USB basic analog electronics board

This is a guide to making a board for under $15 that provides 5 volt power and basic parts used in electronics prototyping.  Most of the parts can be found at radio shack, and still have reasonable prices.  This is useful when prototyping and is good for beginning solderers.

Step 1 Parts and Tools

Tools:
wire strippers
wire cutters
soldering iron and solder
electrical tape(optional)

Parts:
5 leds
5 100 ohm resistors
4 position DIP switch
Momentary pushbutton
5 1k ohm resistors
one small piece of perfboard/veroboard/breadboard
13 long female header
assorted wire, 3+ colors would be good
USB cable, one end must be male/A(standard)
2 10k ohm resistors(optional)
light sensitive resistor(CDS photocell)(optional)

I find futurlec.com is also a cheap place for these parts, but shipping will take a few weeks.

Comments

[jomac_uk]

I am very confused with this one! the title says its a USB PSU, but there isnt a schematic, and what is the purpose of the switches and LED's??

Your other problem is that USB ports are current limited to 100ma each, until you plug in a recognised USB device, if that device needs more then 100ma to operate, the computer will then allow 500ma to pass from that port. As this is not a USB device, the computer will not recognise it, and as a result, the max current available from that port will be 100ma. So if you turn on all 5 LED's, assuming each one draws 20ma (often more) you will have exactly ZERO ma for your project.

So what does it do?