555 Timer

• Author: Soh Geok Lan, Pang Swee Lee
• Subject: Science and Technology
• Institution Name: University of Hong Kong, Division of I&T Studies
• Collection: Learn Activity (University of Hong Kong)
• Grade Level: Secondary

• Abstract: Many systems involve some type of time keeping. By using 555 integrated circuit in astable state it is easy to design and make accurate and cheap timing circuit (e.g., alarm circuit, counting circuit, sensing circuit, etc.) The working principle of this 555 IC in astable state is supported by the following formulae: Timing period, Timing=(R1+2R2) C/1.44.

• Course Type: Learning Module
• Languages: English
• Material Types: Simulations
• Media Formats: Graphics/Photos, Other
• Technical Requirements: Macromedia

• Conditions of Use: Custom License

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