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在用DZ664型基地回放仪照相时,经常遇到光盒灯泡有时不亮,有时照了两个段或几个段(即不到一张相纸时)灯泡烧了,突然不亮也不知道。只有一大张相照完、并经洗相后,才知道光盒灯泡工作的情况,影响了回放进度并造成浪费现象。为了解决这个矛盾,我们加装了一个光盒灯泡监视器,可随时告诉操作员光盒灯泡的工作情况(图2)。当光盒灯泡亮时,光电管受光而导通,使Q_2基极电位升高,集电极电位降低,Q_3
In the use of DZ664 base playback device photographic, often encountered light boxes sometimes light bulb, sometimes according to two or several paragraphs (ie, less than a photo paper) light bulb burned suddenly did not light do not know . Only a large photo phase, and after washing the phase, only know the light bulb work situation, affecting the playback progress and cause waste. In order to solve this conflict, we have installed a light box bulb monitor that keeps operators informed about the operation of light boxes (Figure 2). When the light bulb bulb is lit, the photocell is turned on by light and the base potential of Q_2 rises, and the collector potential decreases. Q_3