How often you get involved with the frequency counter? Do you know that the frequency counter is designed for radio frequencies (RF) are common and operate on the same principles as lower frequency counters did?
Normally, they have more range before they overflow and for very high frequencies, many designs are use a high-speed prescaler to bring the signal frequency down to a point, where normal digital circuitry can be operated.
The frequency counter that you’re about to build here is a basic and low cost frequency counter circuit, where it can measure from 16Hz to 100Hz signals with a maximum amplitude of 15V. The sensitivity is very high and the resolution is 0.01Hz. For the input signal, it can be a sine, a square or a triangle waveform!
The accuracy of a frequency counter is strongly dependent on the stability of its time base. Those highly accurate circuits are normally used to generate this for instrumentation purposes, and it is usually using a quartz crystal oscillator within a sealed temperature-controlled chamber known as crystal oven or Oven controlled crystal oscillator.
When the frequency doesn’t need to be known to such a high degree of accuracy, simpler oscillator can be used for the purpose. Furthermore, it is also possible to measure frequency by using the same techniques in software in an embedded system.