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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).
The stepped-tone generator [49] is a circuit that utilizes a 556 dual timer IC. The controls are two potentiometers. Mims titled the circuit "Sound Synthesizer" in 1982 [50] then later called "Stepped-Tone Generator". The circuit creates sounds similar to a plucked violin. [49]
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.
In the release dates, the 555 was released also in a 14 pin DIP. The article calls this a 556, which came later. 2A00:23C7:F583:3501:1B6E:666B:EEA1:CA64 16:42, 27 February 2024 (UTC) Please post a link to proof to back up this claim. • Sbmeirow • Talk • 06:41, 28 February 2024 (UTC)
Some manufacturers released some 4000-series equivalent CMOS circuits with a 74 prefix, for example, the 74HC4066 [2] was a replacement for the 4066 with slightly different electrical characteristics (different power-supply voltage ratings, higher frequency capabilities, lower "on" resistances in analog switches, etc.).
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 ...