I decided to build the Adafruit adjustable breadboard power supply (http://www.adafruit.com/products/185
) unfortunately perhaps, during a week when the full kit was out of stock. I sourced the components myself from a couple of popular vendors and bought just the board from Adafruit, and assembled it myself. Now that I'm done, one side works fine, and one doesn't.
The pins marked "VO" next to the red led, and the inner "Vout" pins next to the potentiometer work correctly, delivering 3.3v, 5v or adjustable voltage as determined by the voltage selector switch. The pins on the opposite side labeled"Vi" or the inner adjacent pins next to the potentiometer labeled "Vin"as well as the two screw down posts in the back (behind the red led) all deliver 15 volts (from a 15v wall wart) no matter what voltage switch selection or potentiometer setting I use.
Anyone every build this kit and see similar behavior? Any tech support read these posts, and have a suggestion? I've searched the forums here and haven't found any relevant posts.
I took a very close look using both x5 and x10 magnifiers and I really don't see any solder bridges. I'm a little disappointed, as I was hoping to look at this as the next step in my hobby - sourcing the parts myself at least, if not my own engineering. I simply followed the parts list provided on the power supply 'make' page. Ah well. Any suggestions to fix this appreciated.