5V breadboard mini PSU

Micro PSU to power a breadboard with 5 volts.
Connect to 9V battery, 12V or any other DC powersource from 8 to 18 volts.

Step 1 Components

To build this you need:

• Some electronics skills. Soldering, knowing how to follow a circuit diagram etc..
• 1 voltage regulator LM 7805
• 1 10uF capacitor
• 1 1000uF capacitor (you can use any big electrolyt capacitor here, doesn't have to be exactly 1000uF)
• 1 100nF capacitor
• 1 LED for power on indication
• 1 resistor to to take the voltage down from 5V to whatever your LED runs at
• 1 screw terminal for the input voltage
• 1 switch for input voltage on/off
• 1 perfboard, the type with copper eyes, not stripes
• 1 2-pin connector to plug the unit into the breadboard

Resistor calculation

R = ohm of resistor
V = voltage for the LED (You can find this in the datasheet for your LED)
I = current for the LED (can also be found in the datasheet)

R = (5-V) / I
Then round up to the nearest resistor value you can find.

Comments

[phillyj]

Anyone know what the ceramic cap is for? I don't have 100 pF so can I use a 500pF or 1000pF cap? Thanks

[chr]

The 100 pF capacitor reduces noise. It will work without the capacitors. But to be on the safe side, and provide a stable power source, we add capacitors. The 500pF will work just fine :)

[Atman8]

Hi, it that a 100pF capacitor or a 100nF capacitor? In the photo you show 100nF.
Thanks!

[fruitkid101]

oh sorry I didn't see it at first.

[fruitkid101]

I know how all this works but can you post a schematic? I have a large breadboard and I can just plug all the stuff in a little corner somewhere

[contractorwolf]

ive got a question being an electrical noob. What is gained by the parallel caps? I understand having a single cap to "even out" the flow vaiations on the 5v side, but how are the calculations done for what sizes to use? How does having the particular variety that you are showing: 1000uF then 10uF then 100uF? Thanks!

[bgrablin]

Switchless power supply, intended for the 8x8x8 LED Cube. The Cube already has a switch.... :)

[ktalex]

i have to take soldering lessons from u seriously my soldering sucks so much. i burn half of my projects.

[BrunoG]

Tip: Dont use an arc welder.     :D

[thirtyfivefox]

you are most likely not using the right watt for the project you are own... sometimes it is better to use higher watt irons because they allow you to work more quickly... although your project's sensitivity will depend on the proximity to heat sensitive circuits... a good soldering station might be worth the investment so that you can play with many wattages and figure out which one is correct for the type of work you will be doing...

[mjohnson59]

soo...would this work to use a 12v wall wart with this to power the 8*8*8 led cube

[mole6999]

Will this work to convert 12v auto to 5v usb?

[zack247]

yes it will, but i would reccommend putting a heatsink on the 7805 because it can get really hot from regulating that much voltage.

[heatseeker96]

How did you solder the 2 pins (for in the breadboard) on the board without using wires?

P.S.: nice soldering!

[dark sponge]

how do you cut the circuit board? mine keeps cracking and like, messing up!

[thirtyfivefox]

dremel with straight edge adapter... or a jigsaw works great but can leave crazy lines if you are doing it freehand... some people drill a line of holes close to each other and then snap it like a sheer line... a vise works great for this method...

[ReCreate]

you could try using cable cutters

[dean-101]

i use a coping saw. but i dont use that type of board. i get fiberclass strip board and use a circuit breaker to cut the tracks that are need to make a pcb type of thing. you get the boards at www.maplin.co.uk

[dark sponge]

Thanks!

[baki22]

good project,i need 12v dc 1000amp

[thirtyfivefox]

lol you trying to liquefy flesh?

[terrapinlogo]

I think you mean 1000milliamp 1000 amps is 100 times what most household outlets put out

[ReCreate]

so outlets are like 10 amps?

[terrapinlogo]

yea most household outlets are 10 amps but there are some that are occasionally 15 amps

[TheDeviant13]

my shed had 3 20 amp 3 prong outlets and one 100 amp outlet for an AC arc welder

[terrapinlogo]

ok i havent seen a 20 amp outlet personally but that doesnt mean they dont exist and the 100 amp outlet is proabaly 3 phase

[ReCreate]

interesting...

[Derin]

actually 66.66666666666666666666666666666666666666666666666666666666666666666666666666666666 times

[qwertyboy]

how did you solder like that? whenever i do it, the solder all clumps together onto one pad.

[KT Gadget]

 Usually when you bridge solder two joints, you ball up both pins, then get a little solder on the iron and start applying between the points. If there is enough solder on the iron or the 2 pins or all 3, then the bridge will automatically join together. But do it quickly because you do not want to burn the electronics. If it does not work the first time, add a little more solder until they join.

[qwertyboy]

ok, well i figured it out anyway. thanks. i like this way of soldering, even though it uses a lot of solder.

[thirtyfivefox]

try using flux in addition to the flux your solder might bear in soldering... works wonders...

[junits15]

how do you solder those copper conductor pads together like that? when ever i try it just blobs up.

[thirtyfivefox]

you are probably not using flux... i prefer a pen type dispenser... no clean flux... the stuff i use is made from circuit works... just remember to use it sparingly and make sure you are soldering quick enough so that you don't vaporize all of it from the joint...

[dboone628]

 Nice PSU. Could you put the switch on the Vout of the 7805 instead?

[Adam Manick]

Why would you do that you would have wast battery because it would always be on when the battery is in?

[rockstar1000000]

I am sorry but what does this thing do. I like electronics but I cant get any

[tedn9ne]

I built this power supply and it only provided 3.7 Volts. Thanks to my instructor, Mr. Hewitt, I discovered that all I needed was the:
LM7805
1 screw terminal for the input voltage
1 9 Volt Snap Connector
Jumper wires
Plugged it right into the breadboard. Provides 5.03 Volts.
Thank you for pointing me in the general direction. Hope this helps others to provide 5 volts fixed to their lab project.

[emedina94]

That's Cool! I'm going to use that in the Altoids breadboard thing. Uhh what else can i say. ! I got it !  Hi mom.

[icecreamterror]

How was this not a featured project!

5 stars all round!