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Frequency Counter Circuits
Last Updated on:
Wednesday, July 16, 2014 06:35 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1 GHz Frequency Counter -  This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF band…(circuit added 8/06) 
2.5 GHz Frequency counter -  This project describes a very powerful frequency counter. Very simple construction which everyone can build. 6 LED display will present the frequency with 1kHz resolution and RS232 communication to computer is available as option. The software has also been implemented with some smart functions, for calculating frequencies in receivers where IF is 455kHz or 10.7MHz. I present schematic, PCB, components and window software. ….(design added 11/08)
40/400MHZ Frequency Counter -  Frequency counter is a very important test instrument for Radio Amateurs, especially those who wish to develop or test circuits. There are lots of frequency counters in the market but building one was never so easy & exciting with Microprocessors doing lots of work for us. ….(design added 11/08)
40+ MHz 5 Digit Frequency Counter with an AVR 2313 -  (electronic circuit added 7/03)
50 MHz Frequency Counter -  This project is nice and small frequency counter that reads frequency from 1 Hz to 50 MHz that I have modified from original designed by Weeder Technologies . I have designed new PCB to fit with 16X1 LCD and change source code for compatible with new small PCB Specifications, Auto-ranging with floating decimal point., Up to 7 digits displayed on 1X16 LCD., Auto-adjusting gate speed (0.1 sec to 1 sec)., Microcontroller-based circuitry provides for simplicity, ease of assembly, and highly stable readout., Sensitivity approximately 100 mV RMS (100 Hz to 2 MHz), 800 mV RMS @ 50 MHz., Input overload protected. ….(electronic schematic added 11/08)

50 MHz Frequency Counter Voltage Meter & SwR/PWR Indicator -  This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876.....
50MHz Frequency Meter -  This new 50MHz Frequency Meter is autoranging and displays the frequency in either Hz, kHz or MHz.  This makes the unit easy to read, as it automatically selects the correct range for any frequency between 0.1Hz and 50MHz and inserts the decimal point in the correct place for each reading. Note that although we have specified this Frequency Meter at 50MHz maximum, most units will be capable of measuring frequencies somewhat higher than this. In fact, our proto-type meter was capable of making frequency measurements to above 64MHz. ….....
8 Hints for Making Better RF Counter Measurements -  Agilent Application Note  (added 6/06)
AVR Frequency Counter -  How would you like a 40 MHz frequency counter for under $50? What if I told you it also had an 8 digit LCD display, optional offsets for use in a receiver or transceiver, 10 Hz (even 1 Hz!) resolution, and also a six channel digital voltmeter built in? Direct reading with prescalers in the VHF version? Oh, and optional PC telemetry so you can watch the output on a PC, log the results, or graph drift? Well, read on!.... 
Exclusive 2.5 GHz Frequency Counter with Blue 2x16 LCD display -  This project explain a very powerful frequency counter which has many useful software functions. The software can add or subtract 3 different IF frequencies (±455 kHz ,±10.7 MHz and ±21.4 MHz). You have also two level of resolutions, 1kHz and 100Hz.....(schematic added 04/05/06)
Frequency Counter -  Frequency counter with output on 7-segment display  (circuit added 6/07)
Frequency Counter using PIC16C5x -  Microchip Application Note Published 26-Aug-97.....[App Note]
Get six quick tips to make more accurate frequency measurements -  Agilent Application Note.....[App Note]
Making Low frequency measurements with a Frequency Counter -  Agilent Application Note.....[App Note]
MicroController Makes Effective Frequency Counter -  11/23/00 EDN-Design Ideas EDN is migrating links. This link is not verified.  Search the "title" + EDN for new link.
PIC Frequency Counter -  Programmable frequency meter with PIC16F84 and UPB1505 prescaler (circuit added 8/06) 
Simplified Analysis of Phase-Locked Loop Capture & Tracking Range AN 1200-7 -  Agilent Application Note  (added 6/06)
Speed test times by utilizing the built-in features of your frequency counter -  Agilent Application Note.....[App Note]
Transition Counter Gauges Thermal Stability -  01/04/96 EDN-Design Ideas The transition counter of Figure 1 is an easy way to determine if the temperature in a heater is stable. The stable state maximizes the transitions.  This circuit works like a digital filter with controlled frequencies and is simpler than many other analog- and digital-circuit alternatives.The..... [Design Idea by Jose Luis Arce,Tecnosuma Havana, Cuba Jose Luis Arce,Tecnosuma Havana, Cuba]


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