Classic Frequency Counter 1Hz-50Mhz

Acknowledgement: Credits to Wolfgang Buescher, DL4YHF, for designing this project (based on a work by James Hutchby, MadLab, 1996).

What is it?

This frequency counter kit measures frequencies from 1 Hz to 50 MHz and can also test quartz crystals. An onboard button accesses a menu to zero the scale or add/deduct an offset—ideal for use with a shortwave receiver. The PCB is clearly labelled, making assembly very straightforward even for beginners.

Why you'll love it:

This is a low-component-count, high-value project. It's perfect for the ham shack, electronics lab, or as a teaching tool for learning about frequency measurement and microcontroller-based displays.

Features:

Frequency range: 1 Hz to 50 MHz

Five-digit resolution (displays e.g., x.xxxx kHz, x.xxxx MHz, or xx.xxx MHz)

Automatic range switching with variable gate times

Programmable frequency offset (addition or subtraction)

Optional input signal preamplifier

Very low component count: PIC 16F628, five 7-segment LED displays, 20 MHz crystal, and a few resistors

Optional power-saving mode – automatically turns off the display if frequency hasn't changed significantly within 15 seconds

What's Included

Supplied as a kit. You need to solder components onto the board yourself. Battery, enclosure, and test leads not included.