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电磁计数器是利用电脉冲驱动的计数工具。它能用十进制数字来显示电脉冲的个数。据实验,用方波驱动的DJS-5型电磁计数器可以在960次/分的频率下工作。只要设计一个相应工频的方波脉冲信号源,若这个脉冲信号既是稳定的、又是可以控制的,那么这个脉冲信号经驱动电路加到电磁计数器衔铁线圈上就能够使电磁计数器作为计时器使用。本简易电子计时器正是按照这样的设想来工作的。图一所示为简易电子计时器的电路原理图。
Electromagnetic counter is the use of electric pulse-driven counting tool. It can display the number of electrical pulses in decimal numbers. According to the experiment, DJS-5 type electromagnetic counter driven by a square wave can work at the frequency of 960 times / min. As long as the design of a corresponding frequency of the square wave pulse signal source, if the pulse signal is both stable and can be controlled, then the pulse signal through the drive circuit is added to the electromagnetic counter armature coil can make the electromagnetic counter as a timer . This simple electronic timer is working according to this assumption. Figure 1 shows the circuit diagram of simple electronic timer.