我在几年前做了一只简单、实用且较准确的转速表。该表是根据德国某种车型转速表简化改进而来的,现介绍给摩友。 有频率转换电路的指针式转速表原理如图1所示。磁电机发出的6～12V的交流电由A端进入,经电阻R限流,稳压管限压,其电压波形变成图2的单向脉冲信号,该信号与曲轴同步。再经频率电流转换电路,把频率信号转换成电流使永磁表头的指针偏转,指示发动机转速。该偏转角度与发动机转速成正比,即是线性的,不需要重新划线,只是把电压符号“V”涂去, A few years ago I made a simple, practical and accurate tachometer. The table is based on a simplified version of a German tachometer improved from the introduction to Mount Friends. A frequency conversion circuit pointer tachometer principle shown in Figure 1. Magnetoelectric issued by the 6 ~ 12V AC from the A-side into the resistance by R limiting, regulator limiting voltage, the voltage waveform into unidirectional pulse signal in Figure 2, the signal synchronized with the crankshaft. And then by the frequency current conversion circuit, the frequency signal is converted to current permanent magnet head pointer deflection, indicating the engine speed. The deflection angle is proportional to the engine speed, that is, linear, do not need to re-line, just the voltage symbol “V” painted,