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The Tiny and Powerful Frequency Counter

How often you get involved with the frequency counter? Do you know that the frequency counter is designed for radio frequencies (RF) are common and operate on the same principles as lower frequency counters did? Normally, they have more range before they overflow and for very high frequencies, many designs are use a high-speed prescaler to bring the signal frequency down to a point, where normal digital circuitry can be operated. The frequency counter that you’re about to build here is a basic and low cost frequency counter circuit, where it can measure from 16Hz to 100Hz signals with a maximum amplitude of 15V. The sensitivity is very high and the resolution is 0.01Hz. For the input signal, it can be a sine, a square or a triangle waveform! The accuracy of a frequency counter is strongly dependent on the stability of its time base. Those highly accurate circuits are normally used to generate this for instrumentation purposes, and it is usually using a quartz crystal oscillator within a sealed temperature-controlled chamber known as crystal oven or Oven controlled crystal… Continue reading

The Things You Must Know about Frequency Counter!

Most of you here have at least involved yourself with the frequency counter. However, how well do you know about this electronic component? The frequency counter is an electronic component that is used for measuring frequency and it’s usually measure the number of oscillations or pulse per second in a repetitive electronic signal. Most of the frequency counters work by simply using a counter that accumulates the number of events occurring within a specific period of time. After a present period, the value in the counter is transferred to a display and the counter is reset to zero. If the event being measured repeats itself with sufficient stability of frequency and this frequency is considerably lower than the clock oscillator being used, then the resolution of the measurement can be greatly improved by measuring the time required for an entire number of cycles! Furthermore, the accuracy of a frequency counter is strongly dependent on the stability of its timebase. A highly accurate circuit will be used to generate this for instrumentation purposes, and it’s usually using a quartz crystal oscillator… Continue reading

Discover the Mystery of 16F84 PIC Frequency Counter

Do you believe with a measly of $7, and you will get a 16F84 PIC frequency counter? Well, in fact a counter would only cost you less than $2, while the LCD display will cost you a little bit more, which about $5 each. Those simple and user friendly features in the 16F84 PIC frequency counter also elaborated the uniqueness of it as well. There are several sophisticated characteristics in this frequency counter, and you might be having the interest on this project even more. Those features are: A very cute stand alone frequency counter. A comprehensive digital readout function, which you can eventually set the IF offset to any of three combinations i.e.: VFO+IF…. VFO-IF or  IF-VFO with the mode switch. Turn the frequency counter into a Gig region; with just a simple modification, (The additions will include the pre-scaler). A typical 14 MHz count will be around this figure: 14.060.45. Note: Make sure you can mount the frequency counter into a 2N2/20. It is always a fun experience to build a simple and reasonably cheap frequency counter. Continue reading

Be Easy with This Frequency Counter

You must wondered, building a frequency counter is a tough task, but is not as hard as you though. Those materials that needed are: LCD 16 character x two lines TCXO 12.8 MHz (1ppm) PIC 16F84 Some of the features for this frequency counter: It can show the frequency in between 100Hz – 2.5GHz and the voltage (0-510mV) on the LCD display. Well furnished with IF offset-function, and can be applied for the frequency display with the homemade transceiver. Small sized circuit board with 10cm x 4.3 cm. Now, you will learn how to deal with the IF OFFSET. Firstly, when you see the RB3=H, RB5=H and RB0=H, this means it is a normal frequency counter with the power turned on. When the SW for RB7 is pushed, the LCD will show “ADJ”. If you twice the tact SW for RCB is pushed, then the LCD shows “OFF” signal. You will notice the RB5 and RB0 set as “H/L”, only after the power is turned off. In the final step, you now can make the display with IF OFFSET! Continue reading

Powerful but simple 2.5GHz frequency counter

This is amazing frequency counter project. It’s construction is very simple but has a great use. High frequencies are more important for radio amateur who are dealing with radio transmitters and receivers. This frequency counter have ability to subtract the incoming frequency by offset(10.7MHz or 455kHz), so Intermediate Frequency of oscillator could be seen.   As this frequency counter is built under PIC16F870, it can’t measure high frequencies directly especially with high accuracy. Frequency is captured via frequency divider LMX2322 which divides by 64. Frequency counter has optional RS232 output what enables to output frequency value to PC screen or other devices. You can download all project files necessary from original page including two firmware versions 999MHz with 1kHz step and 2.5GHz with 10kHz step. Continue reading