Note to the modern builder: The assumes you can source components that are becoming obsolete.
Many of these circuits use "tricks" to minimize component counts. Studying how an engineer used a single hex-inverter chip to create a complex oscillator is a great way to improve your own design logic.
One of the joys of this collection is retrofitting. For example, a "Precision Time Delay with the 555" uses a 10uF capacitor and a 1M resistor. Today, you can use a ceramic capacitor and a metal-film resistor for better stability.
Most circuits in the book use standard, easily sourced components: the , 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.
One thing collectors obsess over is the . In the Elektor 305 book, the PCBs are drawn from the component side (mirrored view) with tracks following a strict 90-degree and 45-degree angle rule. The ground fills are minimal. Replicating this "retro" design style is a niche hobby in itself.
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