The micromonolithic circuit was an electronic component created on late 20th century Earth by International Electromatics.

Ashley Chapel designed the circuit. (PROSE: Millennial Rites) It emitted a hypnotic telepathic signal, and was used by Tobias Vaughn and the Cybermen in an attempt to take over the Earth. Thanks to the Second Doctor's recommendation, UNIT used neuristors to resist the effect and stopped the invasion. (TV: The Invasion)

By 2001, the micromonolithic circuit had become obsolete after the development of the Whitefriar Lattice. (PROSE: The Quantum Archangel)

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