Regulated Power Supply

During our 3rd Year at NDDU, we were tasked to create our own variable regulated power supply. As we all know, A power supply is a device that takes an incoming electrical current and amplifies it to levels required by various devices. In many instances, a power supply is also implemented to take the incoming electricity and deliver it across many other electronic devices, often at different preset levels. This project was very shocking at first for we were dealing with AC to DC conversion (step down) power supply and we all know how dangerous AC could be. It was tricky and fun to think how it should be done and handled, but at the end, my group was able t perform and complete the project. We experienced various effects during the test for some reasons. Pictures and schematic diagrams are shown below on how we created our power supply. 

Materials used in making the power supply:

*Transformer, 24V, 2A
* Resistors: 18k and 220 ohms
*Potentiometer, 5k ohms
*Capacitors: 2200uF, 0.1uF, and 1uF
*Plug
*Diode – 1N4001
*Bridge Rectifier
*Heat Sink
*Transistor – LM317
*Printed Circuited Board
*Ferric Chloride
*Masking Tape
*Drill
*Soldering Iron
*Multitester
*Banana Jacks
*LED

Schematic Diagram :

The schematic shown at the top is basically the Regulated Power Supply that we created for our project in Electronics 1.

Note: Be sure to have a transformer with an ampere rating of at least 1.5 A and above. As what I have mentioned earlier, we experienced one problem that was a nuisance in our troubleshooting. That is because, when we created this project  the Ampere rating that we have for our transformer was only 1 A, along with this, when you place a load a huge load, there would be a huge drop on your voltage Why??The answer to this is based on the LM317. The specification on its datasheet is that you must at least have a 1.5 A current rating in order to have this properly worked out. If not, you would experience a huge drop when you would place a load for this supply.

This is our variable regulated power supply output:

CREATED BY:

KIRK BENEDICT P. MACARAEG

JONALD B. SARMIENTO

LEO PATRICK PANTI