This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall adapter with variable output voltage are available from any electronics shop and supermarket. Those adapters are easily available, but usually their voltage regulation is very poor, which makes them not very usable for digital circuit experimenter unless a better regulation can be achieved in some way. The following circuit is the answer to the problem
This circuit can give +5V output at about 150 mA current, but it can be increased to 1A when good cooling is added to 7805 regulator chip. The circuit has over overload and thermal protection.
I have just made one which you see in the picture above where I have added two header pins so that it can be easily plugged onto a solderless breadboard.
fine thanks
Why +ve and -ve rails are sorted after the LED?
if I change the Component “78o5 regulator” to a higher “7807 to 12″.. Do I need change the Capacitors value too?..
The Supply and Ground are Sorted after the Led.. Short Circuit!!.. sometimes I don’t believe on Simulations.. but How About This?..
Question: Does It Work on Actual.. Or it is better on that way?
Nice work!! sir..
@Genorie Velasquez. The general rule of thumb is, you use the capacitor with double voltage rating. e.g.: If you place a 100uF capacitor accross 7V, the voltage rating of the capacitor must be at least 14V (~16V). Regarding the value of the capacitor, whether you will use 100uF or 470uF or 1000uF, that depends of the output load. If you are using a microcontroller that requires less power, a small 100uF would be enough. If you are planning to drive motors and microcontrollers together, you better use a bigger cap (i.e.: 1000uF), so that at the pick load the motors don’t suck all the power which is mandatory to prevent the microcontroller from being reset.
Regarding the “short circuit ” issue. You got it right. The schematic was drawn wrong. Sorry about that. But you know how to fix it.
Note: All the schematics in this website are implemented first and then posted (not theoretical).