how to make 4v battery charger

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:


https://drive.google.com/open?id=1OLB...


https://drive.google.com/open?id=12bd...


previous videos:


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