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21.02.2016
Setting up a webcam sight illuminator over your laptop's webcam will certainly “enlighten” your online conversations. This battery charger circuit can be used to charge one or more batteries with the total nominal voltage of 12 V, meaning ten NiCd battery or six 2 V lead acid. We can use a transformer with 18 V on the secondary and then using a diode bridge to rectify the 18V ac voltage we get 22V dc on C1.
The completely discharged batteries are charged at the begining with a 6 mA current thru R2-D2 and R4-R6-D1.
If the battery is connected with reversed polarity or there is a shortcircuit, the power transistor T1 remains blocked and the charging current can not exceed 6 – 12 mA.
While might be good for charging NiCd batteries (that I don’t Know), this circuit is useless for 12V Lead Acid Batteries(that I do know well).


You must have used some strange datasheet if you say that BD140 is NPN… It is PNP and has been like this from its birth, when the silicone met the plastic case for the first time. 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? To prevent that sensor Q1 is warmed up by its own current draw, I recommend adding a cooling rib of sorts.
For this powersupply to work efficiently, the input voltage has to be minimum 3V higher than the output voltage. The incorect usage is impossible: connecting the batteries with reverse polarity, shortcircuit of the output terminals or power loss have no impact on the charger or battery. Open the regulator, replace the 56 Ohm resistor marked as VR1, with a 100 Ohm trim pot, via two tiny wires.


I have more than one car, and while not in drive I trickle the battery to keep at 12.9 V on REST (without charging element). Periodically you have to equalize the elements of Battery, This can be done increasing the charging voltage, periodically, to 14.5 V for 2 hours.



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