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The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and price. It is one of the most popular timing ICs due to its flexibility and price.
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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.
Circuit diagram of a 555 Astable circuit with variable mark-space ratio. The design equations can be found here. Date: 20 June 2006: Source: Own drawing, made in Inkscape 0.43: Author: jjbeard: Permission (Reusing this file) PD
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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 ...
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Hans R. Camenzind (Swiss Standard German: [ˈkaːməntsɪnd]; 1 January 1934 – 8 August 2012 [1]) was an electronics engineer known for designing the 555 timer IC in 1971 under contract to Signetics. [2] He was the inventor on 20 US patents.