Elektor 305 Circuits May 2026

First, let's clear up a common confusion. "Elektor 305" is not a single schematic. It refers to a specific compendium: "305 Circuits" — a series of themed project books published by Elektor in the late 1980s and early 1990s.

However, the most famous and sought-after iteration is the "Elektor 305 IC Circuits" (sometimes labeled as "305 Integrated Circuit Projects"). This book was a follow-up to the massively popular "301 Circuits" and "302 Circuits" volumes. The number "305" simply denoted the total number of distinct, ready-to-build circuit designs contained within its pages. elektor 305 circuits

Why is this collection legendary? Because it captured the golden age of analog and digital IC design. Before Arduino, before Raspberry Pi, the electronics enthusiast survived on a diet of 555 timers, op-amps (741, LM324), CMOS logic (4000 series), and TTL chips (7400 series). The "305 Circuits" book was the ultimate survival guide. First, let's clear up a common confusion

Most circuits in the book use standard, easily sourced components: the 555 timer, the LM741 op-amp, the BC547 transistor, and the CMOS 4000 series logic chips. These parts are dirt cheap and available in every electronics shop in the world. However, the most famous and sought-after iteration is

Flipping through a well-worn copy of 305 Circuits is like time traveling to RadioShack on a Saturday morning. The book is famously divided into color-coded sections (at least in the classic edition):