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You can do this either using a Sharpie for a simple circuit or a printed out version from a computer program. Only one of these is needed, so select according to your preference. The schematic should contain a detailed description of all parts, as well as easy to follow connections. If no simulation program is used, assemble and test one or more prototypes of the circuit on a breadboard. Breadboards are very easy to use, and allow one to view the results of a circuit in real time without the need for solder or permanent etches. Circuit boards are about a dollar apiece, and are simply a layer of copper over an insulator. The typical size is usually 3.5 inches (8.9cm) by 5 inches (12.7cm). Drawing is simple; all that is required is an indelible marker, such as a Sharpie. A ruler is also helpful. (Skip this step if you aren't using the computer program and are using the Sharpie method.) Print the design out from the software's print menu. Make sure the print is on a glossy paper (like those in magazines or separate glossy paper). Turn on the electric iron (the same one used for clothes). Carefully cut out the design and position it on the circuit board. Put the hot iron directly on top of the circuit board for about 45 seconds. Take the circuit board (careful it's hot). Wash the paper out such that the black ink is stuck to the copper circuit board. Draw out your circuit on your board with the Sharpie. Note that it's really difficult to draw out a circuit design in real life, unless it's as simple as a led and a battery. Keep in mind that copper cannot be between components, for example, if connecting an LED, there must be a gap in the copper between the positive and negative points of connectivity. Without a gap, the electricity would flow around the LED, as opposed to through it. Remember laws of electricity, all circuits must end at either a negative or ground, or no current will flow. Use thin lines, but lay the ink on thick, it is important that the copper is dissolved before the ink, and that there are no thin patches in the ink exposing copper.
Select your method of imprinting the circuit schematic on the copper board. Draw the circuit schematic on either graph paper or a simulation programs such as MultiSim or Eagle CAD. If a simulation program is being used, test the circuit thoroughly in the simulated environment. Make sure the circuit functions on the breadboard, or in the simulation software. Acquire a circuit board. Apply a printed design. Alternatively: