Today we had a great class making our own circuit designs with chemical etching which allows for a creative, cheap and effective way of making your own circuits.
1) We started by sketching out our designs on a piece of paper and then transferring them to a copper board with a sharpie pen.
2) Then we let the plates bathe in ferric chloride for about 20 minutes, allowing the chemicals to etch away the copper in a subtractive manufacturing process. The plates are dipped in alcohol to remove the acid. See the image above for the resulting circuit.
3) The final step is to solder the components on the circuit: two resistors, one capacitor, an audio amplifier, audio jack, battery holder and vibrational motor.