presetting circuit
... preset-time counting (在)给定时间(内)计数 presetting circuit 预调整电路 presetting period 初凝时期 ...
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可控硅预稳压电路降低串联稳压电路中的调整管管耗，使调整管两端的电压差始终是设定值。
Regulated power supply by SCR can reduce the consume energy of transistor and make the voltage between C and E of transistor keep invariable.
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