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. 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. 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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