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Setting up a webcam sight illuminator over your laptop's webcam will certainly “enlighten” your online conversations. Here is a 12 volt lead acid automatic battery charger that shut off the charging process once the battery attains full charge. If the terminal voltage of the battery reduces below the set level, say 13.5 volts, the circuit automatically turns on to the charge mode. Charging current as well as the power to the circuit is obtained from a 0-18 volt 2 Ampere step-down transformer. When the terminal voltage of the battery increases to 13.5 volts, pin 3 of IC2 gets higher voltage than pin2 and the output of IC2 becomes high. Before connecting the battery, set the input voltage to IC2 using a fully charged battery or variable power supply. It’s mandatory to use a step down transformer since it provides galvanic isolation from the mains. 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?
Can we use 12-0-12 transformer insted of 15-0-15 transformer.because my transformer is 12-0-12. If you have only a 12 volt transformer use a rectifier and 2.5 ohms 10 watts resistance in series with the battery to be charged as a current limiting resistance, no filter capacitor is also required. Hello, I find this circuit and its explanation very interesting and explanatory in its entirety. Hi Fredz it can charge only one partially discharged 12 volt 40AH battery and not for even a flat battery. Hi Hari 4nos BY127 as bridge is ok but 12 volt may not be sufficient, you require 0-15 volt transformer. Hi Nidesh C2 & C3 are ceramic disc capacitors with working voltage of 40volts or above. Hello peter we appreciate all the schooling and guidance but how do we get in touch with u for practical and theory lessons and can somebody study on line and get a certificate or diploma maybe even degree in the electrical and radio telecommunication? Hi Abhi the DC voltage will become low and as the battery voltage builds up your charging current will become too low and the battery may not get fullt topped up. If you have only 12-0-12 2A on hand then use 2nos 1N5404 and a 2.2 ohms 10watts resistance and charge no other electronics is required.
Can I use a 12-0-12 (2A) step down transformer instead of 15-0-15(3A) step down transformer? Hi Seetharaman, what ur saying is I could have a slide switch, if slide switch is moved toward ther 12 volt indication, than with the 2 rectifiers and 1to 2 ohms as current limiting resistance, would be able to charge the 12 volts battery.

Hi Patrick With a 12 0 12 transformer you can charge a 12volt car battery with just 2 rectofiers and one 1 to 2 ohms current limitting resistance. HI Seetharaman, IS there a possibility of adding a toggle switch for 6 and 12 volts charging and toggle switch for slow and fast charging in this circuit. Hi since this is regulated voltage charger with a flat battery at the start of charging the current will be at 3amps, gradually decrease and once the terminal voltage reaches the rated voltage the current will reduce to minimum and it will be just doing the topping up function, hence no additional circuit is required. I need to build my own power supply for 220 volt ac to 12 volt dc around 30 watt is ok,it must be reliable for LED signage,,can I be assisted? In the previous post we haveA A seen the circuit diagram of 9v battery charger circuit using LM311 and SCRA .In this post let us see the circuit for recharging Lead-Acid battery using Solar panel.
Here is the simple circuit to charge 12V, 1.3Ah rechargeable Lead-acid battery from the solar panel. Solar battery charger operated on the principle that the charge control circuit will produce the constant voltage. Circuit must have adjustable voltage A regulator , so Variable voltage regulator LM317 is selected. Schottky diode isA  used to protect the LM317 and panel from reverse voltage generated by the battery when it is not charging.
If the battery requiresA initial current more than 1.5A,it is not recommended to use LM317.
All the above mentioned parameters have to be taken into account before charging a battery. In this project, power is limited because of the thermal resistance of LM317 voltage regulator and the heat sink. I require circuit diagram of solar current controller of 48 volt 30 amp solar current controller.will you please provide me circuit diagram of above. I want to use a solar panel, but I want to automatically stop charging the battery when it is full as well. The low voltage AC is rectified by the bridge rectifier comprising D1 through D4 and made ripple free by the smoothing capacitor C1. If the battery to be charged has a different capacity, the theoretical value of R1 in the table must be divided by the battery capacity.
The transformer T1 steps down the mains voltage and diodes D1&D2 does the job of rectification.
Once the battery terminal reaches around 13.6 Volt, the charger will only start trickling, hence no problem. This will be the simplest charger watch for the terminal voltage once it reaches 14 volts terminate the charge, as the peak DC voltage can reach 12 X rt2(1.414).

To charge a 6 volt battery you have to add one thyristor after the full wave rectification with zener and transistor to limit charging voltage at 6.9 volts. This solar charger has current and voltage regulation and also has over voltage cut off facilities. For charging purpose, 18 volt DC is used while to power the circuit, 9 volt regulated DC from IC1 is used. Charging current to the battery cut off and the relay remains as such since the battery voltage(13.5V or more) keeps the voltage at pin3 of IC2 is higher than that of pin 2. Current limitting can also be achieved by limitting charging current at 30% of the rated capacity of the battery.
This solar energy is not only used on the Earth but also used in space stations where no electrical power is available.
This circuit may also be used to charge any battery at constant voltage because output voltage is adjustable. The output voltage and current are regulated by adjusting the adjust pin of LM317 voltage regulator. LM317 voltage regulator internally has temperature limiting circuit so that if it gets too hot, it shuts down automatically. Im doing a project for my HNC level 4 Electrical and Electronics engineering so i will need to alter some parts.
The charging current passes to the battery through the NC (Normally Connected) contacts of the relay. If the battery takes charge, current to pin 3 of IC2 will be low since most of the current drain occurs into the battery.
Resistor R1 serves two functions: it establishes the correct charging current and it drops sufficient voltage to light the diode.
Note that the adaptor must be capable of supplying a current of not less than half the battery capacity. The LED will glow brighty to start with and slowly it will dim down as the battery is nearing its rated charge limit.
When the battery voltage increases above 13.5 volts, no more current passes into the battery, so that the voltage at pin3 of IC2 rises and relay turns on.

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