Калькулятор цветовой маркировки резисторов - https://www.chipdip.ru/calc/resistor

Расчёт транзисторного усилительного каскада по схеме с
общим эмиттером (ОЭ)  - https://vpayaem.ru/inf_transistor_oe.html

Расчёт резисторов для работы транзистора (режим А) - https://www.youtube.com/watch?v=7qYvHVGnGT0

Испытатели транзисторов малой и большой мощности (h21э, Ікво, Ікэк) - https://www.qrz.ru/schemes/contribute/metering/ispytateli_tranzistorov_maloj_i_bol_soj_moqnosti_h21e_kvo_kek.html

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Build a Dual-Meter Transistor Tester - https://www.rfcafe.com/references/popular-electronics/build-dual-meter-transistor-tester-2-1960-popular-electronics.htm

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Simple Amplifier with C945,MJE340, and TIP3055  - https://www.elcircuit.com/2012/04/simple-amplifier-with-c945mje340-and.html

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My 40-Year Love Affair with a Remarkable Amplifier—A Class B Amplifier for Audiophiles  - https://www.allaboutcircuits.com/technical-articles/40-year-love-affair-low-distortion-class-b-audio-amplifier-audiophiles/

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https://keith-snook.info/

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Простой УНЧ по схеме Крылова - https://www.youtube.com/watch?v=C5lIkGpZQ6g&t=73s