啟動(dòng)電阻starting resistance,通常一端接(整流后�電源的正�,另一端接�(kāi)�(guān)管的基極�
啟動(dòng)電阻starting resistance,通常一端接(整流后)電源的正極,另一端接�(kāi)�(guān)管的基極�
接通電源瞬�,電路尚未起振時(shí),給�(kāi)�(guān)管基極提供一�(gè)偏流,使�(kāi)�(guān)管集電極與開(kāi)�(guān)變壓器初�(jí)�(xiàn)圈流�(guò)一定量的電�,通過(guò)變壓器感�(yīng),反饋線(xiàn)圈中�(chǎn)生了一�(gè)感應(yīng)電壓,又反給�(kāi)�(guān)管基極,使電路�(jìn)入自激振蕩�