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Индикатор разряда аккумулятора.
Порог срабатывания звукового сигнала задается при помощи резистора R3

Компоненты для сборки: D1,D2 - 1N4148, R1-82K, R2-2.2K, R3-50K подстроечный, R4-68K, R5-10k,T1-KT3102, TL-431, C1-100n, Buzzer


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