Group 4 - MAKE - Philip

DIY Chip

Text and pictures from BonsaiBob

You will need

Material

1. circuit board

2. semiconductor

3. ceramic caacitor

4. insulated wire

5. piezo speaker

6. led light

7. battery 3V/9V and battery connection

Tools

1. UV lamp

2. NaOH = developer, NaSO4 = caustic

3. abrasive paper

4. soldering bolt, solder

5. wire cutter

6. tweezers

Create a printed circuit board

Step 1: Take a photosensitive laminated PCB card and draw or fix the PCB layout on the card. (black pen or printed transparent sheet)

Step 2: Place the board under the UV lamp for about 2 minutes or go outside and expose it to the sun (exposing time outside depends on the intensity of the sun) - Don`t leave it to long exposed!

Step 3: Put it in a bath of acid (NaOH) - Stir every 2-3 minutes!

Step 4: Take it out, clean it with water and put it in a bath of NaSO4 - Stir every 3-5 minutes!

Step 5: Take it out and clean it again with water

The chip is now ready for soldering.

Connect components with the chip

Step 1: Take the abrasive paper and sand the chip.

Step 2: Bend and shorten the edges of the semiconductor

Step 3: Connect the semiconductor onto the chip - !Watch the direction of the semiconductor!

Step 4: Add the other components (ceramic capacitor, led light, speaker, battery connection)

Step 5: Connect the battery and make noise :D

Tipp: For a louder output use a 9V battery or connect the chip to an external speaker.