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目前,一般使用电子管制成的双稳态电子计数器,都能成功地使用氖泡作为指示器.但当使用晶体管制作双稳态电子计数器时,由于工作电压太低,无法点燃氖泡,如果直接使用白炽指示灯则又感到推动电流不够,所以一般常用电流表作指示器件.我们知道,一些低频面接合型晶体管,当作开关使用时,其集电极电流可达几十毫安的数量级.而双稳态的计数电路是工作于开关状态的,这就有可能在集电极电路中,接上小电流的白炽灯泡作为指示器.
At present, the bistable electronic counters generally made of electronic tubes can successfully use the neon bulb as an indicator, but when the bistable electronic counter is used as a transistor, the neon bulb can not be ignited because the operating voltage is too low, and if the direct The use of incandescent light bulbs but also to promote the current is not enough, so the commonly used ammeter as a reference device.We know that some low-frequency surface-mount transistors, as the switch when used, the collector current up to the order of tens of milliamps. Steady-state counting circuit is working in the switch state, it is possible in the collector circuit, connected to a small current incandescent bulbs as an indicator.