Circuit Frequency Meter CA3130
The electronics are still used to use a frequency generator
circuit beuause It is important. And are used a lot in electronic circuits, both sine, square wave and more. In every time related to the frequency. What that we want to know is how much frequency.
For laboratory common standards. We have many tools available to measure frequency. for example, the Oscilloscope and The
Digital frequency counter) But those tools. Usually too expensive. For small laboratories. We Usually want to know how often only approximate.
This cheap frequency meter circuit that we show to you. Suitable for general use in small laboratories. Because cheap, easy to build. And Qualified enough. For applications most of the electronics amateur. It can be shown that the frequency read directly from the meter. Can measure the frequency of 100 Hz (full scale) to 100KHz (full scale). By the characteristics of the waves do not affect the accuracy of the circuit. Even low levels, can be measured to a hundred millivolts. (100mV)
The working principle of the cheap frequency meter is simple. Internal its there is a generates narrow pulses circuit up. By same frequency as the signal to be measured. These pulses will go to make a meter needle swing more or less. By an average of caused by current pulses.
Which the average value will be ratio with amount of pulses that occur in a time period. The signal that is measured has a low frequency and amount of pulse will be few. The current average flow meter is less. But if the signal that is measure has high frequency, number of pulse too much will has the high average current makes the meter needle swing up.