Instructables
Micro PSU to power a breadboard with 5 volts.
Connect to 9V battery, 12V or any other DC powersource from 8 to 18 volts.
 
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Step 1: Components

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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.

Step 2: Minimize

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Place all the components on a perfboard to see how tiny you can make it.
I won't give any detailed instructions here, as the size and layout of the parts you use may vary from mine.

Put the components in as tight as you can, while verifying that you can in fact complete the circuit on the underside of the board without adding any wires.

When you've found your minimum size, cut out the piece you need.

Step 3: Solder

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when you have figured out a way to squeeze your components together, it's time to solder.

Check the pictures to see how I did it.
How did you solder the 2 pins (for in the breadboard) on the board without using wires?

P.S.: nice soldering!
dboone6284 years ago
 Nice PSU. Could you put the switch on the Vout of the 7805 instead?
qwertyboy5 years ago
how did you solder like that? whenever i do it, the solder all clumps together onto one pad.
ktalex5 years ago
i have to take soldering lessons from u seriously my soldering sucks so much. i burn half of my projects.
That is some beautiful soldering!
baki226 years ago
good project,i need 12v dc 1000amp