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Some circuits use older transistors (like the 2N2222 or old germanium diodes). While most have modern equivalents, always check a cross-reference guide if you can't find a specific part.
What is the Master Handbook of 1001 Practical Electronic Circuits? Some circuits use older transistors (like the 2N2222
Transmitters, receivers, and antenna tuners. and antenna tuners. Light dimmers
Light dimmers, timers, and sensor-based triggers. Why Is It Still a Top Resource Today? Some circuits use older transistors (like the 2N2222