Club of the Knobs (CoTK) is a modular synthesizer manufacturer based in Lisbon, Portugal, founded by German-born Gerd Peun (known as Kazike) together with his wife Raj. The company specializes in 100% analog modules built in the MU (Moog Unit) / Dotcom format, meticulously recreating the look and feel of the vintage Moog modular synthesizers that pioneered the format.

CoTK began by producing faithful Moog-style clones and has since expanded into a catalog of more than 80 modules, including original designs alongside re-engineered classics. The lineup features modular systems modeled on the Moog 15, 35, and 55 cabinets, transportable P-series cases, custom configurations, and dedicated controllers such as the C 952 ribbon controller and the Polyklavier polyphonic keyboard. Specialty modules include the Vocoding System and the Euklidian Bi-Gate Sequencer.

Production is handled by a small international team: metalwork is overseen by Nicola Santi in Italy, wooden cabinets are crafted by Jean-Marc Declercle in Lisbon, PCB assembly is led by Ruben da Costa in Portugal, and chip programming is handled by Georg Mahr in Germany. The brand is known among modular enthusiasts for its emphasis on craftsmanship, hand-built construction, and the visual and tactile presence of large-format analog synthesis.

Club of the Knobs has 2 products cataloged on Equipboard, including Modular Synthesizers. Their gear is featured by 3 artists, with the strongest followings in Electronic, Stage & Screen, and Pop. Notable users include Matador, Junkie XL, and Firechild.