how to make 4v battery charger
hi friends in this video i have made a 4v battery charger it is made using common and easily available components. It has auto cutoff feature which protect your battery from being over charged. I hope this video will be helpful to you please like share and subscribe.
Components:
1- 1X BD139 transistor
2- 1XBC557 transistor
3- 2X BC547 transistors
4- 2X 100 ohm resistors (1/4 watt)
5- 4X 10K ohm resistors (1/4 watt)
6- 1X 1N4007 diode
7- 1X 10K variable resistor
8- 1X red led
9- 1X blue led
10- 1X 100uf 50V capacitors (electrolytic)
11- 1X 5mm dc female jack
12- vero board
13- jumper wires
14- 6V power supply
Circuit diagram:
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