File:Original Abraham-Bloch multivibrator circuit.png
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editDescriptionOriginal Abraham-Bloch multivibrator circuit.png |
English: The first astable multivibrator circuit, invented by French engineers Henri Abraham and Eugene Bloch, from their 1919 paper. The Abraham-Bloch multivibrator, built with triode vacuum tubes, was the first relaxation oscillator circuit, and the predecessor of the Eccles-Jordan flip-flop widely used in modern digital logic. Abraham called the cross coupled-oscillator a multivibrateur because its square-wave output was rich in harmonic frequencies, unlike the existing sine wave oscillators. The text gives the component values as R1 = R2 = 50 kΩ, r1 = r2 = 75 kΩ, C1 and C2 are 8 pF adjustables. The circuit could oscillate at frequencies up to 50 kHz. |
Date | |
Source | Retrieved February 4, 2014 from Richard Glazebrook 1922 A Dictionary of Applied Physics, Vol. 2: Electricity, MacMillan and Co., New York, p. 633, fig. 8 on Google Books. Credited in source to to H. Abraham, Comptes Rendus, Vol. 168, 1919, p. 1105 |
Author | Henri Abraham |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:54, 13 July 2019 | ![]() | 1,360 × 952 (195 KB) | Dicklyon (talk | contribs) | better grab from the same source, cleaned up a little |
08:32, 6 February 2014 | ![]() | 382 × 241 (5 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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Image width | 1,360 px |
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Image height | 952 px |
Date and time of digitizing | 02:48, 13 July 2019 |
File change date and time | 02:52, 13 July 2019 |
Date metadata was last modified | 02:52, 13 July 2019 |
Unique ID of original document | xmp.did:3855ee73-8551-44e6-8364-5abf4283ed72 |
Horizontal resolution | 56.69 dpc |
Vertical resolution | 56.69 dpc |