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Frequency Counter Circuits
Frequency Counters:  #s - D      E - Z
Last Updated on:
Friday, August 21, 2015 01:33 PM


Circuits Designed by Dave Johnson, P.E. :
  • 60hz Clock Generator is Line Powered -  This circuit is connected to the 120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides 5000 volts of isolation between the power line and the logic side of the circuit . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/23/99]
  • Count Cars with Laser -  This is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/07/07]
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. . .  

13 GHz Frequency Counter Prescaler -  Here is a fairly simple "divide-by-1000" circuit which was first designed by Zeljko Bozic, S52ZB, in a 2006 issue of VHF Communications Magazine. The idea of this project is to extend the range of older (and cheaper) frequency counters. You can often find 100 MHz frequency counters for as little as $20 at hamfests or eBay, and this simple circuit will extend their range up to at least 13 GHz. This version is based around a Hittite HMC363 divide-by-8 prescaler, a Fujitsu MB506 divide-by-64 prescaler, and a "divide-by-1. 953125" circuit using standard digital logic. The Hittite HMC363 front-end prescaler is good up to 13 GHz or so, and will do 15 GHz if you increase the input RF power a bit and minimize the prescaler's exposure time. . . .  [Green Bay Professional Packet Radio]

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. . . .  [Designer's name not given]

3.5GHZ 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. . . 

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. . . .  

40+ MHz 5 Digit Frequency Counter with an AVR 2313 -  This is another project which fullfills a need. I once built a frequency counter using plain TTL chips. That was long before the CMOS HC versions, even before LS was available. It could measure up to 50 MHz and worked quite okay, but the TTL chips was extremely power hungry. I think there was about 20-25 TTL chips on that monster. . . .  [Jesper Hensen]

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 RMSAT50 MHz. , Input overload protected. . . .  [Designer's name not included]

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. . .  [by Aleksander Stare]

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. . . .  

60hz Clock Generator is Line Powered -  This circuit is connected to the 120vac power line and transfers 60Hz clock pulses to a logic circuit. The optoisolator used provides 5000 volts of isolation between the power line and the logic side of the circuit . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/23/99]

8 Hints for Making Better RF Counter Measurements -  Application Note. . .  [Aligent]

A Little More Serious Frequency Meter  -  Maximum input frequency is specified to be 30 MHz in the multi-chip configuration, and in single-chip configuration, there are both 5 MHz and 10 Mhz versions operating with 10 and 20 MHz crystals, respectively. All versions have 9 1/2 digit resolution. I have  used multi-chip version at 40 Mhz, and depending upon the actual chips you use and your layout, it can work at much higher input frequencies.   The 10 MHz single-chip version using the ATtiny2313 is ideal for use with a X10 or X 100 prescaler. . . .  [From Dick Cappels' project pages]

BCD Frequency Meter -  Here is a simple circuit that precisely measures the frequency in BCD format. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved]

BCD readout frequency counter -  . . .  [Written by Hans Summers]

Count Cars with Laser -  This is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/07/07]

Frequency Counters Circuits:  #s - D      E - Z


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