Free electronic circuit design and schematic diagram
A schematic diagram of simple tachometer circuit is shown below. Using only a single transistor as the active component, this tachometer would probably be the simplest one. The input of this circuit can be picked up from ignition pickup coil, or other wiring that gives ignition wave-form. This tachometer circuit works for 0 to 6,000 rpm. R3 is used for […]
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We can construct a tachometer using the TC9400 in the F/V mode to convert the frequency information (RPM) into a linearly proportional voltage. Then we can compare this voltage to one of “n” comparators (on this example using 8). The respective LED lights up and will continue to stay lit as long as the voltage exceeds the trip point when […]
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One example of frequency-to-voltage converter application is RPM/Speed indication, converting pulse signal from speed sensor into a linear voltage to drive analog meter. Here is the block diagram of such speed indication system: Since they measure the number of events per time period, flow rates and revolutions per second are nothing more than frequency signals. This flow and revolution will […]
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A modulated current is provided by the integrated rotational speed sensor KMI 15/x. This current signal must be converted to ground referenced voltage signal, matching the logic levels of the processing unit for digital signal processing. This signal conditioning can be done by using this circuit. This circuit consist of protective elements to suppress line conducted interference and low pass […]
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