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Digital-to-analog converter
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===Mechanical=== [[File:IBM Selectric II typewriter.ogv|thumb|IBM Selectric typewriter uses a mechanical digital-to-analog converter to control its typeball.]] A one-bit mechanical actuator assumes two positions: one when on, another when off. The motion of several one-bit actuators can be combined and weighted with a [[whiffletree]] mechanism to produce finer steps. The [[IBM Selectric]] typewriter uses such a system.<ref>{{cite web |author=Brian Brumfield |url=https://www.youtube.com/watch?v=uTjxwVfx8GA | archive-url=https://web.archive.org/web/20151229033401/https://www.youtube.com/watch?v=uTjxwVfx8GA| archive-date=2015-12-29 | url-status=dead|title=Selectric Repair 10-3A Input: Keyboard |date=Sep 2, 2014 |via=YouTube |df=ymd-all}}</ref>
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