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本文向读者介绍一种利用SL 1405电平指示器制作的,给普通便携式(必须是用6伏电压供电)晶体管收音机加装的指示电路,供爱好者制作参考。SL 1405电平指示器是上海半导体器件十六厂生产的音响电路新产品,可与棒状LED发光二极管配合作为收音机、收录机音量指示或信号源交流和直流电平指示,也可用作电池电压检测器。SL1405内部结构如图1所示。SL1405最多可驱动五只LED
This article presents the reader with an instruction circuit built using the SL 1405 Level Indicator for general purpose portable (which must be powered by 6 volts) transistor radios for reference by hobbyists. The SL 1405 Level Indicator is a new audio circuit product from Shanghai Semiconductor Factory No. 16. It can be used with a bar-type LED as a radio, tape recorder volume indicator or signal source AC and DC level indicator. It can also be used as a battery voltage detector . SL1405 internal structure shown in Figure 1. The SL1405 can drive up to five LEDs