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6. Analogue and digital signals

The two terms represent two highly professional technologies. We can only do a brief introduction. (a) Analogue signals (i)   Characteristics of analogue signals Signals are quantified informations. It can be sound, temperature, velocity, pressure or voltage etc. Analogue signals are those signals that goes with time it carries. It is continuous. The above examples are …

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5. Raw materials and forming

Commonly used raw materials include:  1. Plastics and products,  2. Aluminium and products,  3. Copper/brass and products,  4. Wood and products,  5. Glass and products. Plastics and products: a. Acrylic sheet (North America call it plexiglass), tubing and strip; PVC sheet and tubing. (Fig. 55) Amber acrylic sheet and clear tubing (Fig. 56) PVC sheet …

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4. Adhesive, glue, cement

Adhesive are materials used to join objects together. Various adhesives are available for different purposes. Daily-used adhesives can be classified into two main types: (Fig. 38) (Fig. 39) (Fig. 40) (Fig. 41) Non chemical reaction type Chemical reaction type Type Features and products Type Features and products Let-dry type * with volatile solvent, sets when …

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3. Tools and manipulative skills

Tools needed for the program include: 1. Electric drill 2. Grinder/polisher 3. Pliers and cutter 4. Blind rivet 5. Vise grip 6. Bench vise 7. Soldering iron 8. Hot glue gun 9. Mini-working platform. Electric drill: Available types are (i) bench drill (Fig.5), heavy duty and can undergo long term operation. (ii) Cordless drill (Fig.6), use rechargeable …

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1. Introduction and Program Briefing (Stem1)

STEM stands for the grouping of the first letters of Science, Technology, Engineering and Mathematics. Starting 2016, HK Education Bureau launched a scheme in promoting STEM education in both primary and secondary schools. In short, it aims at strengthening students’ ability to integrate and apply knowledge and skills across different STEM disciplines. Through the promotion …

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