5V Power Supply withouth using 7805

[timy]

5v 5a 7805

I need to build a simple 5V power supply DC. I have already built a transformer and rectifier parts of the circuit. I think i know how to do the smoothing part as well. However, when it comes to building the regulation part of the circuit i donno how to do this because i can't use 7805 regulator and i have a number of different diodes and transistor at my disposal. i would appreciate any help that anyoone can provide on this as i donno where to start. thnx

 

[IanP]

simple 5v power from 7805 transistor

Here is an example of a 5V regulator based entirely on discrete components ..
The current limit circuit build around Q4 and R2 limits the output current to roughly 0.65V / 0.47Ω ≈ 1.38A, so if you need different current limit change R2 to the desired value ..

Also, see: **broken link removed**

Regards,
IanP

 

[qutang]

your design is simple but efficiency.

 

[manojshukla]

Its efficiency is not much higher.

 

[bryanwizard]

I tink u can used a op amp shunt regulator... The of Floyd and Boylestad can provide the necessary literature and theory...

Hope U can make such one...

 

[Bus Master]

try using LM317 from National semiconductors.

Adjustable, simple design, Very common, very cheap and up to 5A.

hope this helps.

 

[KST]

I need to build a simple 5V power supply DC. I have already built a transformer and rectifier parts of the circuit. I think i know how to do the smoothing part as well. However, when it comes to building the regulation part of the circuit i donno how to do this because i can't use 7805 regulator and i have a number of different diodes and transistor at my disposal. i would appreciate any help that anyoone can provide on this as i donno where to start. thnx

Switching regulator as MC34063A is the good thing for U !