Frequency Central is a Coventry, UK-based synthesizer company founded in 2009 by Rick Holt. The brand began with submini tube guitar amplifiers and boutique effects pedals before pivoting to modular synthesizers in 2011, and has since become known among DIY synth builders for affordable, pragmatic Eurorack and MU-format modules — many of them sold both as fully assembled units and as kits.

The catalog spans oscillators, filters, envelope generators, LFOs, sequencers and utility modules, with a particular focus on circuits inspired by classic gear. The System X line draws on the Roland System 100M (with extras like an MC-202-derived FM/PWM LFO on the System X VCO), the Raging Bull is a VCF/VCA design, and the Wave Runner is a multi-waveform sync-able LFO built around Electric Druid's TAPLFO code. The Product module packages the XVCO TWO, Raging Bull 3.0 and System X Envelope behind a single panel as a complete pre-patched synth voice.

Frequency Central expanded into MU/5U format modules in 2015 and later branched into standalone synthesizers. Modules are stocked through specialty retailers including Thonk, Schneidersladen, Perfect Circuit and Exploding Shed, and the brand has a steady following on builder communities like ModWiggler and ModularGrid.

Frequency Central has 2 products cataloged on Equipboard, including Modular Synthesizers.