Batteries charger and PSU circuit

Here's a circuit diagram of the power supply and battery charger.

Batteries charger and PSU circuit diagram

There are two parts in this circuit, ie the battery charger with a fixed output voltage, which is 5VDC. Another part is the regulated power supply that can be regulated output voltage between 2-9 volts.


About Power Supply
A power supply is a device that supplies electrical energy to one or more electric loads. The term of "power supply" is most commonly applied to devices that convert one form of electrical energy to another, though it may also refer to devices that convert another form of energy (e.g., mechanical, chemical, solar) to electrical energy.
A power supply may be implemented as a discrete, stand-alone device or as an integral device that is hardwired to its load. In the latter case, for example, low voltage DC power supplies are commonly integrated with their loads in devices such as computers and household electronics. More explanation about power supply can be found at

This is the tutorial about "How to build an AC to DC power supply ". The video tutorial covers the basics of diodes, bridge rectifiers, and how to build simple unregulated AC to DC power supplies than can handle a few mA up to several Amps.

Watch the video:


ralen said...

This circuit is good enough to work for low voltage, but for higher voltage it needs some improvement , may be little bit on the power regulation part.

power supplies