3. Producing Circuit Boards
Nov 15 / Act B23
Producing Circuit Boards
LEARNING TARGET: I can create a viable circuit board and discuss the environmental impacts of the toxic waste created during the etching process.
CHALLENGE Q
How is a computer circuit board produced?
VOCAB:
next slide

4. chemical reaction - circuit board - Etch – toxic
reactants = new chemical
(product)
plastic "card" with metal parts "welded" to it
"subtracts" unwanted metal leaving circuit (path)
poison

5. DISCUSSION
Conductivity review: will the light bulb light if:
- the two clips touch?
- a piece of plastic is inserted in between the clips?
- a piece of copper-coated plastic is placed between the clips?

6. PROCEDURE AND DATA – day 1
MATERIALS:
PROCEDURE: Read part A only on pg. B and summarize
DATA: 1. Drawings of possible circuit path 2. NOTE time in which copper chloride was added to the circuit boards
POST DISSCUSION Prediction: What types of designs will work to make a successful circuit board??
need a “complete” circuit
(complete path from one side to other side)

7. Not Supposed to Happen!!! What Happened???2 1 3
DAY 2
Not Supposed to Happen!!! What Happened???

8. Review Discussion
Last class we drew a design using a sharpie onto a copper- coated piece of plastic and then placed the plastic into a copper chloride solution. Explain the process: What is the copper-chloride etching solution doing to the copper-coated plastic AND what is the role of the sharpie design. What is the reason behind doing this all in the first place??

9. PROCEDURE AND DATA - day 2
MATERIALS:
PROCEDURE: Read part B on pg. B-56 and summarize
DATA: WS Comparing Materials

10. blue liquid turned green
POST DISCUSSION – waste produced?
What changed about the copper chloride etching solution during the etching process?
What do you think happens when the copper-plated pieces are placed in copper chloride?
What should be done with the used copper chloride etching solution?
blue liquid turned green
parts of the copper disappear
Considered a hazardous/toxic waste

11. ANALYSIS
- Discuss and answer Q 1 & 3 on pg. B- 59
ANS CHALLENGE Q
How is a computer circuit board produced? A:
1st - print a circuit pattern on copper coated plastic plate
2nd – then copper will chemically etch away leaving circuit “path”
HOMEWORK
1. Read Pt B pgs. B56-58
2. Catch up on journal