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Questions and Answers
Questions and Answers
What is the purpose of using a waterproof pen in the printed circuit creation process?
What is the purpose of using a waterproof pen in the printed circuit creation process?
- To make the circuit more visible on the plastic sheet.
- To enhance the conductivity of the circuit.
- To protect the copper layer that will form the circuit diagram during etching. (correct)
- To prevent the plastic sheet from dissolving in the FeCl3 solution.
Microchips, a type of printed circuit, are never inserted into human bodies.
Microchips, a type of printed circuit, are never inserted into human bodies.
False (B)
What is the purpose of etching in the printed circuit creation process?
What is the purpose of etching in the printed circuit creation process?
To remove unwanted copper
Before etching, the 'plastic-Cu' sheet is cleaned using a wet cloth and ______ to remove rust.
Before etching, the 'plastic-Cu' sheet is cleaned using a wet cloth and ______ to remove rust.
Match the steps in creating a printed circuit with their descriptions:
Match the steps in creating a printed circuit with their descriptions:
What ratio of water to FeCl3 is recommended for the etching solution?
What ratio of water to FeCl3 is recommended for the etching solution?
It is safe to touch FeCl3 with bare hands during the etching process.
It is safe to touch FeCl3 with bare hands during the etching process.
What is the first step in converting a theoretical circuit into a practical one?
What is the first step in converting a theoretical circuit into a practical one?
The practical circuit is transferred to the 'plastic-Cu' sheet using ______ paper.
The practical circuit is transferred to the 'plastic-Cu' sheet using ______ paper.
What is the recommended drill size for making pores in the circuit board?
What is the recommended drill size for making pores in the circuit board?
The complexity of printed circuits limits their use to only simple electronic devices.
The complexity of printed circuits limits their use to only simple electronic devices.
What material is the plastic sheet covered with?
What material is the plastic sheet covered with?
The etching solution is a concentrated solution of ______.
The etching solution is a concentrated solution of ______.
Match each safety precaution with its importance:
Match each safety precaution with its importance:
Besides counters, radios, and TVs, which of the following is a common device that utilizes printed circuits?
Besides counters, radios, and TVs, which of the following is a common device that utilizes printed circuits?
Shaking the beaker is not necessary during the etching process.
Shaking the beaker is not necessary during the etching process.
After washing the printed board, what is the next step?
After washing the printed board, what is the next step?
The aim is to design and practice making a ______ circuit.
The aim is to design and practice making a ______ circuit.
What could happen if the copper of the circuit is removed after etching?
What could happen if the copper of the circuit is removed after etching?
Match each aspect of circuit creation with its purpose.
Match each aspect of circuit creation with its purpose.
Questions and Answers
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Flashcards
Flashcards
Printed Circuit
Printed Circuit
A board containing wires and connections built on a small surface.
"Plastic-Cu" Sheet
"Plastic-Cu" Sheet
A plastic sheet covered with copper where circuits are drawn.
Etching process
Etching process
Process of removing unwanted copper from the "plastic-Cu" sheet using FeCl3 solution.
Etching Solution
Etching Solution
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Circuit Transfer
Circuit Transfer
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Pores in circuit
Pores in circuit
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Soldering
Soldering
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Waterproof pen
Waterproof pen
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Safety Precautions
Safety Precautions
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Flashcards
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Study Notes
Study Notes
- The document provides instructions for designing and creating printed circuits.
Aim
- The aim is to learn the design and practical construction of a printed circuit.
Theory
- Printed circuits are common in electronic devices like counters, radios, TVs, and computers.
- Complex circuits can be built on small boards, saving space.
- A circuit is drawn on a plastic sheet coated with copper (Cu).
- The circuit diagram is covered with waterproof pen ink.
- The sheet is dipped in FeCl3 (etching solution) to remove exposed copper.
- The waterproof ink protects the desired circuit pattern.
Applications
- Printed circuits are widely used in electronics.
- Microchips (miniaturized printed circuits) can be implanted in the body to enhance functions like hearing and vision.
Procedure
- After designing a circuit, the process of making the printed circuit begins.
- Clean a "plastic-Cu" sheet with a wet cloth and soap to remove rust.
- Transfer the circuit from paper to the "plastic-Cu" sheet using carbon paper and a suitable pen.
- Redraw the transferred circuit with a waterproof pen.
- Place the sheet in a hot, concentrated FeCl3 solution (3:1 water to FeCl3 ratio) while shaking to etch away unwanted copper.
- Wash and dry the printed board to prepare for soldering.
- Drill small holes (0.6-0.8 mm) at component locations.
- Solder the components and examine the circuit.
Safety and Precautions
- Avoid skin contact with FeCl3.
- Ensure the circuit diagram is accurately transferred to the plastic-Cu sheet before applying the waterproof layer.
- Make sure the waterproof layer fully covers the circuit pattern.
- Leave sufficient copper around drilling positions for soldering.
- Ensure the desired copper circuit remains after etching.
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