DK'tronics was founded in April 1981 by David Heelas, an amateur electronics enthusiast. The company started as a one-man project from Heelas's own home, where he designed, manufactured, and distributed his first major commercial success: a 16K memory expansion card for the Sinclair ZX80. The exponential growth in peripheral demand forced the company to structure itself, eventually exceeding 50 employees at its peak, relocating its corporate headquarters to Saffron Walden and opening mass manufacturing plants first in Great Yarmouth and later in larger facilities within Saffron Walden itself.

At the hardware level, its most successful product on a global scale was the range of alternative mechanical keyboards for the Sinclair ZX81 and ZX Spectrum computers. These modules solved the fragility and poor usability of the native rubber keys designed by Rick Dickinson, becoming a standard used by approximately 10% of the entire Spectrum user base at the time.

Within the Amstrad computing ecosystem, DK'tronics played a vital technical role in preserving and enhancing CPC and PCW systems. The company specialized in developing RAM memory expansions (64K modules and upgradeable 256K expansions), which featured removable chips and the "Silicon Disk Operating System" software, frequently mapped into logical ROM banks. These units allowed ultra-fast virtual disks to be emulated in memory (RAM Disk), drastically increasing performance in professional environments under CP/M and advanced database loaders.

In 1985, DK'tronics executed a key corporate milestone by acquiring the hardware company Currah, famous for its sound interfaces and "Microspeech" speech synthesis engineering. This acquisition consolidated its catalog of audio cards and synthesizers based on the General Instrument SPO256-AL2 chip. Despite being primarily remembered as a giant in expansion hardware, the firm boasted a powerful entertainment and utilities software department, highlighting developments by renowned programmers such as Don Priestley and Ed Hickman, alongside holding official British television commercial licenses like the "Minder" series.