Zener diode to switch on the cutoff transistor?
You cannot charge a laptop with a 10watt 12volt solar panel., you need a minimum of 36v solar panel with at least 30watt capacity.
I want to use a solar panels having capacity of 12 volt that can provide sufficient energy to charge a battery of 8.4 volt.
So thinking some thing wrong I have done another circuit which is also giving same 7 volts output even after adjusting VR. While it is intended for charging a lead-acid battery, it works OK with other battery types as well. Recent QuestionsTimer for Varroa Mite Treatment electronically controlling a 220V heating wire To run Microwave when power supply isn't there, what type of battery can I use Problem with playing back voices how can an AVR get a generated sin wave by matlab,using serial interface and realize it using DAC? One of the coolest parts of working on the Yahoo Purple Pedals project was figuring out how we could get the bikes as far off the grid as possible. We discovered that inside the flat cable are two conductors, one bare and one coated in red enamel. Now that we knew the acceptable range for charging the phone we had to find some solar panels that would fall within this range, fall within our budget, and look cool on a bike.
We ordered one to try it out, expecting that we would have to build a circuit between the panel and the phone to actually get it to charge. Now we wanted to know how long it would take a single solar panel to charge a depleted N95 on a sunny day. We could have stopped there, connected a solar panel directly to the phone and, as the phone ran, the panel could top off its charge.
After extensive battery research, we decided on an old standby, friend of cars and boats alike, the trusty sealed lead acid battery.

I made only minor improvements to it and it can charger a variety of phones and other devices. The circuit harvests solar energy to charge a 6 volt 4.5 Ah rechargeable battery for various applications.
Resistor R3 Restrict the charging current and diode D2 prevents discharge of current from the battery. Once we decided on using the N95 as the brain for the bikes, we had to figure out how much juice it takes to run the code, how often the code was going to run, and how we could prevent our users from having to plug-in the bike everyday like a cell phone. On the first hacked adapter the red wire was ground, but as we later found out it was completely random which wire color was mapped to which power source inside the charger. With low expectations, we soldered the already hacked charger tip to the solar panel (double checking the polarity of course) and took a trip to the roof on a sunny day. To figure this out we needed to know how much energy we were getting from the solar panels over an extended period of time. Originally, we thought we could just buy a 10 amp hour lithium ion battery and use that to feed the N95, but as it turns out they are not only ridiculously expensive but also require specific charging circuitry which we couldn’t find for batteries large enough to suit our needs. We added a switch so the user could choose between solar charging and wall charging, we added a couple diodes to keep the power flowing the right way, a fuse just in case, and a zener diode with a threshold of 4.1V connected to an LED to indicate when the battery is run down past the point where it will charge the N95. When the terminal voltage of the battery rises above 6.8 volts, Zener conducts and provides base current to T1. I wanted to know how to upgrade this circuit bye adding LEDs to show the charging process and charged process. After thinking through and testing out a few different ideas, we settled on solar power as the simple, inexpensive, green, and aesthetically pleasing solution. Once we got at the wire and got our polarity figured out we figured it would be easy enough to just clip onto the bench supply and start testing. For $35 it outputs over 8 volts and 300 milliamps in direct sunlight, beating all others that we found in its price class. In the following walk-through I am going to explain the design process and how we got from the idea of using solar to creating a solar replenishing backup power system that can run off the grid for weeks on end.
The factory charger was a regular 5V AC adapter which output about 7.2 volts DC at 880 milliamps.

Further tests showed that the solar panel would charge the phone in very low light conditions and even indoors under an incandescent bulb. The next step was to figure out the minimum and the maximum power levels the N95 could take in at the charge port and still charge correctly.
Even with the bench supply set at 7.5 volts and current limiting set to 880 milliamps the phone refused to make its little beep and display the charging animation. Our idea was to cut the tip off the power adapter, test the polarity of the wires inside, mate it to a variable power supply, and see what happened to the N95 as we cranked up and down the juice.
On a hunch we tried putting a resistor between the charger input and the bench output, and somehow, even though the bench supply was supposedly already current limiting, for some reason this worked.
We could have hooked a single solar panel up straight to the battery with nothing but a diode indefinitely. The N95 charger uses a flat cable to connect from the tip to the body, which means you can’t use regular wire strippers to get at the copper inside.
We devised a technique of splitting the wire in half with an exacto knife to create two independent wires which were then possible to strip with regular tools.
However, three solar panels in direct sunlight could give us as much as 900 milliamps, more then the battery’s trickle charge rating. This meant that we needed a simple current-limiting charging circuit that would sense when the battery was getting to capacity and gradually reduce the amount of current supplied. The circuit required just 4 resistors, a transistor and a capacitor in addition to the LM317 and it worked like a charm right off the breadboard. The circuit was originally designed for charging a lead acid battery from a power supply, and the only modification we made was to reduce the capacitor across Vin by an order of magnitude since we were coming from solar panels rather than a transformer and didn’t have any ripple to worry about.

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Comments Rechargeable lead acid battery 6v 4ah makita

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