!new! - Elektor 305 Circuits

In an era before cheap switch-mode power modules from overseas, learning to build a stable, regulated linear power supply was a rite of passage. 305 Circuits covers everything from simple Zener diode regulators to adjustable lab benches with current limiting. 4. Home Automation and Gadgets

Long before "Smart Homes" were a thing, Elektor was teaching readers how to build ultrasonic parking sensors, light-sensitive switches, and electronic combination locks using CMOS logic gates. 5. Radio and HF (High Frequency) elektor 305 circuits

The ubiquitous LM358, TL071, and LM741 are staples of the book. In an era before cheap switch-mode power modules

BC547/557 or 2N3904/3906 usually work as direct replacements. Home Automation and Gadgets Long before "Smart Homes"

The 4000-series CMOS and 74-series TTL chips are still in production and cost pennies. Conclusion

One challenge with older Elektor books is that some components (like specific Siemens or Philips transistors) might be obsolete. However, most designs rely on "jellybean" parts that are still widely available today: