: Covers battery chargers and regulated power supply units.
: Pre-amplifiers, signal mixers, and unique filter designs.
Modern electronics rely heavily on programming (Arduino, PIC, ESP32). "305 Circuits" predates this revolution. Many of the logic circuits (counters, sequencers, light chasers) could be built today with a single $2 microcontroller and a few lines of code. Building the discrete logic version from the book is a great learning exercise, but it is often not the most efficient or cost-effective way to solve a problem today. elektor 305 circuits
This section highlights practical everyday solutions. It features twilight switches, automatic porch light timers, infrared remote control extenders, electronic thermostats, and liquid level detectors for water tanks. 5. High-Frequency (RF) and Hobby Radio
| Category | Examples | |----------|----------| | Power supplies | Variable bench supply, battery chargers, voltage doublers | | Audio | Preamps, power amps, tone controls, VU meters | | Digital logic | Counters, timers (555), shift registers, frequency dividers | | Test & measurement | Logic probes, signal injectors, capacitance meters | | Radio/RF | FM bugs, receivers, antenna tuners | | Lighting/LEDs | Chasers, strobes, light dimmers | | Microcontrollers | Basic PIC/AVR projects (older editions) | | Sensors | Temperature, light, IR, touch switches | : Covers battery chargers and regulated power supply units
: Circuits for power supplies, including voltage regulators, converters, and inverters.
Elektor began this series to provide hobbyists and professionals with a concentrated treasure trove of circuit ideas . Each book followed a strict numbering convention (301, 302, 303, etc.), with specifically representing the technical state-of-the-art for the mid-90s. "305 Circuits" predates this revolution
But for the uninitiated—or the younger generation tired of overpriced "STEM kits" that just blink an LED—let me introduce you to a legend: .
: The manual is heavily illustrated with diagrams, flowcharts, and screenshots to minimize human error during construction. Why It Matters Today
: Low-noise designs using classic operational amplifiers like the NE5532.