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simple 5v breadboard power supply

by:Fuyuang     2019-12-29
When I build the circuit on the breadboard, the first problem I always have is to create 5 v to power the component.
Of course, there are a lot of pre-made power-
You are perfectly suited for the power supply of the breadboard power rail, but I want something that I made myself and I can use it with all my circuits.
In this post, I will introduce the power I came up with, and a step-by-step guide to redesign
Create a circuit.
First of all, yes, there are easier choices, such
Power supply of bread board made.
But if, like me, you like to build things from scratch and understand what you create, then you might want to dig deeper and assemble your own power supply.
This price is equivalent to this pre-
Made one, but you will be satisfied with the DIY circuit.
Please note that we will create a 5 v power supply.
You can use this guide to create any voltage you need, only the regulator is different but the process is the same.
If you like this Instructable, feel free to visit the embedded lab for more tutorials on embedded systems!
Of course, there are bread boards and some wires.
I used a small breadboard at 170 and its size fits perfectly with it, building the circuit on a separate breadboard will allow us to use it in any circuit in the future.
The Jack barrel we use has 3 pins and it can be tricky to find out which one.
On the picture, the pin is: LM7805 is 3-
PIN devices that will convert 7 v-
The 35 v DC input voltage is a stable 5 v DC voltage.
For micro-controllers and other integrated circuits, it is essential to have a stable supply voltage, because changes can lead to unstable behavior.
The LM7805 can output up to 1.
5A, but it generates a lot of heat at a higher current.
For this reason, it is better to add a radiator if you output more than 500 mA with it.
We will continue to use this number in this tutorial, so we don\'t have to worry about it.
As shown in the data table, the 3 pins are: view the picture of the actual assembly to locate the pins.
If you look at the regulator and you can see its name, then you have pins 1, 2 and 3 from left to right.
Now we add these two capacitors.
We will connect 0.
33 uF capacitance between input and ground, 0.
There is 1 uF capacitor between the output and the ground.
The attached schematic diagram shows this circuit. And we’re done!
That\'s the power we need, and we can use it to power the micro controller or other components.
Before connecting anything to our power supply, let\'s test it to make sure everything is connected correctly.
First insert the wall adapter into the Jack bucket and then into the wall.
Now use a multimeter, on a DC caliber greater than 9 v (
Or than the output voltage of your wall adapter), Stylus 1 (input)
LM7805 with positive test leads and pin 2 (ground)
Under the leadership of COM
It should be 9 v, which means your wall adapter works fine.
Now keep the COM lead on pin 2 and touch pin 3 of LM7805 (output)
Positive leadership.
It should be 5 V now.
Congrats, your power supply is ready for use!
It\'s always good to know if our power supply is on.
Sometimes it reminds you that after finishing the circuit work you forgot to unplug it and sometimes it tells you the reason the circuit didn\'t do anything just because your power is off.
Connect the anode of the LED to the 5 v we just created and attach its cathode to the free node on the bread plate.
Then add a series resistor between this new node and the ground.
Depending on the LED you are using, you may need to try a different value for the resistor.
Using a 3mm Green LED, I used an ohm resistor because a 30 ohm resistor made it too dark.
The circuit should be like the schematic diagram above.
Now, whenever our power supply is ready, the LED turns on and the LED turns off when it\'s not ready.
While a good wall adapter will have integrated protection, it is never a bad idea to increase the level of security.
Simply add a 500 mA fuse in series between the positive pin and pin 1 of the Jack barrel (input)of the LM7805.
If for some reason your circuit consumes more than 500 mA, the fuse will fuse and prevent damage to the Assembly and adapter.
Of course, depending on your needs, you can choose a different value for the fuse.
The final circuit looks like the schematic and the circuit shown on the board above.
As you can see, you can make it simple or complex.
Explore different regulators, test different circuits, and make sure to comment and show what you \'ve created!
Now that you have a functional power supply for your breadboard, check out the embedded lab and learn how to use the micro controller, as well as many other embedded system tutorials!
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