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In 1972, Signetics originally released the 555 timer in DIP-8 and TO5-8 metal can packages, and the 556 timer was released in a DIP-14 package. [ 4 ] In 2006, the dual 556 timer was available in through-hole packages as DIP-14 (2.54 mm pitch), [ 21 ] and surface-mount packages as SO-14 (1.27 mm pitch) and SSOP-14 (0.65 mm pitch).
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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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: 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: Pinout diagram of the 555 timer IC. Inputs are green, outputs are blue and power pins are red. Date: 23 June 2009: Source: Own work: Author: Inductiveload ...
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.
Block diagram of a Schmitt trigger circuit. It is a system with positive feedback in which the output signal fed back into the input causes the amplifier A to switch rapidly from one saturated state to the other when the input crosses a threshold. A > 1 is the amplifier gain B < 1 is the feedback transfer function