What is a Step Down Transformer?
Transformer is a device used to step up or step down the input
voltage. A step down transformer reduces the input voltage and provide a lower voltage at output. A transformer works on the principle of mutual induction.
What is a Rectifier Circuit?
The output of a step down transformer is an AC voltage. But we need DC of the same voltage. A rectifier circuit is used to convert the AC voltage to DC. There are three main types of rectifier circuits.
1. Half wave rectifier
2. Full wave rectifier
3. Bridge rectifies
We are going to make battery charger working on a Bridge rectifier circuit. A diode is the main part of a rectifier, which converts the alternating current to direct current.
Circuit diagram of a dc charger with bridge rectifier is shown in
figure. A bridge rectifier uses 4 similar diodes and a filter capacitor.
How to make DC battery chargerYou need to buy the following components from an electronics shop.
1. Step down transformer 7.5 volt 500 mA
2. Four diodes IN4007
3. Capacitor 1000 microfarad 16v-1
Connect the components as shown in the Circuit diagram. You are done!
Charger is ready to use. You can use this device as an AC adapter or
as a charges for 6V battery. Buy some components such a box to hold
the componets, two pin wire, insulation tap etc to secure the charger.
What's next, lets start now! I think you have a doubt about the
circuit. Share with me. I Can help you.