A simple tool built from a 7400 NAND gate (or transistor pair). It tells you if a digital pin is High, Low, or Pulsing. Building this will teach you more about digital logic than a semester of theory.
⚠️ Outdated parts – Some ICs (e.g., TDA series, certain CMOS chips) are obsolete. Modern equivalents may need substitution.
⚠️ Scan quality – The PDF is often a scan of an old book; some pages may be fuzzy or skewed.
⚠️ No index/search (in many versions) – You’ll have to flip through or make your own index.
⚠️ Safety – Some circuits involve mains voltage (transformers, power supplies) with minimal isolation guidance. Not for beginners without supervision.
⚠️ Missing updates – No surface-mount or Arduino-era designs.
Yes – legally. If you purchase the Elektor archive or find an official compilation book used online. It remains one of the best "idea books" for analog and digital circuit design. elektor electronics 304 circuits pdf
No – if you are looking for modern SMD (surface-mount) or Arduino/Raspberry Pi projects. This is strictly through-hole, classic electronics.
Final tip: Search for "Elektor 301 Circuits" or "Elektor 305 Circuits" as well. These are similar compilations (common numbers are 301, 304, 305, and 308 circuits). The content overlaps but each has unique projects. A simple tool built from a 7400 NAND
Would you like a sample circuit description from this era (e.g., a classic 555 PWM motor controller or a discrete transistor audio preamp)?
First, let’s clear up the title. The famous book is technically "Elektor 301 Circuits," though later compilations and scanned community versions often get labeled as "304" due to varying editions or pagination errors. Would you like a sample circuit description from this era (e
This PDF is a scan of a hardcover compilation published in the late 1980s/early 1990s. It takes the best reader-submitted and editor-tested projects from Elektor magazine—roughly from 1975 to 1985—and crams them into 200+ pages of pure analog magic.
What’s inside?
In a world of E-Waste, sometimes analog is better. A CMOS 4017 blinking light circuit will last 40 years. A WiFi-enabled smart bulb lasts 2 years before a firmware update bricks it. The "304 circuits" offer permanent, observable, repairable solutions.