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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.
Circuit diagram of a standard 555 Astable circuit. The design equations can be found here. Date: 20 June 2006: Source: ... Timer 555; Usage on pt.wikipedia.org CI 555;
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Date/Time Thumbnail Dimensions User Comment; current: 01:32, 23 June 2009: 275 × 250 (41 KB): Inductiveload {{Information |Description={{en|1=Diagram of a monostable circuit made using the en:555 timer IC.
English: Diagram of a bistable circuit made using the 555 timer IC.A low pulse on the trigger line flips to set, and a low pulse on reset flops to reset.
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: Pinout diagram of the 555 timer IC. Inputs are green, outputs are blue and power pins are red. Inputs are green, outputs are blue and power pins are red. Date
The open collector transistor can be rated to withstand a higher voltage than the chip supply voltage. This technique is commonly used by logic circuits operating at 5 V or lower to drive higher voltage devices such as electric motors, LEDs in series, [8] 12 V relays, 50 V vacuum fluorescent displays, or Nixie tubes requiring more than 100 V.