How to Use a 12 Volt Wall Adapter on a 6 Volt Connecter
- 1). Test the resistance of the device you need to power with the multimeter, after putting it on the "resistance" setting. The resistance of this device is referred to as the "load resistance."
- 2). Choose a resistor at random. The resistance you choose doesn't particularly matter. It is only the ratio between the resistances in this circuit that is important.
- 3). Multiply the resistance of that resistor in ohms by the load resistance, also in ohms. Divide the product by the sum of the random resistance and the load resistance. The result is referred to as the "parallel resistance" of the two.
- 4). Find another resistor that has a resistance equal to the parallel resistance you just calculated. This resistor will dissipate the excess voltage as heat, leaving only 6 volts to power your device. If you can't find a resistor of the appropriate value, then recalculate a parallel resistance based on a different randomly chosen voltage.
- 5). Bend the leads on the dissipation resistor downwards and stick it into the circuit board. Turn the soldering iron on and wait for it to heat all the way up. Touch the solder and the tip of the soldering iron to each of the leads of the resistor, where they poke out from the bottom of the circuit board. Hold them there until the solder melts and coats both the lead and the board. Remove the iron and let the solder cool.
- 6). Bend the leads of the resistor you picked randomly down and put it into the circuit board with one lead next to either of the leads of the dissipation resistor. Solder it into the circuit board in the same manner as the other resistor. Connect the adjacent leads of the two resistors with the solder.
- 7). Mark one of the two strands of the adapter's wire with the red marker. Mark the other one with the black marker. Cut the adapter's wire in the middle of the marks, using the wire cutters.
- 8). Remove an inch of insulation from each end of each of the strands, using the wire strippers. Solder the red strand from the plug end to the free lead of the dissipation resistor. Solder the black end to the free lead of the random resistor. Solder the red strand of the other end --- the one with the connector --- to the joint between the resistors. Solder the black strand to the other end of the random resistor.
- 9). Cut notches into tops of opposite sides of the Tupperware container with the knife. Set the circuit into the container, with the wires in the notches. Put the lid on the container, which will protect you from accidental electric shocks while you use the adapted adapter.