IC LM78XX for Power supply

The 78XX series is the series of voltage regulator IC's, this series of IC's are mostly used in power supply circuit. Due to its some advantages and low cost it is widely used .

In this series of 78XX ,"XX" is replaced by 2 digit depending on its output voltage. Such as 7805 (5 volts), 7806 (6 volts), 7809 (9 volts), 7812 (12 volts), 7815 (15 volts), 7818 (18 volts), 7824 (24 volts).




The IC consists of three terminals:

1. Input (Line voltage).
2. Ground(Common).
3. Output (VReg).

This IC consist of a heatsink, which help it from damaging through heat.

But if the current is more than the IC will get heated very fast, the solution is to join another heatsink to the IC .



I have posted some power supply project based this IC, click here (for 5v power supply circuit)

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Simple 5V Power Supply Circuit

A simple 5V power supply circuit, consisting of few components which can be found very easily. I will explain you the step by step guide to build this power supply.

First of all you need to gather some component given below :

1. T1 :0v-24v Transformer (you can also used 12v transformer)
2. D1, D2, D3, D4 : 1N4007
3. C2 :1000uF
4. C3 :100uF
5. IC : LM7805

I have gathered all the component from the faulty power supplies. Most of the power supply consist of IC LM7805, if you do not find you can buy it.
So Here is the circuit for you,

The circuit above takes the input of 240vAC and gives the output of 12vDC.

This 240 VAC is brought down by a step down transformer upto 24vAC, this AC current is then rectified using Bridge rectifier, (to know how rectifier convert AC to DC click here).

After the rectification, we need to get the current ripple free for that purpose we use 1000uF capacitor C2 (C1 is not their in the circuit above).
Now the thing we need is regulated 5V DC, IC LM7805 does this job.
It directly gives us the output of 5V.
To know more about 78XX series click here (must read it's important)

But the important thing is the current, this circuit gives about 1A,use resistor in series with the load if the current rating of your load is low.

Enjoy the circuit, if any question don't hesitate to comment.

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