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Acorn Atom
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== Power supply == The Atom takes '''8 V DC (unregulated)''' on a 2.1 mm jack (SK3) and regulates it on the board to '''+5 V''' using two LM340T-5 (7805-type) regulators, IC53 and IC54, each feeding one half of the logic, with a heatsink fitted between them. There is no −5 V rail and no AC inside the machine.<ref name="atomtm" /> The Acorn adaptor is rated 8 V at about 1.5–1.8 A, which is marginal: a fully expanded Atom can draw up to 3 A, and the two regulators run hot.<ref name="wp" /> The board can instead be powered from a 5 V regulated supply by fitting links LK6 and LK7, which join the two power sections and bypass the regulators.<ref name="atomtm" />
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