Now, with the explanation of how bad this is, on to what this actually does: this is a duel power supply unit for a miniature bread board built into an Altoid tin. The basics of it are two 2-way switches: one for on/off, the other for 5v and 3.3v. Along with the switchs, there are two LED's, one for each voltage level. However, this is broken somewhere, giving out a 4.3 and a 3.1 voltage levels. But the principal is still sound!
Here is what you'll need
-Some perf board
-Two(2) 3m green LED's
-Two(2) 2-way switches
-Miniature bread board (Radioshacks work the best, as they have foam tape)
-Wire (22 gauge will work)
-Four(4) 1N4001 diodes
-78L05 voltage regulator
-78L33 voltage regulator
-100 ohm resistor
-33 ohm resistor
-100 uf capacitor
-10 uf capacitor
-9 volt battery clip
-2-part epoxy or similar glue**
And then some tools
-Soldering iron +stand (just because it's handy to have, and safe)
-Solder pick or similar (really anything to poke holes in metal with)
-Needle nose pliers or tweezers **
-Hot glue gun (with glue, of course)**
**Not needed items, but may prove very useful
Step 1: The Schematic
I ended up using two diodes in this after each of the regulators to ensure no backward current damaging them (which may be where the flaw is at)
Step 2: Prep the Tin
While were toying with the tin, we might as well get some other bits and pieces mounted in here. Personally, what I did was mount the power leads, switches, and LED's now.
First, go ahead and get the power leads dealt with. Cut your wire, strip it, and bend it as needed. Poke them into the tin, and strip what you need to strip from the inside
The LED's were placed in their holes, and their leads bent to better suit the opening. Once they were shaped, I soldered them together, and also soldered on the resistors. I didn't actually mount a wire for ground/negative from the LED set until it was in the tin, which lead to some fun times in a small space.
Step 3: Begin the Assembly
Once you have the perf board cut, go ahead and build the circuit. Keep in mind, you will want to mount wires to go to the switches, along with tin said wires. With the circuit made, the peak of funness will begin: wiring things together.
Go ahead and wiggle the circuit in place, pulling the wires for the power supply (the ones that go to the board) into the circuit board (if needed) and make sure everything will reach where it needs to. Once you find that special spot, go ahead and break out some glue and glue that sucker in place.
Once the board is in place, and the glue is dry, go ahead start soldering leads from the pre-mounted portions (which, if you followed this step for step, will mean a ground for the LED, two resistors, and five wires) to the board.