Simbol kubik di excel
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If it is applied as a simple motorbike battery charger, the circuit as seen in the video is sufficient, easy and inexpensive. If you really need to make a car battery charger from a laptop adapter with a larger current, then the heatsink must be bigger. From the test result it can be concluded that the transistor is still within safe limits. Even if a larger charging current is needed, a circuit with one diode is usually enough for a 36 amperes hour car battery.īased on the 2N3055 transistor datasheet, it is capable of carrying collector currents (Ic) up to 15 amperes continuous, and a maximum power of 115 watts. And the 2N3055 power transistor can overheat, if it produces a higher output voltage. The charger is still being used to charge the laptop battery. I prefer to use the lowest output voltage, because I don't want the laptop charger to be overloaded. The test results on the charging current fot that car battery are: By using a jumper cable, the charging current can be adjusted by selecting the number of diodes connected. The photo below shows the arrangement of the circuit components on a matrix board.īut the battery voltage is quite low at 12.55 volts. Without this component a digital voltmeter will show a higher no-load voltage, which can be confusing. So the transistor output will be around 13.2 volts.Ĭondenser and resistor function as voltage stabilizer. In the transistor, voltage will drop again about 0.6 volts.
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Those diodes can be jumpered to adjust the output voltage. So for two diodes, the 15 volts IC output will be reduced to around 13.8 volts, before entering the transistor base. Theoretically, a single diode will drop voltage by 0.6 volts.
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#SIMBOL KUBIK DI EXCEL SERIES#
Furthermore, the IC supplies current to the base of the transistor 2N3055 through several series diodes. The above circuit will reduce the voltage of 19 volts from the laptop charger to 15 volts with the help of IC LM7815. Tr = 2N3055 power transistor with heatsink
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