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Designed by Taiwan-based semiconductor company Princeton Technology and discovered by the DIY audio hardware and synth-builder community in the early 2000s, the PT2399 is a self-contained digital delay chip: it has a built-in ADC, DAC, RAM delay line, and a variable internal clock. In plain terms, that means it can create digital delay effects with just a handful of external components. It was cheap, compact, and did the job—perfect for adding slapback echo to karaoke machine

This post was originally published on bom-squad.com in February 22, 2025. While the site is no longer active, the analysis and methodology remain relevant for anyone considering DIY builds. The BOM Squad codebase is still available on GitHub . For anyone interested in modular synthesizers or boutique guitar pedals, cost is a major barrier to entry. People are often shocked at just how high the financial barrier to entry is for modular synthesis. The Make Noise ReSynthesizer,

For Perth-based designer Andrew Fitch, who started building synthesizers in 1998, the Eurorack brand Nonlinearcircuits grew out of a long-running workshop series hosted by West Australian Modular. While Nonlinearcircuits modules are neither the easiest DIY modules to start with nor the most typical, there are several reasons why Nonlinearcircuits is an unusually compelling choice for people who are new to Eurorack or new to DIY electronics (or both). Nonlinearcircuits’ earlie