Stem1

A. Suppliers of electronic components and tools Region Name of shop Address Tel /e-mail/website Sham Shui Po Welfare Electronic Component Ltd. 201 Apliu St. 3182-0888cs@wecl.com.hk www.wecl.com.hk Remarks Site photo HK’s most comprehensive retailer of all kinds of electronic components, notably various IC chip series. Price and availabilities are very reasonable. Dealer of popular brands of …

15. Appendix (1) : Hong Kong major hot spots for purchasing electronic components, tools and raw materials (as of year 2022) Read More »

A. Suppliers of electronic components and tools Region Name of shop Address Tel /e-mail/website Sham Shui Po Welfare Electronic Component Ltd. 201 Apliu St. 3182-0888cs@wecl.com.hk www.wecl.com.hk Remarks Site photo HK’s most comprehensive retailer of all kinds of electronic components, notably various IC chip series. Price and availabilities are very reasonable. Dealer of popular brands of …

15. Appendix (1) : Hong Kong major hot spots for purchasing electronic components, tools and raw materials (as of year 2022) Read More »

Magnetic stirrer Magnetic stirrer is very helpful when the stirring area is packed with instruments like pH electrodes, conductivity probes etc which makes stirring by glass rod unable to work. Magnetic stirrer is also necessary for chemical reactions which require long period of stirring. A lot of magnetic stirrers are equipped with hot plates (Fig. …

14. Present oneself a souvenir – a mini magnetic stirrer Read More »

(All information of the topic was obtained from the internet) 13.1 Limitation of traditional electronic communication and computation Designs of electronic computation is based on the mathematical treatment of binary Boolean algebra and electronic logical gates, operating with (0 1) binary bit coding programming (software) and decoding devices (hardware). A high voltage of 5V is …

13. An introduction to foreseeable electronic computation vs quantum communication and computation   Read More »

(i)  Models of handsets Development of wireless handsets from 1G to 2G were based on the concept of “connecting people”, delivering both voice and text point-to-point communications. Employed technology standard of GSM was incapable of catering broadband speed requirement of data transmission, Hence, phones of that time could not connect to the internet and use …

12. Smartphones and the Web Read More »

11.1 Analogue and digital landline communication Transmission of line communication, or cable networking, is conducting electrical signals through solid state media. Currently some places still use analogue phone communication that employs copper cable transmitting modulated sound signals (Fig. 287). Microphone changes voice to electrical analogue signals and transmitted as amplitude modulated wave by using carrier …

11.  Landline (copper cable or optical fibre cable) communication and wireless (1G to 6G) communication   Read More »

From small appliances like toys, credit card readers, keyboards, colour TVs, refrigerators, air-conditioners, microwave ovens to large machines such as cars, industrial auto systems, outdoor advertisement displays, robots and even military missiles, they are not operated by formal OS-based computers. Instead, single chip microcomputers or controllers are used. Single chip microcontroller is an important branch …

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9.1 Boolean algebra, logic gate IC, and digital electronic techniques Op-Amp ICs are electronic devices designed for processing analogue signals to perform mathematical functions like multiplications, differentiations, integrations, oscillations etc. Logic gate ICs, on the other hand, are digital electronic devices for processing (0 1) binary bits to perform digital computations based on binary Boolean …

9. STEM and fundamentals of digital electronics Read More »

8.1 Understand usage and command sketching of basic electronic components and circuits Name Symbol Function Remark Connecting wire Electric wire For electrical conduction, usaully copper wire enclosed with plastics. Wires connected Circuits thro and connected Wires not connected Circuits not connected Switch SPST toggle switch (OFF), circuit not connected, (ON), circuit connected 1P2T toggle switch …

8. Interpretation of electronic circuits Read More »

Commonly used electronic components in instrumental assembly include:  a. resistor (fixed or variable), b. light dependent resistor (LDR), c. breadboard, d. universal/printed circuit board, e. light emitting diode (LED), f. Integrated Circuit (IC), g. capacitor, h. inductor, i. transformer, j. rectifier, k. zener diode, l. switch, m. relay, n. plug and socket。   Advised to …

7. An introduction to commonly used electronic components Read More »