The micromonolithic circuit, also known as a Cyber-transmitter unit, was an electronic component created on late 20th century Earth by International Electromatics. It emitted a hypnotic telepathic signal intended to bring humanity under Cyber-Control, alternately refered to as a Cyber-transmission, Cyber-hypnotic force, Cyber-control beam, Cyber-control wave, Cyber-control signal or simply Cyber-signal. (TV: The Invasion)

Ashley Chapel designed the circuit. (PROSE: Millennial Rites) Its signal 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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