This document describes the construction of small frequency counter with a cheap PIC microcontroller and a few seven-segment LED
![1hz-50 Mhz Crystal Oscillator Frequency Counter Meter Diy Kits Digital Tube Led Display Frequency Measurement Module Board - Replacement Parts - AliExpress 1hz-50 Mhz Crystal Oscillator Frequency Counter Meter Diy Kits Digital Tube Led Display Frequency Measurement Module Board - Replacement Parts - AliExpress](https://ae01.alicdn.com/kf/HTB1jQtPMgTqK1RjSZPhq6xfOFXaQ/1Hz-50-MHz-Crystal-Oscillator-Frequency-Counter-Meter-diy-kits-Digital-Tube-led-Display-Frequency-Measurement.jpg)
1hz-50 Mhz Crystal Oscillator Frequency Counter Meter Diy Kits Digital Tube Led Display Frequency Measurement Module Board - Replacement Parts - AliExpress
Open Electronics on Twitter: "#frequencymeter #diy #kit. It can measure # frequency from 1 Hz to 50MHz. It can check the #crystals #frequency or from an external device. #instrumental #elettronic #elettronics #hobbyelectronics #learnelectronics #
![Economy Frequency Counter & Crystal Tester - John Wiltrout's Blog - Personal Blogs - element14 Community Economy Frequency Counter & Crystal Tester - John Wiltrout's Blog - Personal Blogs - element14 Community](https://community.element14.com/resized-image/__size/620x465/__key/communityserver-blogs-components-weblogfiles/00-00-00-03-15/6443.contentimage_5F00_68889.jpg)