Open Source Frequency Counter DIY Kit with PIC16F628A and MB506 prescaler 10Hz - 250MHz - YouTube
PIC Frequency Counter: Make One With no External Components!
New PIC16F628A Frequency Counter Firmware with count-up mode - YouTube
LED frequency counter
Frequency Counter( Mine Worked Up to 70MHz) Using PIC 16F628A (with Prototype PCB and Built in Crystal Oscillator) for HAM Shacks : 5 Steps - Instructables
Diy Kits 1hz-50mhz Crystal Oscillator Tester Frequency Counter Tester Meter Case Best Price Durable Diy Led Kit - Integrated Circuits - AliExpress
Exclusive 2.5 GHz Frequency Counter
LCD frequency counter
Frequency counter with PIC and 4- to 5-digit LED display
50 MHz Frequency Counter
Frequency Counter DIY Kit w/LCD 10Hz-250MHz from RH Electronics on Tindie
1Hz-50MHz Crystal Oscillator Frequency Counter Meter 5-Digital LED Display Kit | eBay
MICROCONTROLLERS SECTION <br> FREQUENCY COUNTER By PIC16F628(A)
DIYfan: 100MHz frequency counter
Frequency counter
100MHz frequency counter with PIC16F628A - LCD Display - Electronics-Lab.com