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17.07.2015
Before building the circuit, you must determinate how much current will be used to charge the battery or battery pack.
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.
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If you need to continue using your computer, either plug in your computer, or shut it down and then change the battery. It is advisable to charge the battery with a current that is 10 times smaller then the battery capacity, and to charge it for about 15 hours.
If you want to charge faster, then a charge current of 200mA can be used for about 7 hours. When faster charging is used, it is advisable to discharge the battery completely before charging.


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.
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.



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