Mobile phone charger from dry cell AA/AAA 0V to 2.4V

Charge mobile phone from dry cell AA or AAA 0V to 4.5V from a simple easy to make using less component mobile phone charger.

We all know that for the cell phone to charge, charger output must be above 4V and which can deliver a maximum current of 500mA if used from dry cell or AA type battery.

Here our charger circuit will step up the voltage from 1.5V to 5V DC to reach the cell phone charging requirement. The circuit uses only an AA or AAA 1.5v battery (1V to 2.4V). The charger is composed of simple oscillator, a rectifier, and voltage regulator.

CIRCUIT DIAGRAM:

The feedback winding F  here is composed 5 turns of #30 AWG magnetic wire and main winding P is composed of 6 turns of #24 AWG wire.
The 5.1V zener diode and 2200uF capacitor here regulates the output voltage to ensure proper charging of cell phones.

Here the windings are not very critical, you can experiment using different number of turns here. If ever the charger doesn’t have any output, try to reverse the winding connection.

This cell phone charger can charge the cellphone battery only for short period of time because the 1.5 volt battery power capacity wattage is much lower than the phone’s battery.

So this can be used when there is emergency when we travelling to such places where there is scarcity of electricity.

For any further query please ask them in comment section i will be happy to answer them.

Simplest 5V Transformerless Power Supply Circuit

How to make Simplest Transformerless power supply for low current and low voltage application(5volt 150mAmp) using a IC-LR645

By:Alok kumar

Some of the followers of this blog have requested to post a simple low current and low voltage i.e 5volt & 100mAmp. So today i am going to post an transformerless power supply which is not only easy to construct but also very cheap and small or compact electronic circuit. This electronic circuit can be used to for various purpose like charging small li-ion batteries e.t.c. In this circuit we are going to use IC-LR645 which can control any voltage between 24 and 270 V AC and produces DC voltages below 15 volts at the output, which becomes ideally suitable for operating condition.

The great thing about this circuit is that it does not include or incorporate any bulky transformer but it also dont uses high voltage polar capacitors here. So no worries about surge current and we don't need crowbar protection circuit here.