Understand Frequency Counters by making your own

Although many people use test equipment regularly, they may not have a full understanding of what's actually going on to get them their data. That's why we like this project by Wilko Lunenburg who demonstrates the operation of a frequency counter by documenting making their own.

Wilko's version uses reciprocal frequency counting, which is different to the usual method of counting pulses within a fixed period of time. The differences between the two are also explained in great detail, and the resulting counter works very well:

For complete information, schematics and code - visit the project Instructable page.