Probably most of us have some old phone charger that gives 5V output.
I have one device that use 6V lead acid battery, but original charger burned and I didn't have other solution only make one.
Inside it is a simple DC switching regulator circuit. Also, it can be a 6V 4.5Ah battery charger for 10hr charging.
For example, a power supply for general load and a low current battery charger circuit.
This circuit we can use for charge a 6 volts lead-acid batteries.
And also useful for others: nickel-cadmium batteries,nickel-metal hydride battery(also known as NiMH), etc.
Caution:
1. For the device has various polarity includes the Electrolytic capacitors,Zener diode,all diode,transistor,LED we should be careful in the assembly circuit.
2. If the output voltage is at 12V you need change capacito at output rail to 470uf 25V.
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