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The 555 IC has the following operating modes: Astable (free-running) mode – The 555 operates as an electronic oscillator. Applications include: Light emitting diode and lamp flashers, pulse generation, pulse-width modulation (PWM), logic clocks, tone generation, security alarms, pulse-position modulation, etc.
Timer 555; Usage on pt.wikipedia.org CI 555; Usage on uk.wikipedia.org NE555; Usage on vi.wikibooks.org Thảo luận:Điện tử/Bộ tạo sóng; Sách điện/Bộ phận điện; Sách điện tử/Linh kiện điện tử/Con chip IC 555; Công thức điện tử; Sách điện tử/Mạch điện điện tử/Mạch điện IC 555
A similar relaxation oscillator can be built with a 555 timer IC (acting in astable mode) that takes the place of the neon bulb above. That is, when a chosen capacitor is charged to a design value, (e.g., 2/3 of the power supply voltage) comparators within the 555 timer flip a transistor switch that gradually discharges that capacitor through a ...
Date/Time Thumbnail Dimensions User Comment; current: 21:26, 20 June 2006: 275 × 313 (37 KB): Jjbeard {{Information |Description=Circuit diagram of a 555 Astable circuit with variable mark-space ratio.
English: Plot of two voltages from File:555_Astable_Diagram.svg, in which a 555 timer is set up to produce a square wave output (an astable circuit). Date 27 September 2007 original, vectorised 2019-12-11.
For example, the positive (and/or negative) pulse width from a 555 Timer IC in monostable or astable mode represents the time it takes to charge (and/or discharge) its capacitor from 1 ⁄ 3 V supply to 2 ⁄ 3 V supply. By sending this pulse into a microcontroller with an accurate clock, the duration of the pulse can be measured and converted ...